Heating Line Product Guide 435.0
Ignition Controls Section
Product Bulletin G67
Issue Date 1098
G67 Intermittent Pilot Ignition Controls
The G67 Intermittent Pilot Ignition
(IPI) Control is used to
automatically light a pilot burner
and energize the main burner
gas valve of a heating system in
response to the thermostat’s call
for heat. When the heating load is
satisfied, the thermostat opens
and the G67 de-energizes the
pilot and main burner gas valves.
The G67 can be used with
equipment with a maximum firing
rate of 117 kW (400,000 Btu/hr)
Any application over 117 kW
(400,000 Btu/hr) must be
approved in advance by the
Johnson Controls Application
Engineering Department.
Figure 1: G67 Intermittent Pilot
Ignition Control
Figure 2: EC Approved G67EG
Intermittent Pilot Ignition Control
Features and Benefits
❑ Energy Efficient
Allows pilot gas to be on only during the run
cycle
❑ High Energy Spark
Promotes consistent dependable pilot lighting
❑ Compact Size
Provides limited space applications
❑ Solid State Components
Provides long life
❑ Quick Response to Loss of
Provides rapid closure of main valve
(0.8 second maximum)
Pilot Flame
❑ G67EG Approved Worldwide
© 1998 Johnson Controls, Inc.
Code No. LIT-4350400
Broadens applications to include global markets
1
www.johnsoncontrols.com
A pplication
S equence of Operation
The G67 ignition control may only be used for
two types of applications:
Figure 3 illustrates the sequence of operation for the
G67.
•
well ventilated or outdoor applications
•
power vent or induced draft application
On a call for heat from the system thermostat, the G67
ignition control simultaneously opens the pilot valve
and supplies a continuous spark to the pilot burner’s
electrode. When the pilot burner gas ignites, the pilot
flame sensor detects the pilot flame and signals the
G67 to energize the main gas valve and discontinue
the spark. The main gas valve will not be energized
until the flame sensor detects the presence of the pilot
flame.
The G67 is suitable for operation over a temperature
range of -40 to 66°C (-40 to 150°F). Consideration
must be given to the temperature of the surface on
which the G67 is mounted.
Use the G67B( ) only on rooftop, excess air, and power
vented gas burning equipment.
When using the G67, the appliance or equipment must
be approved by a recognized testing agency in
accordance with the applicable American National
Standards. See Specifications section. No other
application is permissible.
The G67 solid-state ignition control lights a pilot burner
by a spark. Pilot gas is ignited and burns during each
run cycle (intermittent pilot). Main burner and pilot gas
are extinguished during the Off cycle. All applications
must use a redundant main gas valve.
The main gas valve will not open until the pilot flame
has been proven by the sensing circuit. Should a loss
of flame occur, the main valve closes and the spark
recurs within 0.8 seconds.
O perating Mode Definitions
The following definitions describe operating conditions:
Trial for Ignition--Period during which the pilot valve
and spark are activated attempting to ignite gas at the
main burner.
Run--Main gas valve remains energized and the spark
is turned off after successful ignition.
Flameout--Loss of proven flame. Should a flameout
occur, the main valve closes and the spark recurs
within 0.8 seconds.
2 G67 Intermittent Pilot Ignition Controls Product Bulletin
If the pilot flame goes out (with the thermostat still
calling for heat), the G67 will de-energize the main gas
valve and provide a continuous spark at the pilot
burner’s electrode. When the pilot flame is re-ignited
and detected by the pilot flame sensor, the main gas
valve is energized and the spark is shut off. The G67
ignition control de-energizes the pilot gas valve and
main burner gas valve when the thermostat stops
calling for heat.
M ounting
Choose a location that provides the shortest, direct
cable route to the spark electrode, flame sensor
assembly. Easy access to the terminals is desired for
wiring and servicing. The G67 may be mounted in any
position.
For G67A and G67B, refer to Figures 4 through 6 for
wiring schematics/diagrams and Figure 7 for mounting
dimensions. For G67EG, refer to Figures 8 and 9 for
wiring schematic/diagram and Figure 10 for mounting
dimensions.
Thermostat
Call for Heat
Start
Yes
Flame
Present?
No
Trial for
Ignition
No
Pilot
Flame
Sensed?
Yes
Energize
Main Valve
Run
Flameout?
Yes
De-energize
Main Valve
No
Yes
Thermostat
Calling for
Heat?
No
De-energize Control
Pilot and Main Valves.
End
Figure 3: Sequence of Operation
G67 Intermittent Pilot Ignition Control Product Bulletin 3
Therm ostat
R
H igh Lim its
in this Line
O nly
W
Internal W iring
E xte rn a l W irin g
6
2
Q1
24 V A C
Input
R
R3
1
R2
R1
3
Q
S park
C ircuit
GR
S ensing
C ircuit
PV
MV
GR
P ilot
B urner
G round
Flam e
S ensor
GR
GR
5
Jum per
Figure 4: Wiring Schematic for G67 Self-Checking Control
Th erm o stat
W
Y
R
H ig h Lim its
in th is L in e
O nly
24
VA C
MV
P o w er
S u pp ly
PV
P ilo t
B u rne r
G ro un d
G ro un d
Term ina ls
Jum pe r
5
1
6
2
4
3
Flam e
S e nsor
H ig h Vo lta ge
C a ble
P o w er is w ired directly to R (C o m m o n) on th e
th erm o stat an d Te rm ina l 6 o n th e G 6 7.
Figure 5: Wiring Diagram for G67A( )
4 G67 Intermittent Pilot Ignition Controls Product Bulletin
4
Therm o stat
:
5
<
H igh Lim its
in this L ine
On ly
24
VA C
MV
PV
P ow er
S upply
P ilot
B urner
Grou nd
Grou nd
Te rm inals
Ju m per
5
1
2
3
4
Y 75
Flam e
S ensor
H igh Voltage
C able
P ow er is w ired directly to R (C om m on) on the therm osta t.
Term inals 1 and 2 on th e G 67 are tied together intern ally.
Figure 6: Wiring Diagram for G67B( )
8 .89
0 .35
S p ark Te rm ina l
fo r R a ja h C on ne ctor
2 2.6
0 .89
5 0.8
2 .00
6 7.5 6
2 .66
Tw o H o le s fo r
M ou ntin g S cre w s
6 .35 Q uick C on ne ct
0 .25 Term in a ls
4 .11
0 .16 2
1 04 .9
4 .13
11 5
4 .53
2 2.3
0 .88
56
2 .21
5 .33
0 .21
5 5.6
2 .19
5 .58
0 .22
Figure 7: G67(A and B) Mounting Dimensions, mm (in.)
G67 Intermittent Pilot Ignition Control Product Bulletin 5
Internal Wiring
External Wiring
High Limits in
this Line Only
6
Thermostat
R
2
W
K1a
24VAC
Input
K2
K2c
Flame
Sensor
1
K2b
K2a
3
K1
7
Spark
Circuit
MV
Chassis
PV
Sensing
Circuit
4
Spark
Gap
7
Burner
Ground
5
Jumper
Figure 8: Wiring Schematic for G67EG Self-Checking Control
Pilot Burner/
Spark Igniter
Main Burner
Ground
Flame
Sensor
Pilot Gas
Supply
CHASSIS
5
24V 7
COM
Transformer
THS 2
M.V. 3
MV
P.V. 1
24V 6
SENSE 4
PV
Limits in
Thermostat
Line Only
Thermostat
G67EG
Ignition Control
Figure 9: Wiring Diagram for G67EG
6 G67 Intermittent Pilot Ignition Controls Product Bulletin
Power
Supply
7 .87
0 .31
5 6.3 8
2 .22
5 7.9 1
2 .28
6 .35 S p ad e Te rm in als
0 .25
7 7.7 2
3 .06
3 3.7 8
1 .33
5 .58
0 .22
1 9.5 5
0 .77
1 07 .95
4 .25
11 6
4 .57
11 9.3 8
4 .70
Tw o H ole s
4 .1 fo r N o . 8 M ach in e
0 .16 2 o r N o . 6 S h ee t M e tal
M ou ntin g S cre w s
5 .58
0 .22
6 6.8
2 .63
5 0.8
2 .00
Figure 10: G67EG Mounting Dimensions, mm (in.)
G67 Intermittent Pilot Ignition Control Product Bulletin 7
O rdering Information
G 67 _ _ - _ _
Customer-specific Requirements
1st
Letter
A
Trial Time
Other
Features
Non-100% Lockout
Self Checking
B
Non-100% Lockout
Non-Self Checking
E
Non-100% Lockout
Self Checking/EC Approval
2nd
Letter
G
The presence of a particular construction in this information does not guarantee its availability.
Consult Johnson Controls for available constructions.
8 G67 Intermittent Pilot Ignition Controls Product Bulletin
Voltage
24V
60 Hz
Notes
G67 Intermittent Pilot Ignition Control Product Bulletin 9
Notes
10 G67 Intermittent Pilot Ignition Controls Product Bulletin
Notes
G67 Intermittent Pilot Ignition Control Product Bulletin 11
S pecifications
Product
Ignition Type
Ignition Source
G67 Non-100% Lockout Intermittent Pilot Ignition Control
Indirect
High voltage spark, capacitive discharge
Maximum High Voltage
Cable Length
1,220 mm (48 in.) recommended
Flame Detection Means
Flame rectification
Flame Detection Types
Remote sensing
Minimum Flame Current
0.2 microampere
Flame Failure Response
Time
0.8 second, maximum
Spark Gap
Ignition Trial Time
Power Requirements
Control
Operation Current
Contact Ratings
Main Valve
Pilot Valve
2.5 mm (0.1 in.) nominal
Infinite
24 VAC, 50/60 Hz, nominal
0.15A nominal + valves
2A continuous, 5A inrush
2A continuous, 5A inrush
Ambient Operating and
Storage Temperature
-40 to 66°C (-40 to 150°F)
Humidity
95% RH non-condensing
Types of Gas
Packaging
Bulk Pack Quantity
Bulk Pack Weight
Agency Listing
Specification Standards
Natural, Liquefied Petroleum (LP), manufactured, mixed, or LP gas-air mixture may be used in a
well-vented or outdoor application.
Bulk pack supplied to original equipment manufacturer (individual pack options).
50
12 kg (27 lb)
IAS (AGA, CGA) Certificate Number C2154020
EN/EC Type Examination Certificate Number 115687 (G67EG only)
ANSI Standard Z21.20
CSA C22.2-No. 199
EN 298 (G67EG only)
The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these
specifications, consult the local Johnson Controls office. Johnson Controls, Inc. shall not be liable for damages resulting from
misapplication or misuse of its products.
Refer to the G67 Series Technical Bulletins (LIT-121190 and LIT-121191) for necessary information on the installation, use, and servicing of this
product.
Controls Group
507 E. Michigan Street
P.O. Box 423
Milwaukee, WI 53201
12 G67 Intermittent Pilot Ignition Controls Product Bulletin
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FAN 435.0
Heating Line Product Guide
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