Reznor EEDU Unit Installation Manual - Manual (Page 25)

Form I-EEDU, P/N 150492 R6, Page 25
9.0 Commissioning
and Startup
9.1 Check the installation prior to startup:
 Check suspension. Unit must be secure and level.
 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 wire gauges are as
required for the electrical load. Verify that fuses or circuit breakers are in place and
sized correctly.
 Check clearances from combustibles. Requirements are shown in Paragraph 4.2.
 If installed in a confined space, verify that the furnace has adequate combustion
air supply. See Paragraph 2.2.
 Check vent system to be sure that it is installed according to the instructions in
Paragraph 6.2.
 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 leak-detecting
solution on all fittings. Bubbles will appear at a leak. Repair and repeat tests.
9.2 Startup:
Operating Sequence
1. Set thermostat at lowest setting
2. Turn on the power to the unit.
3. Turn on main and pilot manual gas valve.
4. Set thermostat at desired setting.
5. Thermostat calls for heat energizing the venter motor.
6. Pressure switch closes, energizing the pilot gas
valve and spark gap to produce a pilot flame on
each operating cycle. The sensing probe proves
the presence of pilot flame and energizes the safety
switch portion of the control. The switch action
de-energizes the spark gap and energizes the main
gas valve.
7. Fan control (Optional) senses heat exchanger
temperature energizing the fan or blower motor of the
air handler.
8. If the pilot flame is extinguished during main burner
operation, the sensing probe detects the absence of
the flame and causes the safety switch to close the
main valve. On units with standard intermittent spark
pilot systems, the spark gap recycles. On units with
optional spark ignition with lockout, if the pilot is not
established within the timing cycle (approximately
120 seconds), the unit locks out and must be reset by
interrupting power to the control circuit.
 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.
9.3 Check
installation after
startup:
 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 8.6.2 .
 Checked the limit control. With the heater on, completely block off distribution air.
The limit control should open within a few minutes, shutting off the gas supply to
the main burners.
 Place "Owner's Envelope" containing Limited Warranty Card, this booklet, and
any optional information in an accessible location near the heater. Follow the
instructions on the envelope.