356214-XIM-A-0108

IGN.CONTROL#2

IGN.CONTROL#1

 

ROLLOUTSW.

SENSOR#1

GV1

 

 

GAS

 

VALVE

GV2

 

GAS

IGNITOR#1

VALVE

 

START-UP (COOLING)

PRESTART CHECK LIST

After installation has been completed:

1.

Check the electrical supply voltage being supplied.

 

Be sure that it is the same as listed on the unit

 

nameplate.

2.

Set the room thermostat to the off position.

3.

Turn unit electrical power on.

4.

Set the room thermostat fan switch to on.

IGNITOR#2

SENSOR#2

BURNERCOMPARTMENT

FIGURE 20 - GAS VALVE AND CONTROLS

FLASH CODES

The UCB will initiate a flash code associated with errors within the system. Refer to UNIT CONTROL BOARD FLASH CODES Table 24.

RESETS

Remove the call for heating by lowering the thermostat setting lower than the conditioned space temperature. This resets any flash codes.

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 low- ering of the temperature within the conditioned space.

TABLE 22: GAS HEAT ANTICIPATOR SETPOINTS

Gas Valve

Anticipator Setpoint

 

 

1st Stage

2nd Stage

 

 

 

 

Honeywell VR8440

0.30 amp

0.11 amp

 

White-Rodgers 36C68

 

 

 

 

 

5.

Check indoor blower rotation.

 

• If blower rotation is in the wrong direction. Refer to

 

Phasing Section in general information section.

 

• Check blower drive belt tension.

6.

Check the unit supply air (CFM). See "CHECKING

 

SUPPLY AIR CFM" on page 34.

7.

Measure evaporator fan motor's amp draw.

8.

Set the room thermostat fan switch to off.

9.

Turn unit electrical power off.

OPERATING INSTRUCTIONS

1.Turn unit electrical power on.

2.Set the room thermostat setting to lower than the room temperature.

3.First stage compressors will energize after the built-in time delay (five minutes).

4.The second stage of the thermostat will energize second stage compressor if needed.

POST START CHECK LIST

1.Verify proper system pressures for both circuits.

2.Measure the temperature drop across the evapora- tor coil.

42

Johnson Controls Unitary Products

Page 42
Image 42
Sunlife Enterprises DM300, DM240, DM180 installation manual START-UP Cooling

DM300, DM240, DM180 specifications

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