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

Page 17
TABLE 10 - LIMIT CONTROL SETTING

 

 

 

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

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Image 17
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Contents SAFETY CONSIDERATIONS INSTALLATION INSTRUCTIONFOR YOUR SAFETY If you smell gas 1.Open windows FOR YOUR SAFETYINSTALLATION TABLE OF CONTENTSMAINTENANCE & TROUBLESHOOTING OPERATIONLIMITATIONS INSTALLATIONTABLE 1 - UNIT APPLICATION DATA LOCATIONDUCTWORK SERVICE ACCESSFIXED OUTDOOR AIR INTAKE DAMPER FIG. 3 - FIXED OUTDOOR AIR DAMPERFIG. 5 - TYPICAL FIELD WIRING CONTROL WIRE SIZESTHERMOSTAT POWER AND CONTROL WIRINGOPTIONAL ELECTRIC HEATERS DCE Models TABLE 2 - GAS HEAT APPLICATION DATAL.P. UNITS, TANKS AND PIPING DCG Models FIG. 7 - BOTTOM SUPPLY CONNECTIONEXTERNAL SHUT-OFF OPTIONAL ECONOMIZER/MOTORIZED DAMPER RAIN HOOD VENT AND COMBUSTION AIR HOODS DCG ModelsFIG. 8 - VENT AND COMBUSTION AIR HOODS Unitary Products Group FIG. 9 - ENTHALPY SETPOINT ADJUSTMENT530.18-N11Y TABLE 6 - ELECTRICAL DATA - UNITS w/ELECTRIC HEAT TABLE 4 - PHYSICAL DATATABLE 5 - ELECTRICAL DATA - BASIC UNITS Cont’d FIG. 10 - DIMENSIONS & CLEARANCES - DCE & DCGUTILITIES ENTRY DATA REAR VIEW ACCESSORY SIDE SUPPLY AND RETURN AIR OPENINGSDETAIL “X” DETAIL “Y” UNIT WITH RAIN HOODS6 POINT LOADS 4 POINT LOADSFIG. 11- FOUR AND SIX POINT LOADS TABLE 7 - FOUR AND SIX POINT LOADSTABLE 12 - BLOWER MOTOR AND DRIVE DATA TABLE 11 - POWER EXHAUST PERFORMANCETABLE 10 - STATIC RESISTANCES OPERATION SAFETY CONTROLSCOOLING SYSTEM PRELIMINARY OPERATION COOLINGHEAT ANTICIPATOR SETPOINTS TABLE 9 - HEAT ANTICIPATOR SETTINGGAS HEATING SEQUENCE OF OPERATION FIG. 12 - GAS VALVE PIPINGMANIFOLD GAS PRESSURE ADJUSTMENT TABLE 10 - LIMIT CONTROL SETTINGSTART-UP PRE-STARTCHECK LISTBURNER AIR SHUTTER ADJUSTMENT FIG. 15 - PROPER FLAME ADJUSTMENTFIG.17 - BELT ADJUSTMENT PILOT CHECKOUTTABLE 11 - GAS RATE - CUBIC FEET PER HOUR ADJUSTMENT OF TEMPERATURE RISECHECKING GAS INPUT FIG. 19 - TYPICAL FLUE BAFFLE INSTALLATION MAINTENANCENORMAL MAINTENANCE TROUBLESHOOTING TROUBLESHOOTING - Cont’d REPLACEMENT PARTS 530.18-N11Y Unitary Products GroupCode SBY
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D2CG300, D2CE specifications

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