Small Packaged Products
1-1/2 to 5 Tons (50/60 Hz) Accessory
Motormaster II Head Pressure Controller
Cancels: IIK 555A-18-36
IIK 555A-18-37
6–02
Installation Instructions
Part Numbers
CPLOWAMB001A00,
CPLOWAMB002A00
NOTE: Read the entire instruction manual before starting the
installation.
SAFETY CONSIDERATIONS
Installation, start-up and servicing of this equipment can be
hazardous due to system pressures, electrical components, and
equipment location (roofs, elevated structures, etc.)
Only trained, qualified installers and service technicians should
install, start up, and service this equipment.
When working on this equipment, observe precautions in the
literature, tags, stickers, and labels attached to the equipment, and
any other safety precautions that may apply.
DESCRIPTION AND USAGE
The Motormaster II head pressure controller is a cycle control
device activated by a temperature sensor mounted on a header tube
of the outdoor coil (see Fig. 1). It is designed to cycle the
outdoor-fan motors to maintain the saturated condensing temperature within normal operating limits of approximately 130 to 110°F
high, 70 to 50°F low (55–43°C high, 21 to 10°C low). The
controller maintains working head pressure at low ambient temperatures down to –20°F when properly installed.
INSTALLATION
1. Disconnect power to unit. Install lockout tag.
2. Remove unit access panel.
3. Disconnect outdoor-fan motor (OFM). (See Wiring Schematic, Fig. 8 or 9)
Open all remote disconnects before servicing this equipment.
Electrical shock could result in serious injury or death.
INTRODUCTION
These instructions cover the installation of the Motormaster II
Controller head pressure control device. Refer to the Installation
section for directions. Louvered panels are required for this
installation; see Note 9 in the Installation section of this document
and Tables 1 and 2 for more information.
Table 1—Add Louvered Panels to These Units
48GS
48GX
50GS
50GX
50JS
50JX
582A
583A
701A
702A
601A
602A
PY1P-B
PY2P-B
PA1P-B
PA2P-B
PH1P-B
PH2P-B
Table 2—Do NOT Add Louvered Panels to These
Units
50SX
50HX
50ZP
50ZH
48GP*
50GL*
50JZ*
48JZ*
557A
657A
564A
664A
583B*
702B*
602B*
683B*
PA1Z
PH1Z
4. Remove OFM wires from unit control box.
5. Mount Motormaster II Controller on unit. Refer to Fig. 3–6.
The controller must be mounted vertically with the leads at the
bottom. Using the Mounting Template (Fig. 10) as a guide,
drill mounting holes. To ensure electrical ground, insert star
washers (supplied with the controller) under the heads of
mounting screws.
NOTE: Field-supplied conduit must be used between controller
and access panel (or wire into unit entrance).
6. Determine sensor location by referring to Fig. 11–25. Route
sensor wire through bottom of Motormaster II Controller (Fig.
1.) to sensor location specified. Prior to installation, apply
conductive grease supplied with accessory to contact surface
of sensor.
Sensor assembly is delicate. Handle with care.
7. Attach sensor to top half of header tube as shown in Fig. 2.
Installed sensor must be left uninsulated.
8. Power wiring must comply with all local and National
Electrical Code (NEC) and International Electric Code (IEC)
requirements. Refer to Fig. 8 and 9 for power wiring connections. Coil up all excess wire and secure. (Yellow and blue
wires, from controller, must run to unit contactor and connect
on the load side.)
* Louvered panels are standard on these units.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4 1 4 1 4
PC 101
Catalog No. 534–80118
Printed in U.S.A.
Form 48/50–105SI
Pg 1
6–02
Replaces: 48/50–101SI
Tab 1a 6a 1b 6b 5a 5a
Motormaster® II Controller Interior
C00102
Fig. 1—Controller Interior
SENSOR
INTEGRAL
WIRE TIE
3/8"
HEADER TUBE
CONDUCTIVE GREASE
NOTE: INSTALLED SENSOR MUST BE LEFT UNINSULATED.
Sensor Connection Details
C00103
Fig. 2—Sensor Connection Details
condensing temperature approximately 20°F higher than the standard operating mode. In this alternate mode, the outdoor fan begins
cycling at higher outdoor ambient temperatures. This mode should
only be used if the evaporator coil shows signs of frosting at low
outdoor ambient temperatures.
All wires must be secured so that they are not in contact with
unit tubing.
9. To prevent wind cross-currents from causing abnormally low
condensing temperatures, louvered panels are required on
some models. See Table 1 and 2 for models requiring/not
requiring louvered panels.
To select the alternate operating mode, move the jumper wire on
the Motormaster II control board from reset T1 to reset T2.
Refer to Fig. 7 for thermistor resistance vs. temperature.
10. Reconnect power to the unit.
The Motormaster II head pressure controller is equipped with an
alternate operating mode. When this mode is selected, the controller shifts the fan cycle sequence to effectively raise the average
2
MOTORMASTER II
WIRE LEADS
BULKHEAD
COMPRESSOR
CONDENSER COIL
MOTORMASTER II
SLICE PLASTIC
SERVICE CAP DN
UNIT AND FEED
LEADS
50ZP, ZH, 564A/664A, PA1Z/PH1Z UNITS
C00108
Fig. 3—Mounting Locations
1 3/8”
EVAP COIL
ACCESS PANEL
MOTORMASTER II
CONTROLLER
MOTORMASTER II
CONTROLLER
CONDUIT
6”
FROM BOTTOM
OF UNIT
CONDUIT
HOLE LOCATION
FOR CONDUIT
CONNECTION
50SX/ 557A
50HX/ 657A
C00141
Fig. 4—Mounting Locations
3
BULKHEAD
MOTORMASTER II
MOTORMASTER II
WIRE LEADS
SLICE PLASTIC
SERVICE CAP ON
UNIT AND FEED LEADS
COMPRESSOR
48/50GS, GX, JS, JX, GP, GL, JZ UNITS
582A/701A, 583A/702A, 601A, 602A, 583B, 702B, 602B,683B
PY1P-B/PA1P-B, PY2P-B/PA2P-B, PH1P-B, PH2P-B
SMALL CABINET
C00109
Fig. 5—Mounting Locations-Small Cabinet
BULKHEAD
MOTORMASTER II
MOTORMASTER II
WIRE LEADS
SLICE PLASTIC
SERVICE CAP ON
UNIT AND FEED LEADS
COMPRESSOR
48/50GS, GX, JS, JX, GP, GL, JZ UNITS
582A/701A, 583A/702A, 601A, 602A, 583B, 702B, 602B, 683B
PY1P-B/PA1P-B, PY2P-B/PA2P-B, PH1P-B, PH2P-B
LARGE CABINET
C00110
Fig. 6—Mounting Locations-Large Cabinet
4
Table 3—Sensor Mounting Locations
MODEL NUMBER
50JX/602A/PH2P-B 024-048
50JX/602A/PH2P-B 060 and 50JS/601A/PH1P-B 018-030
50JS/601A/PH1P-B 036-060
48GS/582A/PY1P-B/50GS/701A/PA1P-B 018-036 and
48GX/583A/PY2P-B/50GX/702A/PA2P-B 024-030
48GS/582A/PY1P-B/50GS/701A/PA1P-B 042-060 and
48GX/583A/PY2P-B/50GX/702A/PA2P-B 036-060
48GP/50GL/583B/702B 024-048 and 50GL 024-048
48GP/50GL/583B/702B 060
48/50JZ/683B/602B 024–060
50ZP/564A/PA1Z 024–042
50ZP/564A/PA1Z 048–060
50ZH/664A/PH1Z 024–042
50ZH/664A/PH1Z 048–060
50SX/557A 024–060
50HX/657A 048–060
50HX/657A 024–042
FIGURE NUMBER
Fig. 11
Fig. 12
Fig. 13
Fig. 14
Fig. 15
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
16
17
18
19
20
21
22
23
24
25
50,000
RESISTANCE (OHMS)
40,000
30,000
20,000
10,000
0
20
40
60
80
100
120
140
TEMPERATURE (F)
Thermistor Rsistance vs Temperature
C00104
Fig. 7—Thermistor Resistance vs. Temperature Chart
5
OUTDOOR-FAN MOTOR
SINGLE-PHASE UNITS
3-PHASE UNITS
UNIT CONTROL BOX
UNIT CONTROL BOX
C
BLK
YEL
C
L1
T1
21
L2
21
BRN
C
BLK
T2
23
BLK
23
THIS WIRE
RELOCATED
FROM BASE
UNIT CONTACTOR
YEL
YEL
048.060
UNITS
YEL
YEL
YEL
VIEW A
YEL
BLU
VIEW A
208/230-V
UNITS ONLY
MOTORMASTER II CONTROL BOX
OFC
BLK
OF1
OF2
DR
BLU
ORANGE
RED
YEL
BLK
460
L2
208
230
T2
LOW VOLTAGE
CONTROL BOX*
BLK
OFC
T1
L1
O
C
C
TRAN
(SEE
NOTE #1)
460-V
UNITS ONLY
BLK
A
24
RED BRN
OFR
1
3
C
GRN-YEL
3
R
C
C1
OFC C2
ORG
COIL
4
1
(SEE
NOTE #2)
5
BRN
LOGIC BOARD
BLU
W1
LEGEND
C
DR
OFC
OFR
TRAN
T2
S2
YEL
T1
S1
YEL
RELOCATE JUMPER TO
TERMINAL T2 FOR
ALTERNATE OPERATION.
Field supplied relay for all
Heat pumps should be
located in the control box of
the unit.
CONTROL THERMISTOR
Contactor
Defrost Relay
Outdoor-Fan Contactor
Outdoor-Fan Relay
Transformer
Field Wiring
*In low voltage control box, “O” is orange and “C” is Brown (common).
NOTES:
1. Motomaster® II transformer is wired for 460-v supply; it must be rewired for 208/230-v application.
Be sure to insulate unused tap.
2. Relay, part no. HN61KB324, is field supplied and normally closed.
3. CPLOWAMB002A00 transformer only contains a 400-v. supply.
C00106
Fig. 8—Wiring Schematic, Heat Pumps
6
OUTDOOR-FAN MOTOR
SINGLE-PHASE UNITS
3-PHASE UNITS
UNIT CONTROL BOX
UNIT CONTROL BOX
C
L1
BLK
C
T1
21
C
L2
BLU
T2
23
BLU
YEL
THIS WIRE RELOCATED
FROM BASE UNIT
CONTACTOR
YEL
MOTOMASTER CONTROL BOX
BLK
SEE
NOTE
460
230
OFC
L2
ORANGE
RED
YEL
208
A
BLK
L1
T1
C
C
24
RED BRN
GRN-YEL
C1
R
T2
OFC
OFC
C2
C
ORG
BRN
LOGIC BOARD
W1
T2
S2
YEL
T1
S1
YEL
RELOCATE JUMPER TO
TERMINAL T2 FOR
ALTERNATE OPERATION
CONTROL THERMISTOR
LEGEND
C
- Contractor
OFC - Outdoor- Fan Contactor
TRAN - Transformer
NOTE:
1. Motormaster® II is wired for 460-v supply; it must be rewired for 208/230-v
application. Be sure to insulate unused tap.
2. CPLOWAMB002A00 Transformer only contains a 400V supply.
C00140
Fig. 9—Wiring Schematic, AC and Gas PACs
7
MOUNTING TEMPLATE
5-3/8" REF [136.5]
TOP
CUT ALONG
SOLID BORDER
LINES TO
REMOVE
TEMPLATE
DRILL 9/64" [3.6]
DIAMETER HOLE
9" REF
[228.6]
TEMPLATE FOR
MOTORMASTER® II
CPLOWAMB001A00
NOTE: Dimensions in [ ] are in millimeters
5"
[127]
DRILL 9/64" [3.6]
DIAMETER HOLE
2-3/8" REF
[60.3]
1-1/8" REF
[28.6]
C00105
Fig. 10—Controller Mounting Template
8
SENSOR
LOCATION
SENSOR
LOCATION
50 JX, 602A, PH2P-B 024
Left Back
50 JX, 602A, PH2P-B 042
Left Back
SENSOR
LOCATION
SENSOR
LOCATION
50 JX, 602A, PH2P-B 030/036
Left Back
50 JX, 602A, PH2P-B 048
Left Back
C00111
Fig. 11—Sensor Mounting Location
SENSOR
LOCATION
SENSOR
LOCATION
50JX, 602A,PH2P-B 060
LEFT BACK
50JS, 601A,PH1P-B 024
LEFT BACK
SENSOR
LOCATION
SENSOR
LOCATION
50JS, 601A,PH1P-B 018
LEFT BACK
50JS, 601A,PH1P-B 030
LEFT BACK
Fig. 12—Sensor Mounting Location
9
C00112
SENSOR
LOCATION
SENSOR
LOCATION
50JS.601A.PHIP-B 036
50JS.601A.PHIP-B 048
LEFT BACK
LEFT BACK
SENSOR
LOCATION
SENSOR
LOCATION
50JS.601A.PHIP-B 042
50JS.601A.PHIP-B 060
LEFT BACK
LEFT BACK
Fig. 13—Sensor Mounting Location
10
C00113
SENSOR
LOCATION
RETURN BEND END
48GS, 582A, PY1P-B, 50GS, 701A, PA1P-B, 018, 024, 030 & 036
48GX, 583A, PY2P-B, 024, 50GX, 702A, PA2P-B, 024
LEFT BACK
SENSOR
LOCATION
RETURN BEND END
50/48GX030, 702A/583A030, PA2P/PY2P 030 (B SERIES)
LEFT BACK
C00114
Fig. 14—Sensor Mounting Location
11
SENSOR
LOCATION
SENSOR
LOCATION
48GS.582A,PY1PB042
50GS,701A,PY2PB042
48GX,583A,PY2P-B 036
50GX,702A,PA2P-B 036
LEFT BACK
50/48GS048
701A/582A048
PA1P/PY1P048 (B SERIES)
LEFT BACK
RETURN BEND END
RETURN BEND END
SENSOR
LOCATION
SENSOR
LOCATION
50/48GS/060
RETURN BEND END
701A/582A060
PA1P/PY1P060
48/50GX042&048
583A/702A042&048
PY2P/PA2P042&048 (B SERIES)
LEFT BACK
Fig. 15—Sensor Mounting Location
12
48/50GX060
RETURN BEND END
702A/582A/583A060
PA2P/PY1P/PY2P060 (B SERIES)
LEFT BACK
C00115
SENSOR
LOCATION
SENSOR
LOCATION
48GP024/50GL024
583B024/702B024
LEFT BACK
48GP030/50GL030
583B030/702B030
LEFT BACK
SENSOR
LOCATION
SENSOR
LOCATION
48GP036/50GL036
583B036/702B036
LEFT BACK
48GP042, 048/50GL042, 048
583B042, 048/702B042, 048
LEFT BACK
C00116
Fig. 16—Sensor Mounting Location
13
SENSOR LOCATION
48GP060/50GL060
583B060/702B060
LEFT BACK
C00117
Fig. 17—Sensor Mounting Location
SENSOR
LOCATION
SENSOR
LOCATION
48/50JZ024
683B/602B024
LEFT BACK
48/50JZ030, 036
683B/602B030, 036
LEFT BACK
SENSOR
LOCATION
SENSOR
LOCATION
48/50JZ042, 048
683B/602B042, 048
LEFT BACK
48/50JZ060
683B/602B060
LEFT BACK
C00118
Fig. 18—Sensor Mounting Location
14
SENSOR
LOCATION
SENSOR
LOCATION
50ZP, 564A, PA1Z030
50ZP, 564A, PA1Z024
SENSOR
LOCATION
SENSOR
LOCATION
50ZP, 564A, PA1Z036
50ZP, 564A, PA1Z042
C00119
Fig. 19—Sensor Mounting Location
15
SENSOR
LOCATION
SENSOR
LOCATION
50ZP/564A/PA1Z048
50ZP/564A/PA1Z060
Fig. 20—Sensor Mounting Location
C00120
SENSOR
LOCATION
SENSOR
LOCATION
50ZH/664A/PH1Z030
50ZH/664A/PH1Z024
SENSOR
LOCATION
SENSOR
LOCATION
50ZH/664A/PH1Z036
50ZH/664A/PH1Z042
C00121
Fig. 21—Sensor Mounting Location
16
SENSOR
LOCATION
50ZH/664A/PH1Z060
SENSOR
LOCATION
50ZH/664A/PH1Z048
C00122
Fig. 22—Sensor Mounting Location
17
SENSOR
LOCATION
SENSOR
LOCATION
50SX/557A 024
50SX/557A 030/036
SENSOR
LOCATION
SENSOR
LOCATION
50SX/557A 042/048
50SX/557A 060
C00123
Fig. 23—Sensor Mounting Location
18
Sensor
Location
Sensor
Location
50HX/657A/060
50HX/657A/048
C00127
Fig. 24—Sensor Mounting Location
Sensor
Location
Sensor
Location
50HX/657A024
50HX/657A030
Sensor
Location
Sensor
Location
50HX/657A042
50HX/657A036
C00128
Fig. 25—Sensor Mounting Location
19
Copyright 2002 Carrier Corporation
555a1837
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4 1 4 1 4
PC 101
Catalog No. 534–80118
Printed in U.S.A.
Form 48/50–105SI
Pg 20
6–02
Replaces: 48/50–101SI
Tab 1a 6a 1b 6b 5a 5a