TECHNICAL BULLETIN
Excellence Without Compromise
EWC
R
TB 117
CONTROLS INC.
Models EWC STMS 2A & 3A
Leave this bulletin on the job site
The STMS control panel will interface with single
stage or two stage gas or oil fired furnaces and
boilers, with electric air conditioning systems, or
two stage heat, single stage cool heat pumps.
ZONE 3
MOTOR SW3OPEN
EWC-STMS-2A Control Panel
K5
Z5
Z6
C5
C6
K6
EWC-STMS-3A Control Panel
K3
Z3
D15
C3
D16
ZONE 3
T'STAT
R3
C
W2
Y2
Y1
W1
R
D18
CLOSED
D14
D17
K6
D13
K5
Z6
Z5
C6
ZONE 2
MOTOR
M6
M4
M2
M1
SW2
OPEN
K2
D7
D11
Z2
D12
D8
D9
Z1
D3
D4
C1
ZONE 1
MOTOR
M6
M4
M2
M1
SW1
OPEN
K4
CLOSED
R2
D2
D6
D1
D5
K7
Z7
C7
CB1
Z8
D22
C8
D21
D19
D20
1
D32
SYSTEM
K11
B
O
HP
E
W2
W1
Y2
Y1
GC
R
GHC
Z11
D31
C11
D33
C
W1
Y1
HP
Y2
W2
R
O
E
G
D34
D30
J1
K10
Z10
D29
C10
D27
D28
D26
K9
Z9
C9
D25
D23
D24
D11
D7
K2
CLOSED
K1
CAUTION
PLEASE read all
instructions carefully
before starting the
installation procedures.
DO NOT connect to
voltages above 30 VAC.
ADDITIONAL {
ZONE PANEL
W2
Y2
O
R
C
+
-
Z1
C1
D3
D4
R1
D6
D5
CLOSED
D2
Z7
D1
C7
K7
ZONE 1 T-STAT
C
W1
Y1
HP
Y2
W2
R
O
E
G
K4
Z4
24V
T'FORMER
C4
D22
D21
CB1
2
C
W2
Y2
Y1
W1
R
D10
D9
D8
M6
M4
M2
M1
ZONE 2
T'STAT
R2
D12
Z2
C2
ZONE 1 SW1
MOTOR
OPEN
ZONE 1 T-STAT
Z4
K8
M6
M4
M2
M1
R1
C4
24V
T'FORMER
2
C
W2
Y2
Y1
W1
R
D10
C5
ZONE 2
MOTOR SW2OPEN
ZONE 2
T'STAT
C2
CLOSED
K1
This technical bulletin contains information
and wiring diagrams for the ULTRA ZONE,
STMS-2A and 3A control panels. Please read
and familiarize yourself with the proper wiring
diagrams before you start the installation. We
have compiled these diagrams based on the
most frequently asked questions regarding
the wiring of these panels. The STMS panel
will interface with many HVAC systems. If
your particular application does not match
any of the supplied diagrams, call the
technical support hot line. If the system does
not operate properly or you experience
trouble during the installation, check this
bulletin against the field wiring for shorts or
mis-wiring. If the problem cannot be
resolved, then call the technical support hot
line.
M6
M4
M2
M1
K8
D19
Z8
D20
1
C8
SYSTEM
B
O
HP
E
W2
W1
Y2
Y1
GC
R
GHC
D32
D31
K11
Z11
D33
C11
D34
D30
J1
K10
Z10
C10
D29
D27
D28
D26
K9
Z9
C9
D25
D23
D24
CAUTION
PLEASE read all
instructions carefully
before starting the
installation procedures.
DO NOT connect to
voltages above 30 VAC.
ADDITIONAL {
ZONE PANEL
W2
Y2
O
R
C
+
-
R
R
CONTROLS INC.
Englishtown, NJ
CONTROLS INC.
Englishtown, NJ
CONTROL SYSTEM
EWC-STMS-2A
CONTROL SYSTEM
EWC-STMS-3A
Warning: Control panel does not have any built in time delays.
The HVAC system must have its own or, installer provided time delay
relays to prevent system short cycling.
TABLE OF CONTENTS
PAGE
The heating and cooling system changeover,
1
Introduction and Specifications
emergency heat, and fan operations are
2
Two stage systems
controlled by the subbase on the zone 1
3
Heat pump systems
thermostat. When using thermostats with
manual changeover switches
4
Two stage wiring diagrams
(HEAT-OFF-COOL) on zones other than zone 1,
5 & 6 Heat pump wiring diagrams
make sure all zones are in the same mode at
7
Expansion panel wiring
all times. If zone 1 system mode is changed,
then the other zones should be changed as
8 & 9 Transformer and damper wiring
well, for proper operation. Auto changeover
10 & 11 Service notes
thermostats on other zones will eliminate the
12 Diagram overview
need for manual changeover. Most battery
powered or AC powered thermostats can be
SPECIFICATIONS
used and wired directly to the panel. For
even greater comfort and energy savings,
Power Requirements: 24volt 60 Hz 40VA
setback thermostats can be wired to any or all Wiring Connections: Screw terminal blocks for thermostat gauge wire.
zones.
Mounting: Mounts with 4 screws and mollies (included).
Panel Dimensions: Length: 11 5/8" (295mm); Width: 9" (229mm);
Depth: 1 1/4" (32mm).
Warning: These panels are designed for use with 24 volts AC power. Do not use any other voltage! Use caution to
avoid electric shock or equipment damage. All wiring should be done in accordance with local and national codes.
P/N 090375A0117 REV E 16 APR 2001
.
Copyright EWC Controls C 1999-2003 All Rights Reserved
EWC Controls Inc. 385 Highway 33
. Englishtown, NJ 07726 . 800-526-4048 . 732-446-3110 . FAX
732-446-5362
TWO STAGE SYSTEMS
OPERATION
WIRING
CONVENTIONAL TWO STAGE SYSTEM
SYSTEM
The mode of operation is determined by the position
of the system selector switch on the subbase of the
zone 1 thermostat. Switching subbases are not
required on the other zones.
Wiring a 2 stage HVAC system to the EWC STMS control
panel is similar to wiring directly to a thermostat subbase.
The following terminals are on the system terminal block.
R - To hot side of system transformer.
B - Unused.
O - Unused.
Y1/Y2 - To compressor relays first and second stage.
W1/W2 - To heat relays first and second stage.
E - Unused.
GC - To fan relay if cycled in cool mode only.
GHC- To fan relay if cycled in cool and heat mode.
HP- Unused.
HEAT MODE
The panel will be in the heat mode when the
zone 1 thermostat subbase is in either the
"HEAT" position or the "OFF" position. This allows
any zone to call for heat, except zone 1 when its
subbase is in the off position. When a zone calls for heat,
the panel closes the circuit from the system "R" terminal
to the system "W1" terminal, energizing the first stage
heat relay. Also in the heat mode, system terminal "R"
is in constant make to system "B" terminal. If any zone
is equipped with a 2 stage thermostat, when the
thermostat makes on the second stage, the panel
will also make the system terminal "R" to system "W2"
to energize the second stage heat relay.
COOL MODE
The panel is in the cool mode when the zone 1
thermostat subbase is switched to the cool
position. In this mode any zone can call for cooling.
When a zone calls for cooling, the panel closes the
circuit from the system "R" terminal to the system "Y1"
and "G" terminals, energizing the first stage cool relay,
and the fan relay. Also in the cool mode, the system
"R" terminal is in constant make to the system
"O" terminal. If any zone is equipped with a 2 stage
thermostat, when the thermostat makes on the second
stage, the panel will also make system "R" terminal
to the system "Y2" terminal, to energize the second
stage compressor relay.
OFF MODE
There is no true off mode. When the zone 1
thermostat is in the off position, the remaining
zones can still call for heat. Each zone thermostat
must have its own switching subbase, with "OFF"
position, in order to turn off each individual zone.
FAN
Manual control or continuous operation of the fan
is controlled by the position of the fan switch on the
zone 1 thermostat subbase only. The remaining
zones are not capable of individual fan control. The
STMS system terminal block provides two fan control
connections, "GC" and "GHC". The "GC" terminal will
energize the fan relay in the cool mode only. The
"GHC" terminal will energize the fan relay in both
heating and cooling modes. Used for electric heat
and some hydronic heat applications.
2
ZONE DAMPER MOTORS
Use 3 conductor wire from each zone damper motor
terminal to the corresponding terminals on the STMS or STEX
control panels. Consult wiring diagrams for damper types.
NOTE: When operating more than one damper motor per
zone, consult specific wiring diagrams.
When any zone is calling, that damper will be in the open
position. Any zone not calling will be in the closed position.
When all zones are satisfied, the position of the damper is
controlled by the "OPEN/CLOSED" switches on the panel.
OPEN POSITION - The damper will drive open when all zones
are satisfied.
CLOSED POSITION - The damper will drive closed when all
zones are satisfied except with SMD,
BMD, IMD dampers, the last zone to satisfy will always remain
open regardless of switch position.
THERMOSTATS
ZONE 1
Thermostat wiring depends on the type of thermostats used.
The following is a description and the requirements of the
terminals on the zone 1 thermostat terminal block.
R- Hot side of 24 volts to thermostat.
C- Common side of 24 volts to thermostat. If needed.
Y1- Must be made to "R" on a call for 1st stage cooling.
Y2- Must be made to "R" on a call for 2nd stage cooling.
HP- Unused in two stage operation.
O- Must be made to "R" continuously when system switch is in
the cool position.
E- Unused in two stage operation.
W1- Must be made to "R" on a call for 1st stage heating.
W2- Must be made to "R" on a call for 2nd stage heating.
G- Must be made continuously when fan switch is in the "ON"
position.
ZONE 2/3
Zone 2/3 thermostat is a simple single stage heat-cool
thermostat or a 2 stage heat and 2 stage cool depending
on requirements of a particular zone. The following is a
description and the requirements of the terminals on the
zone 2/3 thermostat
R- High side of 24 Volts to thermostat.
C- Low side of 24 Volts to thermostat. If needed
Y1- Must be made to "R" on a call for cooling.
Y2- Must be made to Y1 on a call for second stage cooling.
W1- Must be made to "R" on a call for heat.
W2- Must be made to "W1" on a call for second stage heat.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-635-8646
E-Mail- [email protected]
HEAT PUMP SYSTEM
OPERATION
HEAT PUMP SYSTEM
The mode of operation of the heat pump is
determined by the position of the system
selector switch on the subbase of the zone 1
thermostat. Switching subbases are not
required on the other zones.
HEAT MODE
The panel will be in the heat mode when the
zone 1 thermostat subbase is in either the
"HEAT" position or the "OFF" position.This allows
any zone to call for heat, except zone 1 when its
subbase is in off position. When a zone calls for heat,
the panel closes the circuit from the system "R" terminal
to the system "HP", and "G" terminals, turning on the
compressor and fan. Also in the heat mode, system
terminal "R" is in constant make to system "B" terminal.
Terminal "B" is used to operate a reversing valve
that is energized in the heat mode. If any zone is
equipped with a 2 stage thermostat, when the
thermostat makes on the second stage, the panel
will also make system "HP" to system "W2" to
energize the second stage or auxilliary heat relay.
EMERGENCY HEAT MODE
This mode is activated by putting the zone 1
thermostat subbase in the emergency heat
position. In this mode the compressor is disabled.
When a zone calls for heat, the circuit is closed
from the system "R" terminal to the system
"E" and "G" terminals. The "E" terminal is used
to energize a separate emergency or backup
heat relay. If any zone is equipped with a 2 stage
thermostat, when the thermostat makes on the
second stage, the panel will also make system
"E" terminal to system "W2" terminal. It may be
the same heat source as the emergency heat.
COOL MODE
The panel is in the cool mode when the zone 1
thermostat subbase is switched to the cool
position. In this mode any zone can call for cooling.
When a zone calls for cooling, the panel closes the
circuit from the system "R" terminal to the system
"HP", and "G" terminals, turning on the compressor
and the fan. Also in the cool mode, the system "R"
terminal is in constant make to the to the system "O"
terminal. Terminal "O" is used to operate a reversing
valve that is energized in the cool mode.
OFF MODE
There is no true off mode. When the zone 1
thermostat is in the off position, the remaining
zones can still call for heat. Each zone thermostat
must have its own switching subbase, with "OFF"
position, in order to turn off each individual zone.
FAN
The operation of the fan is controlled by the position of
the fan switch on the zone 1 thermostat subbase only.
The remaining zones are not capable of individual
fan control. The STMS system terminal block provides
two fan control connections, "GC" and "GHC". The "GC"
terminal will energize the fan relay in the cool mode
only. The "GHC" terminal will energize the fan relay
in both heating and cooling modes. The Heat Pump fan
relay should be connected to GHC terminal.
WIRING
HEAT PUMP
Wiring the heat pump to the EWC STMS control
panel is similar to wiring the heat pump to a
thermostat subbase. The following terminals are
on the system terminal block.
R - To hot side of heat pump system transformer.
B - To reversing valve if energized in heat mode.
O - To reversing valve if energized in cool mode.
Y1/Y2 - Unused.
W2 - 2 second stage heat relay.
E - To emergency heat or backup heat relay.
GC - Unused.
GHC- To fan relay, cycled in cool and heat mode.
HP- To compressor relay in heat pump mode.
W1- Unused.
ZONE DAMPER MOTORS
Use 3 conductor wire from each zone damper motor
terminal to the corresponding terminals on the STMS or STEX
control panels. Consult wiring diagrams for damper types.
NOTE: When operating more than one damper motor per
zone, consult specific wiring diagrams.
When any zone is calling, that damper will be in the open
.
position. Any zone
not calling will be in the closed position.
When all zones are satisfied, the position of the damper is
controlled by the "OPEN/CLOSED" switches.
OPEN POSITION - The damper will drive open when all zones
are satisfied.
CLOSED POSITION - The damper will drive closed when all
zones are satisfied except with SMD,
BMD, IMD dampers, the last zone to satisfy will always remain
open regardless of switch position.
THERMOSTATS
ZONE 1
Thermostat wiring depends on the type of thermostats used.
The following is a description and the requirements of the
terminals on the zone 1 thermostat terminal block.
R- Hot side of 24 volts to thermostat.
C- Common side of 24 volts to thermostat. If needed.
HP- Must be made to "R" on a call for heat or cool.
O- Must be made to "R" continuously when system switch is in
the cool position.
E- Must be made to "R" continuously when system switch is in
emergency heat position.
W2- Must be made to "R" on a call for second stage heat
when system switch is in either heat or emergency heat.
G- Must be made continuously when fan switch is in the "ON"
position.
ZONE 2/3
Zone 2/3 thermostat is a simple single stage heat-cool
thermostat or a 2 stage heat and 1 stage cool depending
on requirements of a particular zone. The following is a
description and the requirements of the terminals on the
zone 2/3 thermostat
R- High side of 24 Volts to thermostat.
C- Low side of 24 Volts to thermostat. If needed
Y1- Must be made to "R" on a call for cooling.
W1- Must be made to "R" on a call for heat.
W2- Must be made to "W1" on a call for second stage heat.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-635-8646
E-Mail- [email protected]
3
2 Stage Heat/Cool Thermostat and System Wiring
WIRING DIAGRAM #1
Two stage heating and cooling
using EWT-2S & EWT-2SM
Thermostats
On STMS-3A Panel Wire
Zone 3 same as Zone 2
WIRING DIAGRAM #2
EWT-2S
ZONE 2 THERMOSTAT
HEAT
. . . .
50
60
70
. . . .
80
50
60
70
COOL
80
50 60 70 80
. . . .
Model T8624
ZONE THERMOSTAT
W2
Y2
Y1
C
ZONE 2
T-STAT
C
W2
Y2
Y1
W1
R
. . . .
50
60
70
Room
Fan
i
Auto
W2 Y2 Y1 W1 R
RC O
G
B
OT OT
C
W2
Y2
Y1
W1
R
EWT-2SM
ZONE 1 THERMOSTAT
HEAT
o
68
Heat
W1 RC RH
ZONE 2
T-STAT
AM
10:30
Mon
Wake
System
Heat
{
EWC-STMS-2A
PANEL
Two stage heating and cooling
using T8624 programmable
digital thermostats
On STMS-3A Panel Wire
Zone 3 same as Zone 2
EWC-STMS-2A/3A
PANEL
. . . .
80
50
60
70
80
Model T8624
ZONE THERMOSTAT
COOL
10:30
AM
68
o
Room
Heat
Mon
Wake
System
Heat
FAN
ZONE 1
T-STAT
AUTO ON
HEAT OFF COOL
W1 Y1 Y2 W2 RC RH
O
EWTZONE 2 THERMOSTAT
2
G
WIRING DIAGRAM #3
W1 Y1 Y2 W2 R
RC O
G
B
OT OT
WIRING DIAGRAM #4
EWC-STMS-2A/3A
controlling a conventional
2 stage heat and 2 stage cool
system
70
80
80
50
60
70
EWC-STMS-2A
PANEL
60
50
Y
W
R
ZONE 2
T-STAT
SYSTEM
C
W2
Y2
Y1
W1
R
i
Auto
C
W1
Y1
HP
Y2
W2
R
O
E
G
B
C
W1
Y1
HP
Y2
W2
R
O
E
G
Two stage heating and cooling
using EWT-2SM T'stat on Zone 1
& single stage heating and cooling
using EWT T'stat on Zone 2
C
ZONE 1
T-STAT
Fan
{
. 60. 70
. 80
.
50
W2
EWT-2SM
ZONE 1 THERMOSTAT
HEAT
60
70
. . . .
80
24V
T'FORMER
HEAT 2 RELAY
. . . .
50
50
60
70
80
EWC-STMS-2A/3A
PANEL
W1
2
COOL
CB1
1
. 60. 70
. 80
.
50
HEAT 1 RELAY
Y2
FAN
AUTO ON
ZONE 1
T-STAT
HEAT OFF COOL
W1 Y1 Y2 W2 RC RH
C
W1
Y1
HP
Y2
W2
R
O
E
G
O
G
SYSTEM
COOL 2 RELAY
B
Y1
1
COOL 1 RELAY
G
FAN RELAY
R
1 Field installed jumper.
C
TRANSFORMER
2 Some Zones may not require 2 stage thermostats.
Small Zones should NOT be able to bring on
second stage heat (W2) or cooling (Y2).
4
B
O
HP
E
W2
W1
Y2
Y1
GC
R
GHC
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-635-8646
Connect this lead
to this terminal
to cycle fan in both heating and cooling
E-Mail- [email protected]
J1
WIRING DIAGRAM #6
WIRING DIAGRAM #5
EWC-STMS-2A/3A Heat Pump System
2 stage heat single stage cool
using EWT-HPH & EWT-2S thermostats
On STMS-3A Panel Wire
Zone 3 same as Zone 2
Heat Pump
Two stage heating and single stage cooling
using T8011 Digital Thermostats
On STMS-3A Panel Wire
Zone 3 Same as Zone 2
EWT-2S
ZONE THERMOSTAT
HEAT
. . . .
60
50
70
50
60
70
Model T8011
ZONE THERMOSTAT
Hold
Em. Ht.
Aux. Ht.
. . . .
80
80
Fr
72
FAN
SYSTEM
Auto On
Cool Off Heat Em. Ht.
C
EWC-STMS-2A
PANEL
Y
W1
E
ZONE 2
T-STAT
W2
Y2
Y1
W2
R
O
1
B
L
G
2
C
W2
Y2
Y1
W1
R
W1 RC RH
1
ZONE 2
T-STAT
C
W2
Y2
Y1
W1
R
Select
o
EWC-STMS-2A
PANEL
. . . .
Model T8011
ZONE THERMOSTAT
EWT-HPH
ZONE THERMOSTAT
. . . .
50
60
70
ZONE 1
T-STAT
EM. HEAT AUX. HEAT
C
W1
Y1
HP
Y2
W2
R
O
E
G
. . . .
HEAT PUMP THERMOSTAT
C
W1
Y1
HP
Y2
W2
R
O
E
G
FAN
AUTO ON
X
Y
E
Hold
Em. Ht.
Aux. Ht.
80
50 60 70 80
ZONE 1
T-STAT
EM. HEAT HEAT OFF COOL
W2
R
O
B
L
G
1
4:31pm
Fr
72
Select
o
FAN
SYSTEM
Auto On
Cool Off Heat Em. Ht.
C
W1 Y1
E
W2
R
O
L
G
B
1
Notes:
1. Field installed jumper.
2. When using T8011 T'STAT on Zones 2/3 switch
should be in same position as Zone 1 T'STAT.
If not panel will ignor its call.
1. Field installed jumper
WIRING DIAGRAM #7
WIRING DIAGRAM #8
Heat Pump
Two stage heating and single stage cooling
using T8011 & T8624 Digital Thermostats
On STMS-3A Panel Wire
Zone 3 same as Zone 2
EWC-STMS-2A/3A
controlling a heat pump
2 stage heat and single stage cool
with a single source of backup heat
3
Model T8624
ZONE THERMOSTAT
EWC-STMS-2A
PANEL
10:30
o
68
AM
Room
1. Connect reversing valve wire to terminal
"B" for heat pumps that energize the reversing
valve on heat cycle.
"O" for heat pumps that energize the reversing
valve in cool cycle.
Heat
Mon
Wake
System
Heat
C
ZONE 2
T-STAT
4:31pm
COOL
50 60 70 80
Y2 W2 Y1 W1
Fan
{
2
Heat Pump Thermostat and System Wiring
i
Auto
R RC
B
O
G
OT OT
2. Field installed jumper.
1
C
W2
Y2
Y1
W1
R
EWC-STMS-2A/3A
PANEL
24V
T'FORMER
SYSTEM
2
Model T8011
ZONE THERMOSTAT
2
CB1
RV
1
ZONE 1
T-STAT
Hold
Em. Ht.
Aux. Ht.
C
W1
Y1
HP
Y2
W2
R
O
E
G
4:31pm
Fr
72
Select
REVERSING
VALVE
o
Y
SYSTEM
1
FAN
SYSTEM
Auto On
Cool Off Heat Em. Ht.
{
COMPRESSOR
RELAY
W2
C
W1 Y1
E
W2
R
O
L
G
B
2
1
SECOND STAGE
HEAT RELAY
R
C
TRANSFORMER
G
Notes:
1. Field installed jumper.
2. DO NOT use auto change over mode on Zone 1.
3. Use Zone 2 Thermostat in autochange over mode.
B
O
HP
E
W2
W1
Y2
Y1
GC
R
GHC
J1
FAN RELAY
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-635-8646
E-Mail- [email protected]
5
2
Heat Pump System Wiring
WIRING DIAGRAM #10
WIRING DIAGRAM #9
EWC-STMS-2A/3A
controlling a heat pump
2 stage heat and single stage cool
with outdoor low temperature
compressor lockout.
EWC-STMS-2A/3A
controlling a heat pump
2 stage heat and single stage cool
with emergency heat.
1. Connect reversing valve wire to terminal
"B" for heat pumps that energize the reversing
valve on heat cycle.
"O" for heat pumps that energize the reversing
valve in cool cycle.
1. Connect reversing valve wire to terminal
"B" for heat pumps that energize the reversing
valve on heat cycle.
"O" for heat pumps that energize the reversing
valve in cool cycle.
2. Outdoor temperature control [ ODTC ] Field installed.
EWC-STMS-2A/3A
PANEL
SYSTEM
EWC-STMS-2A/3A
PANEL
SYSTEM
RV
RV
24V
T'FORMER
REVERSING
VALVE
2
CB1
Y
2
2
CB1
Y
1
1
COMPRESSOR
RELAY
COMPRESSOR
RELAY
E
E
SYSTEM
1
{
EMERGENCY
HEAT RELAY
W2
SECOND STAGE
HEAT RELAY
R
C
TRANSFORMER
G
SYSTEM
1
B
O
HP
E
W2
W1
Y2
Y1
GC
R
GHC
{
EMERGENCY
HEAT RELAY
J1
B
O
HP
E
W2
W1
Y2
Y1
GC
R
GHC
W2
SECOND STAGE
HEAT RELAY
R
C
TRANSFORMER
G
FAN RELAY
J1
FAN RELAY
WIRING DIAGRAM #12
WIRING DIAGRAM #11
T
T
B
R
O
B
O
Y
DUCT
SENSOR
HEAT PUMP
O.D. SECTION
Y
OUTDOOR
W
R
R
FURNACE
EWC-STMS-2A/3A
PANEL
B
FAN
RELAY
8
FAN
G
THERMOSTAT
R
Y
G W O
ODT 1
B
R
B
XFMR
BR
T
OR
O
BR/X2 or BW
LIMIT
CONTROL BOARD
FOSSIL FUEL KIT
24V
T'FORMER
2
NOTES:
4. THIS LEAD REQUIRED ONLY IF FURNACE NEEDS "Y" TO
DELIVER FULL COOLING AIRFLOW.
5. MAKE THIS JUMPER CONNECTION ONLY IF THE FURNACE
NEEDS FAN ENABLE SIGNAL FOR HEATING OPERATION.
6. THIS JUMPER REQUIRED ONLY FOR 2 STAGE FURNACES.
7. BONNET THERMOSTAT MODEL TAYPLUS101A REQUIRED
FOR OIL FURNACE APPLICATIONS.
8. TO LOCK OUT GAS FURNACE AT OUTDOOR TEMPERATURES
ABOVE ODT SET POINT DO NOT CONNECT WIRE TO
THERMOSTAT TERMINAL "W" AND TERMINAL "1" ON ODT.
OUTDOOR
SECTION
OUTDOOR
TEMPERATURE
SENSOR
EWC-STMS-2A/3A
PANEL
EWC-STMS-2A/3A controlling
2 stage heat/1 stage cool Heat Pump system
using a Trane add on Fossil Fuel kit
P/N TAYPLUS 103A
EWC-STMS-2A/3A controlling
Heat Pump system with a
Intercity Products Fossil Fuel kit
P/N AXA 001 RKAI
FURNACE
CONTROL
24V
T'FORMER
ODTC
REVERSING
VALVE
24V
T'FORMER
2
X2
YL
Y
RD
R
BL
B
3
CB1
1
SYSTEM
B
O
HP
E
W2
W1
Y2
Y1
GC
R
GHC
J1
2
CB1
1
3 PH ONLY
TRANSFORMER
24V
2
1
1. Field installed jumper.
2. No connection this terminal
6
}
W3
TO POWER
SUPPLY PER
LOCAL CODES
5
G3
SYSTEM
B
O
HP
E
W2
W1
Y2
Y1
GC
R
GHC
FURNACE
G
J1
W1
KI
G
B
KI-3
X2
KI-1
7
6
BT
W2
X3
R
W1
B
KI-2
Y3
Y
Y2
TDR-1
Y1
3 PH ONLY
}
TO POWER
SUPPLY PER
LOCAL CODES
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-635-8646
4
TAYPLUS 103A
E-Mail- [email protected]
TDR
Expansion Panel Wiring
EWC-STEX- 4B-Expansion Panel
Z4
ZONE D
MOTOR
M6
M4
M2
M1
K4
OPEN
2
CLOSED
D22
D19
D21
R4
C8
D2
D3
D27
D25
D28
D26
TO MAIN
CONTROL PANEL
+
-
CONTROL SYSTEM
C R OW Y
2 2
EWC-STEX- 4B-Expansion Panel
ZONE D
MOTOR
M6
M4
M2
M1
K4
OPEN
CLOSED
2AG 3AMP
SLO-BLO
1
SPARE
C4
D24
D20
D22
D19
D21
ZONE D
T'STAT
C
W2
W1
Y1
Y2
R
R4
C8
D2
D3
D27
D25
D28
D26
TO MAIN
CONTROL PANEL
-
CONTROL SYSTEM
C R OW Y
2 2
EWC-STMS-3A Control Panel
ZONE 3
MOTOR SW3 OPEN
M6
M4
M2
M1
K3
D15
D16
D14
D13
K5
K1
Z5
Z1
C1
C
W2
Y2
Y1
W1
R
D17
K6
Z6
C6
D4
R1
D6
D5
CLOSED
D2
Z7
D1
C7
K7
ZONE 1 T-STAT
C
W1
Y1
HP
Y2
W2
R
O
E
G
K4
Z4
D22
C4
D21
CB1
2
ZONE 3
T'STAT
R3
D18
24V
T'FORMER
K8
24V
1
TRANSFORMER
24V, 40VA
Z3
C3
CLOSED
ZONE 1 SW1
MOTOR
OPEN
M6
M4
M2
M1
Z8
C8
D19
D20
D32
SYSTEM
B
O
HP
E
W2
W1
Y2
Y1
GC
R
GHC
Y2
R
.
DO NOT connect to
voltages above 30 VAC.
R
CONTROLS INC.
Englishtown, NJ
FUSE
R8
K8
C6
+
TRANSFORMER
24V, 40VA
D23
Z6
FUSE
2
24V
Z4
SW4
K6
24V
T'FORMER
Y2
R
.
DO NOT connect to
voltages above 30 VAC.
R
CONTROLS INC.
Englishtown, NJ
FUSE
R8
K8
C6
FUSE
SPARE
1
TRANSFORMER
24V, 40VA
D24
Z6
2AG 3AMP
SLO-BLO
24V
C4
D20
WIRING DIAGRAM #13
C
W2
W1
Y1
Y2
R
SW4
K6
24V
T'FORMER
ZONE D
T'STAT
D23
D31
K11
Z11
D33
C11
D34
D30
J1
K10
Z10
C10
D29
D27
D28
K9
Z9
D26
D25
C9
D23
D24
CAUTION
PLEASE read all
instructions carefully
before starting the
installation procedures.
DO NOT connect to
voltages above 30 VAC.
ADDITIONAL {
ZONE PANEL
W2
Y2
O
R
C
+
-
R
CONTROLS INC.
Englishtown, NJ
CONTROL SYSTEM
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-635-8646
E-Mail- [email protected]
7
DAMPER WIRING
TRANSFORMER
WIRING DIAGRAM #14
Rectangular Damper wiring
A separate 24 volt 40 VA transformer is required and must
be connected to terminals 1and 2 of the terminal block
labeled "T-Former". This transformer powers the control
panel, thermostats, and damper motors. It does not power
the system control circuit. The board is protected by
a polyfuse circuit breaker at the transformer input. The
polyfuse overheats and opens the circuit to protect the
panel. Removing power from the board allows the polyfuse
to cool and automatically reset. If polyfuse overheats, check
field wiring for shorts or miswires, especially damper motor
wiring.
Jumper
Wire
4
5
6
Z
1
2
3
X
D
M
P
R
1
A single rectangular damper motor is
wired to the M1, M4 and M6 terminals
as shown.
DAMPER WIRING
M6
M4
M2
M1
Control Panel
Description of damper motor
terminals on control panel
Terminal M1 Common.
4
Jumper
Wire
Terminal M2 Constant 24VAC.
1
Terminal M4 24VAC to
5
2
6
Z
3
Jumper
Wire
X
4
5
6
Z
1
2
3
X
D
M
P
R
1
M6
M4
M2
M1
open damper.
Terminal M6 24VAC to
Wiring two rectangular damper
motors controlled by one zone as
close damper.
Control Panel
WIRING DIAGRAM #15
Controlling 3 or more rectangular
dampers from One Zone
Numbers in circles below refer to the terminal numbes on the socket for the R4 relay.
TRANSFORMER
24V, 40VA
R4
Relay
Coil
R4 Type Relay
5
Jumper
Wire
9
1
6
10
2
7
13
14
11
3
8
12
D
M
P
R
1
M6
M4
M2
M1
4
4
5
6
Z
4
5
6
Z
4
5
6
Z
4
5
6
Z
1
2
3
X
1
2
3
X
1
2
3
X
1
2
3
X
Control Panel
A relay can be added to the system to control more than two dampers per zone. The diagram shows a
relay used to control four dampers using the "R4" relay which has four sets of contacts (4-pole) with both
normally open and normally closed contacts. If more than four dampers are required on a single zone, a
second R4 relay can be added and the coils wired in parallel.
8
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-635-8646
E-Mail- [email protected]
CLOSED OPEN
WIRING DIAGRAM #17
Wiring MA-SMDL Motor
Actuators to ULTRA-ZONE
Control Panels
ZONE 1
MOTOR
MA-SMDL
CLOSED OPEN
MA-SMDL
CLOSED OPEN
1 2 4
1 46
MA-URD
CLOSED OPEN
1 2 4
1 46
MA-ND2
CLOSED OPEN
1 2 4
1 46
Wiring MA-ND and MA-URD Motor
Actuators to ULTRA-ZONE
Control Panels
MA-URD
WIRING DIAGRAM #16
MA-SMDL
CLOSED OPEN
Damper Wiring
SW1
OPEN
M6
M4
M2
M1
ZONE 1
MOTOR
24V
T'FORMER
CLOSED
24V
T'FORMER
CB1
2
SW1
OPEN
M6
M4
M2
M1
CLOSED
CB1
2
1
1
WIRING DIAGRAM #18
WIRING DIAGRAM #20
Wiring Model MA-L Motor Actuators [ Belimo KM 24 ]
to a ULTRA-ZONE Control Panel
Spring Return Motor wiring
ULTRA-ZONE
CONTROL PANEL
CONTROLS INC.
Englishtown, NJ
24V
3
2
1
M6
M4
M2
M1
24V
T'FORMER
D
M
P
R
1
{
MA-ESR
R
MA-L
M6
M4
M2
M1
NC NO C M M
2
R
CONTROLS INC.
Englishtown, NJ
MA-L
1
3
2
1
{
24V
2
Note:
1. When using more than one damper per
Zone, wire motors in parallel as shown.
Maximum of 12 MA-L motors may be
wired to a control panel.
2. To additional dampers as required.
This diagram shows how to wire a spring return
damper. A power close style damper is wired M1 & M6.
Power open style damper is wired to M1 & M4.
WIRING DIAGRAM #19
WIRING DIAGRAM #21
Wiring Model PAOB-F [ Belimo NM-24 ]
to a ULTRA-ZONE Control Panel
Round Damper wiring
ULTRA-ZONE
CONTROL PANEL
0
1
0
NM-24
MA-RDN
1
NM-24
L [Y=0
R [Y=0
]
]
L [Y=0
R [Y=0
]
]
2
{
White
Red
Black
Control Panel
M6
M4
M2
M1
24V
T'FORMER
1
MA-RDN
White
Red
Black
1
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-635-8646
D
M
P
R
1
M6
M4
M2
M1
E-Mail- [email protected]
9
Service Notes
The EWC-STMS-2A/3A is a multiuse control
panel. The panel can be wired to a conventional
single stage or 2 stage heating/cooling system
or to a heat pump system. Therefore verify that
the installation is wired for the intended
application.
Assuming the heating/cooling equipment
checks out fine, shut off the power at the
furnace or heat pump. If it does not check out correct the problems before proceeding with
testing of the zoning system.
To check out the installation, first check that the
Heating/Cooling system is operational. Do this
by using a jumper wire on the control panel
"system" terminal block.
When testing the zone control system, the
power at the furnace should be off, to prevent
compressor short cycling and other controls
being cycled needlessly.
Conventional
Heat/Cool
System
Jump from "R" to "Y1" Compressor and fan
should turn on.
.
"R" to "G" - Compressor
and fan should turn on.
(due to STMS internal
circuitry)
"R" to "W1" - Heat should
turn on.
With 1st stage running,
see that the 2nd stage is
working by shorting "Y1" to
"Y2" on cooling cycle and
by shorting "W1" to "W2"
on heating cycle.
Heat Pump
System
Determine if reversing
valve is to be energized in
the cooling or heating
mode.
Jump from "R" to "Y1" Compressor and fan
should turn on in heating
or cooling mode depening
on system.
"R" to "G" - same as above.
Zone Control System Power
1. Check that there is 24VAC on terminals
1 and 2 from the transformer.
2. Check that there is 24VAC on terminals
M1 and M2 for each zone damper. If
voltage measured is less than 5 volt,
check "Polyfuse" for overheating. If
Polyfuse is hot, it is usually caused by a
shorted cable, a miswired damper
motor or thermostat.
To find the problem, start with damper
wiring. Disconnect one cable at a time,
remove power from panel and wait 30
seconds. Restore power and recheck
voltage at terminals M1 and M2. If
voltage is restored, that is the cable
with the short or miswire. To be sure
that there is not more than one shorted
cable, reconnect removed cables one
at a time, monitoring the 24V power to
make sure there are no more shorts.
3. Check each zone thermostat terminal
block "C" to "R" to make sure that there
is power to each thermostat.
4. Make sure that the proper thermostat is
wired to each zone. "On Heat Pump
Systems" the Zone 1 thermostat MUST
be a "Heat Pump Thermostat", Zones 2
and 3 and all expansion zones require
conventional thermostats
[ see diagrams #5 to #8 ].
"R" to "Y1" + [O or B] Compressor and fan should
turn on in the opposite
mode to step 1.
10
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-635-8646
E-Mail- [email protected]
Service Notes
Damper Operation
5. If panel will not go into "Cool" mode,
make sure Zone 1 thermostat is in
"Cool" mode and that there is 24VAC
present between "C" and "O" terminals
on Zone 1 thermostat terminal block. If
the thermostat is in the "Cool" mode
and there is no 24VAC between
terminals "C" and "O" on the panel,
check out the wiring, subbase and
thermostat to determine where the
problem is.
If panel will not work in "Heat" mode,
make sure Zone 1 thermostat is in
"Heat" mode, and that there is NO
voltage between terminals "C" and "O"
and "C" and "E". If voltage [24VAC] is
present, check wiring, subbase and
thermostat. If voltage is present on
terminal "O" the panel is in the "cooling
mode". Voltage on terminal "E" puts the
panel into "Emergency Heat" mode and
will not permit the compressor to run in
the Heating or Cooling mode.
Before starting to check dampers for proper
operating sequence, put all "Open-Closed"
switches on panel in "Open" position.
Determine how many and what model of
damper is connected to each zone. Verify that
they are wired per the correct schematic for
the number and model of damper used.
[ see schematics #14 to #21 ]
Start test with all zone thermostats satisfied all dampers should be open. Make Zone 1
thermostat call - Zone 1 damper should stay
open, all others should close.
Repeat this test with all other zones - have that
zone thermostat call with all others satisfied that damper remains open, all others should
close. The control panel damper terminal
block outputs are as follows
M1 = 24V common
M2 = 24V constant
M4 = 24V signal to open
M6 = 24V signal to close
Damper Models
After review of service notes, the
problem cannot be resolved, then
call the Technical Support hot-line
(1-800-526-4048).
On Models SMD, BMD and IMD dampers, also
wall registers, ceiling diffusers and floor
registers using Model MAN motor actuators make sure that there is a "Jumper" from
terminal "2" to "5". Power on terminal 1 and 4
drives the damper open and power on
terminals 1 and 6 drives it closed.
Model ND same as above but no "Jumper" is
needed.
Model RDN and SMDLED - apply power [24V]
between terminals 1 and 2 damper should
drive closed and stop. With power (24V)
applied to terminals 1 and 2 plus 4, damper
should drive open and stop.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-635-8646
E-Mail- [email protected]
11
WIRING DIAGRAM
Model STMS
Control Panel
HEAT PUMP AND 2 STAGE WIRING
Rectangular Damper
Motor Wiring
HEAT
4
. . . .
50
60
70
. . . .
80
50
60
70
COOL
80
50 60 70 80
. . . .
4
1
EWT-2S
ZONE 3 THERMOSTAT
5
6
HEAT PUMP WIRING
Z
EWC-STMS-3A Control Panel
Jumper
Wire
1
2
3
ZONE 3
MOTOR SW3 OPEN
X
M6
M4
M2
M1
K3
Z3
D15
C3
D16
D14
D13
Z5
K5
D17
W2
Y2
Y1
W1 RC RH
C
W2
Y2
Y1
W1
R
D18
CLOSED
Round Damper
Motor Wiring
EWC-STMS-2A/3A
controlling a heat pump
2 stage heat & single stage cool
with emergency heat
ZONE 3
T'STAT
R3
K6
Z6
C6
1
EWT-HPH
ZONE 1 THERMOSTAT
. . . .
50
RV
M6
M4
M2
M1
REVERSING
VALVE
TRANSFORMER
24V, 40VA
Y
C1
CLOSED
50 60 70 80
. . . .
D2
Z7
D1
C7
K7
ZONE 1 T-STAT
D22
C4
D21
CB1
K8
Z8
C8
SYSTEM
D19
D20
D31
B
O
HP
E
W2
W1
Y2
Y1
GC
R
GHC
{
W2
SECOND STAGE
HEAT RELAY
R
C
TRANSFORMER
G
K11
Z11
D33
C11
D34
D30
J1
K10
Z10
C10
D29
D27
D28
K9
Z9
D26
D25
C9
D23
D24
CAUTION
W2
Y2
O
R
C
+
-
PLEASE read all
instructions carefully
before starting the
installation procedures.
DO NOT connect to
voltages above 30 VAC.
ADDITIONAL {
ZONE PANEL
AUTO ON
X
Y
EM. HEAT HEAT OFF COOL
E
W2
R
CONTROLS INC.
Englishtown, NJ
CONTROL SYSTEM
O
B
L
G
1
}
2
EWT-2S
ZONE 3 THERMOSTAT
R
FAN RELAY
FAN
C
W1
Y1
HP
Y2
W2
R
O
E
G
Z4
D32
EMERGENCY
HEAT RELAY
EM. HEAT AUX. HEAT
80
R1
D6
K4
1
3
70
HEAT PUMP THERMOSTAT
24V
E
60
D5
24V
T'FORMER
2
COMPRESSOR
RELAY
Z1
K1
ZONE 1 SW1
MOTOR
OPEN
D4
HEAT
4
. . . .
50
60
70
. . . .
80
50
60
70
80
COOL
50 60 70 80
Rectangular Damper
Motor Wiring
1
. . . .
4
5
6
2 STAGE WIRING
Z
EWC-STMS-3A Control Panel
Jumper
Wire
1
EWC-STMS-2A/3A
controlling a conventional
2 stage heat and 2 stage cool
system
2
3
ZONE 3
MOTOR SW3 OPEN
X
M6
M4
M2
M1
K3
Z3
D15
C3
D16
ZONE 3
T'STAT
R3
D18
CLOSED
D14
D13
Z5
Round Damper
Motor Wiring
K5
D17
Y2
K6
K1
ZONE 1 SW1
MOTOR
OPEN
M6
M4
M2
M1
HEAT 2 RELAY
W1
TRANSFORMER
24V, 40VA
C1
Z6
C6
CLOSED
EWT-2SM
ZONE 1 THERMOSTAT
D2
Z7
D1
C7
R1
G
FAN RELAY
R
Z8
C8
D19
D20
D31
K11
Z11
D33
C11
D34
K10
Z10
C10
D29
CAUTION
D27
PLEASE read all
instructions carefully
before starting the
installation procedures.
DO NOT connect to
voltages above 30 VAC.
D28
K9
Z9
D26
D25
C9
D23
D24
Connect this lead
to this terminal
to cycle fan in both heating and cooling
EWC
R
70
80
COOL
Technical. . . . . . . . . . 1-800-526-4048
Sales. . . . . . . . . . . . . .1-800-446-3110
Fax. . . . . . . . . . . . . . . 1-732-635-8646
e-mail. [email protected]
385 Highway 33, Englishtown, NJ 07726
O
G
B
1
D30
J1
ADDITIONAL {
ZONE PANEL
R
Excellence Without Compromise
60
HEAT OFF COOL
W1 Y1 Y2 W2 RC RH
C
W1
Y1
HP
Y2
W2
R
O
E
G
D21
K8
C
TRANSFORMER
. . . .
50
AUTO ON
ZONE 1 T-STAT
D32
COOL 1 RELAY
80
FAN
K7
C4
CB1
B
O
HP
E
W2
W1
Y2
Y1
GC
R
GHC
70
. . . .
D22
SYSTEM
Y1
50 60
50 60 70 80
Z4
1
COOL 2 RELAY
. . . .
D6
K4
24V
Y2
D4
W1 RC RH
D5
24V
T'FORMER
2
HEAT 1 RELAY
Z1
Y1
1
HEAT
W2
12 CONTROLS INC.
W2
C
W2
Y2
Y1
W1
R
CONTROLS INC.
Englishtown, NJ
CONTROL SYSTEM
All wiring should be done to local
and national codes and ordinances.
Use color-coded multi-conductor
wire. Wire number to number or
W2
Y2
O
R
C
+
-
}
NOTES:
2
1. Field installed jumper.
2. To add expansion
panels see TB-117.
3. Wire to Terminal "O"
or "B" depending on
system Reversing Valve.
See TB-117.
4. Zone 2 & 3 must be
conventional thermostatsnot Heat Pump.
WARNING: THIS PANEL IS
DESIGNED FOR USE WITH
24 VOLTS. DO NOT USE
ANY OTHER VOLTAGE!