Heat Anticipator Setpoints; Start-Up (Cooling); Prestart Check List; Operating Instructions - York 20 Series Installation Manual

349215-JIM-B-1008

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 25: GAS HEAT ANTICIPATOR SETPOINTS
Gas Valve
VR8440
36C68

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 informa-
tion section.
• Check blower drive belt tension.
6. Check the unit supply air (CFM). See "CHECKING
SUPPLY AIR CFM" on page 44.
7. Measure evaporator fan motor's amp draw.
8. Set the room thermostat fan switch to off.
9. Turn unit electrical power off.
Johnson Controls Unitary Products
Anticipator Setpoint
1st Stage 2nd Stage
0.30 amp 0.11 amp

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.
3. Measure the system Amperage draw across all
legs of 3 phase power wires.
4. Measure the condenser fan amp draw.

SHUT DOWN

1. Set the thermostat to highest temperature setting.
2. Turn off the electrical power to the unit.

START-UP (GAS HEAT)

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.
53