G Gas Combustion Combination Controls and Systems—G891 Pulse Ignition Control 5
!
WARNING:
Fire or Explosion Hazard. If the control is
installed in an area that is exposed to water
(dripping, spraying, rain, etc.) it must be protected.
If the control has been exposed to water in any way,
do not use it.
Choose a location with the shortest direct cable route to the spark igniter
and flame sensor. Refer to Figure 2 for mounting dimensions. Use
four No. 8 machine or No. 6 sheet metal screws through the mounting
holes in the enclosure.
g891mtg.drw
G891 Control
6.20 in.
6.76 in.
4.00 in.
4.56 in.
Figure 2: Mounting Dimensions
!
WARNING: Shock Hazard. Disconnect power supply before
modifying wiring to prevent electrical shock or
equipment damage.
Check the voltage rating marked on the control or in Table 1 to be sure it
is suited to the application. Use an NEC Class 2 transformer, such as a
Johnson Controls Y65, to provide 24 VAC under maximum load,
including the valve.
All wiring should be in accordance with the National Electrical Code and
all other local codes and regulations. The high voltage spark cable must
not be in continuous contact with a metal surface. Use standoff insulators.
Be certain the flame sensor wire and the high voltage spark cable are
separated from one another by a minimum of 1/4 inch, and not wrapped
around any pipe, other wiring, or accessories.
The schematic in Figure 3 shows a typical wiring hookup for the G891.
Connections such as the gas valve, thermostat input, and inducer motor are
connected to the control with a keyed plug connector. All limit and
operating controls must be located in series with the thermostat.
Mounting
Wiring
