Reznor SC Duct Furnace Unit Installation Manual - Manual (Page 33)

Form I-SC, P/N 207696 R11, Page 33
9.2 Start-Up
 Close all panels tightly. Turn electric and gas supply on to the furnace. Adjust
the thermostat or ductstat so that a call for heat exists. Observe for complete
sequencing of safety pilot and ignition.
Operating Sequence
1. Set the thermostat switch at its lowest setting.
2. Turn on power.
3. Turn on the manual gas valves.
4. Set thermostat at desired setting.
5. Thermostat calls for heat
(a) The venter motor is energized after 15-second (approximate) time
delay.
(b) Venter flow switches from N.C. to N. O. contacts, energizing the pilot
gas valve and spark gap to produce a pilot flame on each operating
cycle. The sensing probe proves the presence of the pilot flame and
energizes the safety switch portion of the control. The switch action
de-energizes the spark gap and energizes the main valve. The main
gas ignites and the unit fires at full rate.
(c) If the flame is extinguished during main burner operation, the safety
switch closes the main valve and recycles the spark gap. On unit
equipped with a controller with lockout, if the pilot is not established
within 120 seconds (approximately), the unit locks out for one hour
or must be reset by interrupting the power to the control circuit (See
Lighting Instructions).
6. Blower motor operates from fan time delay.
7. Thermostat is satisfied.
(a) Solenoid gas valve de-energized.
(b) Pilot gas valve de-energized.
(c) Ignition controller de-energized.
(d) Time delay relay keeps venter motor on for approximately one minute
(post purge).
8. To shut down, set thermostat to lowest setting. Blower motor remains on as
determined by fan time delay.
9.1 Check the installation prior to start-up
 Verify suspension/mounting methods and clearances. See Paragraphs 4.1 and
5.0.
 Verify that the bolts removed from the shipping clips were returned to the heater
cabinet. See Paragraph 3.1.
 Check duct connections. See Paragraph 6.4.4.
 Check venting. See Paragraph 6.3. Be sure that flue discharge and combustion air
openings are free of obstructions.
 Be sure electrical entrance and gas supply pipe openings are sealed.
 If equipped, be sure that the condensate drain is open. See Paragraph 6.1.
Electrical Checks:

Be certain the electrical supply matches voltage rating of the furnace. (Refer to the
rating plate.)
 Check all field wiring against the wiring diagram. Be sure that wire gauges are as
required for the electrical load.
 Check that fuses or circuit breakers are in place and sized correctly.
Gas Supply Checks:

Check piping for leaks and proper gas line pressure. Bleed gas lines of trapped air.
See Paragraph 6.2.
a) Turn manual shutoff valve to off position.
b) Turn gas supply on.
c) Observe gas meter for movement, or
d) Attach pressure gauge readable to .1" w.c. and after turning gas on for ten
seconds, turn gas supply off. No change in pressure should occur over a three-
minute period.
e) If either c) or d) above indicate a leak, locate leak by brushing a soapy solution on
all fittings. Bubbles will appear at a leak. Repair and repeat tests.
9.0 Commissioning
and Start-Up