Start-Up (Cooling); Start-Up (Gas Heat); Gas Heat Anticipator Setpoints - York ZJ078 Installation Manual

524581-YIM-I-0512
Flash Codes
The ICB will initiate a flash code associated with errors within
the system. Refer to IGNITION CONTROL FLASH CODES
Table 30.
Resets
Remove the call for heating by lowering the thermostat setting
lower than the conditioned space temperature. This resets any
flash codes.

Gas 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 temperature within the
conditioned space. Refer to Table 25 for the required gas heat
anticipator setting.
Table 25: Gas Heat Anticipator Setpoints
SETTING, AMPS
W1
0.65

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.
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).
7. Measure evaporator fan motor's amp draw.
8. Set the room thermostat fan switch to off.
9. Turn unit electrical power off.
56
Operating Instructions
1.
NOTE: Prior to each cooling season, the crankcase heaters
2.
3.
4.
Post Start Check List
1.
2.

Start-Up (Gas Heat)

Pre-Start Check List
W2
Complete the following checks before starting the unit.
0.1
1.
2.
Operating Instructions
This furnace is equipped with an automatic re-ignition
system. DO NOT attempt to manually light the pilot.
Lighting The Main Burners
1.
2.
3.
4.
5.
Turn unit electrical power on.
must be energized at least 10 hours before the system
is put into operation.
Set the room thermostat setting to lower than the room
temperature.
First stage compressors will energize after the built-in time
delay (five minutes).
The second stage of the thermostat will energize second
stage compressor if needed.
Verify proper system pressures for both circuits.
Measure the temperature drop across the evaporator coil.
Check the type of gas being supplied. Be sure that it is the
same as listed on the unit nameplate.
Make sure that the vent outlet and combustion air inlet are
free of any debris or obstruction.
Turn "OFF" electric power to unit.
Turn room thermostat to lowest setting.
Turn gas valve counter-clockwise to "ON" position (See
Figure 35).
Turn "ON" electric power to unit.
If thermostat set temperature is above room temperature,
the main burners will ignite. If a second stage of heat is
called for, the main burners for second stage heat will
ignite for the second stage heat.
Johnson Controls Unitary Products