Roof Top Units
HA / 34 /45 /52 /61 / 75 / 89 / 110 RC
Roof Top Unit
13
(c)
Fan Drive.
(i)
Pulley adjustment correct for expected air quantity and static pressure.
(ii)
Belt tension correct.
(d)
Check that the Biloc Sheaves on both the fan shaft and the motor are correctly fitted to the bush and
rotate without wobble.
(i)
Ensure that the motor is securely bolted to the mounting plate square to the fan shaft.
(ii)
Using a string line or straight edge ensure that the pulley grooves are correctly aligned.
(e)
Improper alignment of the pulleys and belt may cause vibration in the fan drive and result in prema-
ture wear.
COMMISSIONING
(CONTINUED)
2. OPERATING CHECK LIST
PLEASE NOTE: Read the electronic controls options for CAC controller manual before proceeding.
Read the electronic controls option for CAC controler before proceeding
PLEASE NOTE
2.1 Indoor Fan & Drive
(a)
Check that the Biloc Sheaves on both the fan shaft and the motor are correctly fitted to the bush and
rotate without wobble.
(b)
Rotation: Cheek direction of rotation.
(c)
Static Pressure Loss and Air Quantity
(d)
The indoor air quantity must be within the application limits of the unit supply air fan (see fan curves).
The associated static pressure must be such that the motor is operating within its normal power rating.
With all panels in place measure current in each phase of the indoor fan motor using clip-on type
ammeter. Compare this to the nameplate full load current.
2.2 Outdoor Fan
(a)
Clearance: Spin fan by hand and check clearance.
(b)
Rotation: Start fan motor and check direction of rotation.
2.3 Compressor and Refrigeration System
(a)
If outdoor air temperature is below zero make sure that the compressor sump heater has been on for at
least one hour before starting compressor.
(b)
Running check: Start the compressor. Check for any unusual noise and vibration.
(c)
Operating Pressures: Operate the unit for a minimum of 20 minutes to ensure that the refrigerant pres-
sures have stabilised, and check that they are within normal operating limits.
(d)
Operating Temperature: Check discharge, suction and liquid temperatures.
(e)
Discharge temperature on cooling cycle should normally not exceed 95C.
(f)
Suction superheat should be 6°C ± 2°C.
(g)
Liquid should be sub-cooled.
2.4 General
(a)
Cheek for any unusual noises or vibration in the running components, particularly the indoor fan drive
system.
2.5 Protective Devices
(a)
High Pressure Switch.
(b)
low Pressure Switch.
