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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.

( I f  t he r mo s ta t   “s e t”   te m pe ra tu re   is   ab o ve   ro om
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
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 15.

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.

3. To increase the gas pressure, turn the adjusting screw

clockwise.

NOTE: The correct manifold pressure for these furnaces is

3.65 IWG 

±

0.3.

FIG 12-GAS VALVE AND CONTROLS

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.

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

same as listed on the unit nameplate.

2. Make sure that the vent and combustion air hoods have

been properly installed.

Gas Valve

Anticipator Setpoint

1st Stage

2nd Stage

Honeywell VR8440

0.30 amp

0.11 amp

White-Rodgers 36C68

START-UP

ON-OFF CONTROL

HIGH FIRE ADJ.
(UNDER SCREW)

PILOT ADJ.
(UNDER SCREW)

FIG. 13 - TYPICAL GAS VALVE

530.18-N11Y

Unitary Products Group

17

Summary of Contents for D1CE

Page 1: ...6 1V Propane Conversion Accessory 530 18 N6 2V High Altitude Accessory Nat Gas 530 18 N6 3V High Altitude Accessory Propane Renewal Parts Refer to the Renewal Parts Manual for complete listing of repl...

Page 2: ...trical Data Basic Units 10 6 Electrical Data Units With Elec Heat 10 7 Supply Air Blower Performance 13 8 Static Resistances 14 9 Power Exhaust Performance 14 10 Blower Motor and Drive Data 14 11 Heat...

Page 3: ...talled on a solid level roof curb or appropriate angle iron frame CAUTION If a unit is to be installed on a roof curb or special frame other than a YORK roof curb gasketing must be applied to all surf...

Page 4: ...uctwork to accommodate the damper Using the holes in the hood flanges as a template drill 9 64 dia 26 drill holes into the ductwork and secure with the screws provided CAUTION If outdoor air intake wi...

Page 5: ...FIG 5 TYPICAL FIELD WIRING Wire Size 1 AWG Gauge 22 20 19 18 16 40 120 150 190 305 Maximum Wire Length2 Feet Notes 1 Solid Class II copper wire CONTROL WIRE SIZES 530 18 N11Y Unitary Products Group 5...

Page 6: ...ons and to Table 6 for electrical data COMBUSTION DISCHARGE DCG Models The products of combustion are discharged horizontally through two screened hooded openings on the upper gas heat access panel GA...

Page 7: ...ediately upstream of the gas supply connection to the furnace L P UNITS TANKS AND PIPING DCG Models All gas heat units are shipped from the factory equipped for natural gas use only The unit may be co...

Page 8: ...but do not remove the two panel latches CAUTION Extreme care must be exercised in turning both the setpoint and minimum position adjusting screws to prevent twisting them off 1 The enthalpy set point...

Page 9: ...FIG 9 ENTHALPY SETPOINT ADJUSTMENT 530 18 N11Y Unitary Products Group 9...

Page 10: ...breaker 2 Although these sizes are based on 75 C copper conductors aluminum wire can be used Refer to the National Electric Code in U S A or the current Canadian Electrical Code in Canada to determine...

Page 11: ...be provided between any combustible material and the supply air ductwork for a distance of 3 feet from the unit The products of combustion must not be allowed to accumulate within a confined space an...

Page 12: ...sheet metal covers except when the unit includes a power exhaust option The covering consists of a heavy black paper composition 3 Replace the side supply and return air compartment panels For side du...

Page 13: ...12 2 2 0 16 6 13 9 HIGH SPEED DRIVE ACCESSORY 1118 6 0 2 3 8 8 7 4 1 8 10 3 8 6 1 3 11 9 10 0 0 7 13 6 11 4 0 2 15 4 12 9 1170 5 0 2 7 9 4 7 9 2 2 11 0 9 2 1 7 12 7 10 6 1 1 14 5 12 2 0 5 16 4 13 7 12...

Page 14: ...pulley below 1 turn open MOTOR SPEED STATIC RESISTANCE OF RETURN DUCTWORK IWG 0 2 0 3 0 4 0 5 0 6 CFM KW CFM KW CFM KW CFM KW CFM KW HIGH 5250 0 83 4500 0 85 4200 0 88 3750 0 93 3000 0 99 MEDIUM 4900...

Page 15: ...operate if the fan switch on the room thermostat is set in the ON position ECONOMIZER WITH DUAL ENTHALPY SENSORS The operation with the dual enthalpy sensors is identical to the single sensor except t...

Page 16: ...and the main gas valve opened Gas flows into each of the second stage main burners and is ignited from the carryover tube flame If IC2 fails to detect a pilot flame it will continue to try for a maxi...

Page 17: ...e these limits contact the 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...

Page 18: ...resistances of both the supply and the return air duct systems With this information the RPM for the supply air blower and themotor pulley adjustment turns open can bedeterminedfrom the blower perform...

Page 19: ...and drive data CHECKING GAS INPUT NATURAL GAS 1 Turn off all other gas appliances connected to the gas meter 2 With the furnace turned on measure the time needed for one revolution of the hand on the...

Page 20: ...tructed by overhanging structures of shrubs GAS HEATING UNITS BURNER PILOT Periodically at least annually at the beginning of each heating season make a visual check of the pilot and main burner flame...

Page 21: ...go to Step f If it does not check to see if line voltage is being supplied to the contacts of the contactor 3M and if the contactor is pulled in Check for loose wiring b If contactor 3M is pulled in p...

Page 22: ...ILOT CHECKOUT b Check all wiring between the ignitor control and the gas valve Check to make sure the ground connections are intact c If the wiring is intact check for 24 volts across terminals PV and...

Page 23: ...530 18 N11Y Unitary Products Group 23...

Page 24: ...ary Products Group P O Box 1592 York Pennsylvania USA 17405 1592 Subject to change without notice Printed in U S A Copyright by York International Corporation 1995 All Rights Reserved Code SBY 530 18...

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