START UP PROCEDURES
The water system, the gas system and the
electrical system for the heater should be
completed and checked as per the heater
installation manual and associated documents.
1. Turn on power to the heater with the manual
main gas valve and pilot gas valve off. The
electric power supply requirements are:
• Dual-voltage fan motor.
120/240 volt 60Hz 1.0/1.95 Amp fan
motor for appliance sizes 181-401.
2. Check power connections.
3. Close heater power switch.
4. Set operating control to call for heat.
a. Fan motor starts, draft proving switch
closes.
b. Heater pump starts, flow switch closes.
c. Ignition module energized.
d. Check for spark at gas pilot.
5. Turn operating control to end call for heat.
6. Wait a minimum of 60 seconds.
7. Open pilot gas valve.
a. Repeat procedure outlined in #4 above.
8. After pilot gas is proven and main safety
shut-off valve is energized.
- Main burners will ignite.
9. Heater will operate until call for heat is
satisfied.
11.Restart unit and visually check all compo-
nents for proper operation.
12.Check all vent connections and joints for
leakage. Correct if found.
13.To restart unit after a failure, follow the
procedures outlined above and other subse-
quent or related sections outlined in the heater
manual.
EMERGENCY SHUTDOWN
SHUT OFF ALL POWER AND GAS, CALL
GAS UTILITY.
12
DRAFT PROVING SWITCH
The draft proving switch insures that the
blower is operating. The switch is in the limit
circuit and does not allow the ignition module
to operate unless it is closed.
FIG #9359
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