Reznor SCE Unit Installation Manual Manual do Utilizador descarregar pdf (Página 31)

Form RZ-NA I-SCE, Mfg #207697 Rev 7, Page 31

Check installation

after startup:

Observe burner ame at full re. Natural gas ame should be about 1-1/2" in height with blue

coloring. Propane gas ame 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 24. If shutter adjustment will not reduce yellowing, check for gas

leaks at the control manifold or orice tting.

Turn the unit o 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 re.

Using a manometer or slant gauge readable up to 14" w.c., check orice manifold for

operating pressure on full re. Natural gas should be 3.5" w.c. at this point. Propane gas

should be 10" w.c. at this point. Variations from these pressures are not recommended, as

ignition and eciency performance can be adversely aected by improper pressure

adjustment. See Paragraph 10.

If the system is equipped with an optional dirty lter switch, set the switch. Follow the

instructions in Paragraph 27A.

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.

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 ow switches from N.C. to N. O. contacts, energizing the pilot gas valve

and spark gap to produce a pilot ame on each operating cycle. The sensing probe

proves the presence of the pilot ame 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 res at full rate.

the main valve and recycles the spark gap. On unit equipped with a G770NGC-4

controller which includes lockout control, if the pilot is not established within 120

seconds (approximately), the unit locks out and 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 satised.

(a) Solenoid gas valve de-energized.

(b) Pilot gas valve 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.

DANGER: The gas burner in this gas-red equipment is designed and equipped to provide safe, controlled

complete combustion. However, if the installation does not permit the burner to receive the proper supply

of combustion air, complete combustion may not occur. The result is incomplete combustion which produces

carbon monoxide, a poisonous gas that can cause death.

Safe operation of separated-combustion, indirect-

red gas burning equipment requires a sealed, properly operating vent system which vents all ue products

to the outside atmosphere. FAILURE TO PROVIDE PROPER VENTING WILL RESULT IN A HEALTH

HAZARD WHICH COULD CAUSE SERIOUS PERSONAL INJURY OR DEATH.

Install either the horizontal or vertical combustion air/vent system illustrated in Paragraph 9 using the

concentric adapter supplied. Always comply with the combustion air requirements in the installation codes

and instructions. Combustion air at the burner should be regulated only by manufacturer-provided

equipment. NEVER RESTRICT OR OTHERWISE ALTER THE SUPPLY OF COMBUSTION AIR TO

ANY HEATER. CHECK THE COMBUSTION AIR/VENT SYSTEM FOR SOUNDNESS AND

FUNCTION; MAINTAIN IT IN PROPER OPERATING CONDITION.

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