31
RPB-IOM (06-22) 131782-B
OPERATION
⚠ WARNING ⚠
To ensure safety, follow the lighting instructions located on the outlet box cover.
Pre-Startup Checklist
Ensure that electrical supply is in accordance with voltage rating on unit’s rating plate.
Ensure that all field wiring is in accordance with wiring diagram and that wire gauges are as required for electrical
load.
Ensure that electrical entrances are sealed against the weather.
Ensure that fuses or circuit breakers are in place and are sized correctly.
Ensure that condensate drain holes in the corners of the cabinet are open.
Ensure that clearances from combustibles are in accordance with Clearances sections).
Check piping for leaks and proper gas line pressure and bleed trapped air from gas lines (refer to Supply Piping
Connections section):
a. Turn OFF manual shutoff valve.
b. Turn ON gas supply.
c. Observe gas meter for movement or attach pressure gauge readable to 0.1 IN WC and, after turning gas ON
for 10 seconds, turn OFF gas supply—no change in pressure should occur over 3-minute period.
d. If step c indicates leak, locate leak by brushing soapy solution on all fittings—bubbles will appear at any leaks.
e. Repair any leaks and repeat test.
Check to ensure that flue discharge openings are free from obstructions.
Startup
1. Close all panels tightly.
2. Turn ON electric and gas supply to furnace.
3. Adjust thermostat or ductstat so that call for heat exists.
4. Observe for complete sequencing of safety pilot and ignition (refer to Table 16).
Table 16. Sequence of Operation
Step Action Observe
1 Set thermostat at its lowest setting
2
Turn ON electric and main
and manual gas valves
Firing rate is controlled by thermostat
Blower motor operates from fan time delay
3
Set thermostat at desired
setting—thermostat calls for
heat
Venter motor is energized after 15-second (approximate) time delay
Venter flow switches from NC to NO contacts to energize pilot gas valve and spark gap to produce
pilot flame on each operating cycle
Sensing probe proves presence of pilot flame and energizes safety switch portion of control to
deenergize spark gap and energize main valve
Main gas ignites and unit fires at full rate
4
If flame is extinguished during
main burner operation, safety
switch closes main valve and
recycles spark gap
On unit equipped with controller with lockout, if pilot is not established within 120 seconds
(approximately), unit locks out for 1 hour unless reset by interrupting power to control circuit
To Next Page
Loading...
