Condensing Units
CU/CFCU
Condensing Units
27
Installation & Maintenance Manual : 6259626 IM V1.6.0 04/16
Maintenance
IMPORTANT
The equipment contains live electrical and moving parts, isolate all electrical equipment
before any work is carried out.
ACCESS
Access to the compressor and control panel area is gained by removing the securing
screws from the cover of the condensing unit casing and lifting the cover off.
Access is gained to the fan(s) through the top of the unit by removing the top cover.
MAINTENANCE SCHEDULE
3 MONTHS
At every service visit the following checks should be carried out:-
Fan & Motor Assembly
CU./CUH. 1-12
1
Examine the fan and motor assembly for lateral and end play in the bearings.
2
Examine the electrical gland plate to ensure that no water is entering the motor.
3
Examine the fan blades for damage and corrosion.
CFCUS5 - 10
Check condition, tension and alignment of drive belt(s). Adjust or replace as necessary.
Lubricate damper pivots if required.
Refrigeration Circuits
1
Visually examine pipework and components for damage, wear and tear and oil
patches, the latter being indicative of a system leak.
2
Check the suction and discharge pressures using a service gauge manifold and
compare them with the commissioning sheet. If there is any significant variation,
then the fault should be found and corrected. Refer to
Troubleshooting
.
3
Check that the high and low pressure switches (if fitted) are cutting out the
compressor(s) at the commissioned settings.
4
Ensure the fan head pressure controller is controlling the head pressure at the
required setting as indicated on the commissioning sheets provided.
The gauges can then be removed from the system. Do not forget to replace the security
caps on the Schrader valves.
Condenser coil
Clean the condenser coil with a stiff bristled hand brush. If dirt has accumulated over a
long period, or tends to be greasy or sticky, then it may be necessary to use a water hose
or chemical pressure hose. Take care not to damage the fins and comb out if they have
become damaged in any way.
IMPORTANT
Do not use steam for cleaning condenser coils otherwise damage or danger may result
from excessive internal pressures
Cabinet
Wash down cabinet using a mild detergent. Treat any paint damage or rust as necessary.
Electrical
1
Check all electrical connections for signs of overheating or arcing.
2
Check all cables for signs of chafing or physical damage.
12 MONTHS
As per 3 months plus:
1
Check all electrical connections for security.
2
Check all refrigeration connections with a leak detector.
