20
OPERATING CHECK LIST
GENERAL
Cheek for any unusual noises or vibration in the running components, particularly at the main blower.
PHASE ROTATION PROTECTION
If the phase at the power supply are not correct, the phase rotation protection device will prevent the machine
from starting.
ELECTRICAL
SET POINTS
Set point of compressor current overload relay.
1.
Set point of indoor blower motor current overload relay.
2.
NOTE : The outdoor blower motor is equiped with an internal current overload safety device with automatic
reset.
OPERATING VOLTAGE:
Recheck voltage at unit supply terminals.
CONTROL
Operate system and thermostat switches.
1.
Check unit is wired for correct control of blower, cooling and heating modes.
2.
Verify all sensor signal, using the controller display.
3.
BLOWER & DRIVE
Check that the pulleys on both blower shaft and motor are correctly fastened to the bush and rotate
1.
without wobbling.
Check the alignment of the pulleys.
2.
Cheek externaly the rotation direction of the blower.
3.
Static Pressure and Air volum in the supply and return air ducts.
4.
The indoor air quantity must be within the application limits of the main blower (see performances
5.
curves). The associated static pressure must be such that the motor is operating within its normal
amper rating. With all panels in place measure current on each phase of the indoor blower motor
using clip-on type ammeter. Compare the amperage to the nameplate full load current.
COMPRESSOR AND REFRIGERATION SYSTEM
If outdoor air temperature is below 0°C make sure that the compressor crankcase heater has been
1.
on for at least one hour before starting compressor.
Running check: Start the compressor. Check for any unusual noise or vibration.
2.
Operating Pressures: Operate the unit for at last 20 minutes and ensure that the refrigerant pressures
3.
are stabilised, and cheek that they are within the normal operating ranges.
Operating Temperature: Check discharge, suction and liquid temperatures.
4.
Discharge temperature on cooling cycle should normally not exceed 105°C.
5.
Suction superheat should between 5°K and 12°K.
6.
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