Start-Up (Cooling); Prestart Checklist; Operating Instructions; Post Start Checklist - York ZF076 Installation Manual

5725848-XIM-A-0319

Start-up (cooling)

Prestart checklist

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 flow rate. See "CHECKING
SUPPLY AIR FLOW RATE" on page page 35.
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. Compressor will energize after the built-in time delay (five
minutes).

Post start checklist

1. Verify proper system pressures.
2. Measure the temperature drop across the evaporator coil.
3. Measure the system Amperage draw across all legs of 3
phase power wires.
4. Measure the condenser fan amp draw.

Shutting down the unit

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

Start up (gas heat)

Pre-start checklist
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.
42
Operating instructions
This furnace is equipped with an intermittent pilot and
automatic re-ignition system. DO NOT attempt to
manually light the pilot.
Lighting the 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).
Shutting down the unit
1. Turn "off" electric power to unit.
2. Depress knob of gas valve while turning to "off" position.

Post start checklist (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.
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warning exactly could result
in serious injury, death or property damage.
Never test for gas leaks with an open flame. use a
commercially available soap solution made specifically
for the detection of leaks to check all connections. A fire
or explosion may result causing property damage,
personal injury or loss of life.
2. Check for correct manifold gas pressures. See "Checking
Gas Input" on page page 43.
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 3.24
kPa (13.0"), nor the operating pressure drop below 1.25
kPa (5.0") for natural gas units. If gas pressure is outside
these limits, contact the local gas utility for corrective
action.
Johnson Controls Ducted Systems