Trane WCVS 12H, Installation Operation & Maintenance

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TRANE ®
Operation / Start-Up
8
Start-up
Before Start-up, confirm the following:
1. Isolator spacers at compressor
base if any, had been removed.
2. Ensure sufficient cooling load is
available at the day of start-up (Min
50% design load).
3. Check if duct is firmly connected to
the fan discharge with a flexible
duct. The flexible duct must be
loose.
4. Check and ensure that the
balancing dampers are opened.
5. Water piping system must be
properly installed and filled with
clean water.
6. Check the condition and tension of
the fan belts.
7. Compressor oil should be visible
in the sight glass.
8. Check voltage at all compressor
terminals.
9. Check voltage imbalance.
Maximum allowable voltage
imbalance, phase to phase is 2%.
10. Check phase rotation with a phase
meter. The phase rotation for all
multiple scroll compressors are the
same (clockwise direction L1-L2-
L3). Please refer figure 6 for details.
WARNING: Do not jumper low-
pressure cut-out during start-up.
Failure in observing this warning may
result in compressor failure due to
starting at low suction pressure.
Note: All units do not have liquid
solenoid valves. Liquid solenoid
valves are not required nor
recommended.
To Start Unit
1. Turn on the unit power switch.
2. Turn on the condenser water supply.
3. Check the fan for direction of rotation.
4. Turn the Zone Sensor Thumbwheel
to desired temperature setting.
Operation
Unit start/stop controls are provided on
the facia of the unit-mounted control
box.
Unit is operated by, pressing the
“START” botton while the ‘H-O-A’
selector switch in H (Hand / Manual)
mode. Please ensure there are at least
50% design load.
To interrupt unit operation, press the
“STOP” button.
Seasonal Start-up
Procedure.
1.
2.
3.
4.
5.
6.
7.
Maintenance
The following maintenance procedures
are given as an essential part of the
required maintenance of this
equipment. However, the services of a
qualified service technician are
required to perform the periodic
maintenance procedures as a part of
a regular maintenance contract.
Note: Normal oil level on the
manifolded compressors could be
any where from low to 3/4
th . of the
oil sight glass. Add oil only if oil level
is not visible in the sight glass.
Perform the applicable procedures
outlined under
“
Annual maintenance
”
in the Maintenance section.
Test the entire refrigerant system for
leaks.
Start the system.
Check the operation of all interlocked
equipments.
Check the compressor oil level and
system operating pressures after the
system has stabilized (About 15 to
20 minutes).
Observe the flow of refrigerant
through sight-glass. If bubbles
appear, re-check the system for
leaks.
Check for adequate subcooling.
WARNING: Disconnect power
source and allow all rotating
equipment to stop completely before
servicing or inspecting the unit.
Failure to do so many result in injury
or death.