York PCG6B42 Installation Manual page 18

5285473-UIM-E-1217
START-UP
Phasing
CAUTION
!
Scroll compressors require proper rotation to operate properly. Fail-
ure to check and correct rotation may result in property damage.
NOTICE
Three-phase, scroll compressors operate in only one direction. If the
scroll is drawing low amperage, has similar suction and discharge
pressures, or is producing a high noise level, the scroll is misphased.
Check compressor rotation. If the scroll is misphased, change the
incoming line connection phasing to obtain the proper rotation.
FIGURE 9: Control Board
Operating Instructions
1. STOP! Read the information on the unit safety label.
2. Set the thermostat to the OFF position.
3. Turn off all electrical power to the unit.
4. DO NOT try to light the burners by hand. This appliance is
equipped with an ignition device which automatically lights the
burners.
5. Remove the access panel.
6. Turn the gas valve switch to the OFF position.
7. Wait five (5) minutes to clear out any gas. If you then smell gas,
STOP! Follow B in the information on the unit safety label. If you
don't smell gas, go to the next step.
8. Turn the gas valve switch to the ON position.
9. Replace the control access panel.
10. Turn on all electric power to the unit.
11. Set the thermostat to the desired setting.
12. If the unit still does not operate, follow the instructions To Turn Off
Gas To Appliance, and call service technician or gas supplier.
18
Prestart 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 outlet air hood and air intake hood has
been properly installed.
3. Set the airflow selection jumpers to the appropriate settings based
on external static pressures and heating temperature rise. See Fig-
ure 9.
To Turn Off Gas To Unit
1. Set the thermostat to the OFF position.
2. Turn off all electric power to the appliance if service is to be per-
formed.
3. Remove the control access panel.
4. Turn the gas valve switch to the OFF position. DO NOT FORCE.
5. Replace the control access panel.
Post Start Check List
After the entire control circuit has been energized and the heating sec-
tion 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 13.5", nor the operating pressure
drop below 4.5" for natural gas units. If gas pressure is outside
these limits, contact the local gas utility for corrective action.
Johnson Controls Unitary Products