Reznor HRPD (Outdoor Duct Furnaces) Unit Installation Manual - Manual (Page 24)

Form I-RP/HRPD, P/N 132210 R14, Page 24
9.0 Commissioning
and Startup
9.1 Check the
installation prior
to startup:
 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.
 Be certain that the electrical entrances are sealed against the weather.
 Check that fuses or circuit breakers are in place and sized correctly.
 Verify that the condensate drain holes in the corners of the cabinet are open.
 Check clearances from combustibles. Requirements are shown in Paragraph 4.2.
 Check piping for leaks and proper gas line pressure. Bleed gas lines of trapped air.
See Paragraph 6.1.
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.
 Check to make sure that flue discharge openings are free from obstructions.
9.2 Startup  Turn electric and gas supply on to the furnace. Adjust the thermostat or ductstat so
that a call for heat exists. Observe sequencing of safety pilot and ignition.
9.3 Check
Installation After
Startup
Operating Sequence
1) Set the thermostat switch at its lowest setting.
2) Turn on power, main and manual gas valves.
(a) Firing rate is controlled by the thermostat.
(b) Blower motor operates from fan time delay.
3) Set thermostat switch at desired setting.
4) 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.
5) If the flame is extinguished during main burner operation, the safety switch
closes the main valve and recycles the spark gap. On a unit equipped with
a controller with lockout, if the pilot is not established within 120 seconds
(approximately), the unit locks out for one hour, unless reset by interrupting the
power to the control circuit (See Lighting Instructions).
 With the unit in operation, measure manifold gas pressure. Manifold pressure for
natural gas should be 3.5" w.c. and 10" w.c. for propane gas. See Paragraph 6.1.
 Turn the unit off and on, pausing two minutes between each cycle. Observe
for smooth ignition. On two-stage or modulating burner systems, manipulate
temperature adjustment slowly up and down to see if control is sequencing or
modulating properly. Raising temperature setting drives burner on or to full fire.
 Observe burner flame at full fire. Natural gas flame should be about 1-1/2" in height
with blue coloring. Propane gas flame should be approximately the same length
with blue coloring. Yellow tipping may appear on propane gas. If yellow extends
beyond 1/2 to 3/4", adjust air shutters. See Paragraph 8.7.
 Close all panels tightly. With the heater on, check limit control by completely
blocking off distribution air. The limit control should open within a few minutes,
shutting off the gas supply to the main burners.
 Return all instruction forms and warranty information to the "Owner's Envelope".
Keep for future reference.