Universal Chilling Systems, LLC.
7
Manual
Model 10
Air Cooled Chiller
5.
Commissioning
5.1. Check before Start Operation
A.
Check the environment that everything is normal
.
B.
Check the power supply connection and the power supply to be sure the phase voltage conforms to the
requirement.
C.
Check the water valves on the chiller water pipelines to be sure it is opened. Check the pumps are
normal after pressure test, dirt discharge, air discharge and trial operation.
D.
Check the water level in the water vessel, the connection of the water supplementary inlet to the vessel,
overflowing outlet is connected to the sewer.
5.2. Operation of Chilled Water System
A.
The chilled water need to be processed, to keep the PH value between 7.0-8.5. The higher alkalinity may
accelerate the corrosion of the copper pipes, decrease the use time of the heat exchangers.
B.
After the unit and auxiliary facility are fixed, the water lines need to be processed for pipe cleaning,
pressure test, air discharge, trial running of chilled water system etc. The unit commissioning and trial running
can be started after confirmation of all is normal.
C.
Operation of the unit
a.
Over 12 hours of power supply on to the unit is needed before the unit start.
b.
Start order for the air cooled unit: chilled water pumps
unit;
c.
Stop order for the air cooled unit: unit
chilled water pumps;
D.
After start, judge the operation status by observing the high and low pressure gauges. The normal range
of the high pressure is 8-16kg/cm2, the low pressure range is 1.5-4kg/cm2
a.
For the air cooled unit, observe the rotation direction of the fans, if it runs in wrong direction,
change the power supply wire connection to correct it before start.
b.
The set value of all protection devices must not be changed, they have been set at correct value
before delivery.
c.
In case the error alarm is on and the unit is stopped, first press the stop button, the alarm will go
off, and then check the trouble reason. Do not start forcibly before the trouble is eliminated.
d.
Do not stop the unit by cut off the main power supply unless in emergency case. If the unit
needs to be stop for long time in winter, stop the unit first, then cut off the main power supply, and
drain the water in the system.
e.
To guarantee the normal and stable operation of the unit, keep clean, tidy, and air flow in the
machine rooms; clean the condensers periodically.
5.3.
Maintenance
A.
Keep the clean of the condensers, clean it periodically and good air flow condition.
B.
Clean the condensers after a period of operation, especially for the dirty environment and the H/L
differential pressure acts and refrigeration capacity deceased.
