York D2CG300, D2CE Start-Up, Limit Control Setting, Pre-Startcheck List, Gasvalve And Controls

			530.18-N11Y
	TABLE 10 - LIMIT CONTROL SETTING
		Capacity, MBH	Limit Control
I G N . C O N T R O L # 2 Input		Output	Opens, ° F
	300	240	195
I G N . C O N T R O L # 1	400	320	195

	R O L L O U T S W .
S E N S O R # 1		G V 1
		G A S
		V A L	V E

G V 2
G A S		I G N I T O R
V A L V E
I G N I T O R	# 2	S E N S O R

HEAT ANTICIPATOR SETPOINTS

It is important that the anticipator setpoint be correct. Too high of a setting will result in longer heat cycles and a greater temperature swing in the conditioned space. Reducing the value below the correct setpoint will give shorter “ON” cycles and may result in the lowering of the temperture within the conditioned space.

# 1		Gas Valve	Anticipator Setpoint
			1st Stage	2nd Stage
	Honeywell VR8440		0.30 amp	0.11 amp
#	White2	-Rodgers 36C68

PRE-START CHECK LIST

Complete the following checks before starting the unit.

	1.	Check the type of gas being supplied. Be sure that it is the
B U R N E R	C O M P A RsameTasMlistedEon Nthe unitT nameplate.
FIG 13-GAS VALVE AND CONTROLS	2.	Make sure that the vent and combustion air hoods have been
		properly installed.

START-UP

6.Auxiliary Limit Switch (AUX) This control is located inside

the heat exchanger compartment and is set to open at 190° F. It is a manual reset switch. If AUX limit trips, then the primary limit has not functioned correctly., Replace the primary limit

OPERATING INSTRUCTIONS

CAUTION: This furnace is equipped with an intermittent pilot and automatic re-ignition system. DO NOT attempt to manually light the pilot.

TO LIGHT PILOT AND MAIN BURNERS:

1.Turn “off” electric power to unit.

2.Turn room thermostat to lowest setting.

3.Turn gas valve knob to “on” position.

4.Turn “on” electric power to unit.

5.Set room thermostat to desired temperature.

(If thermostat “set” temperature is above room temperature, pilot burner ignition will occur and, after an interval to prove pilot flame, main burners will ignite).

TO SHUT DOWN:

1.Turn “off” electric power to unit.

2.Depress knob of gas valve while turning to “off” position.

POST-START CHECK LIST (GAS)

After the entire control circuit has been energized and the heating section is operating, make the following checks:

1.Check for gas leaks in the unit piping as well as the supply piping.

2.Check for correct manifold gas pressures. See “Checking Gas Input”.

3.Check the supply gas pressure. It must be within the limits shown on rating nameplate. Supply pressure should be checked with all gas appliances in the building at full fire. At no time should the standby gas line pressure exceed 13", nor the operating pressure drop below 5.0" for natural gas units. If gas pressure is outside these limits, contact the

ON-OFF CONTROL

HIGH FIRE ADJ. (UNDER SCREW)

PILOT ADJ. (UNDER SCREW)

FIG. 14 - TYPICAL GAS VALVE

local gas utility for corrective action.

MANIFOLD GAS PRESSURE ADJUSTMENT

Small adjustments to the high-fire gas flow may be made by turning the pressure regulator adjusting screw on the automatic gas valve. Refer to figure below.

Adjust as follows:

1.Remove the cap on the regulator. It’s located next to the push-on electrical terminals.

2.To decrease the gas pressure, turn the adjusting screw counterclockwise.

Unitary Products Group 17