BEFORE INITIAL START-UP
Job Data Required
• list of applicable design temperatures and pressures (prod-
uct data submittal)
• chiller certified prints
• starting equipment details and wiring diagrams
• diagrams and instructions for special controls or options
• 19XR Installation Instructions
• pumpout unit instructions
Equipment Required
• mechanic’s tools (refrigeration)
• digital volt-ohmmeter (DVM)
• clamp-on ammeter
• electronic leak detector
• absolute pressure manometer or wet-bulb vacuum indica-
tor (Fig. 24)
• 500-v insulation tester (megohmmeter) for compressor
motors with nameplate voltage of 600 v or less, or a
5000-v insulation tester for compressor motor rated above
600 v
Using the Optional Storage Tank and Pumpout
System —
Refer to Chillers with Storage Tanks section,
page 63 for pumpout system preparation, refrigerant trans-
fer, and chiller evacuation.
Remove Shipping Packaging — Remove any pack-
aging material from the control center, power panel, guide
vane actuator, motor cooling and oil reclaim solenoids,
motor and bearing temperature sensor covers, and the factory-
mounted starter.
Open Oil Circuit Valves — Check to ensure the oil
filter isolation valves (Fig. 4) are open by removing the valve
cap and checking the valve stem.
Tighten All Gasketed Joints and Guide Vane
Shaft Packing —
Gaskets and packing normally relax
by the time the chiller arrives at the jobsite. Tighten all gas-
keted joints and the guide vane shaft packing to ensure a
leak-tight chiller.
Check Chiller Tightness — Figure 25 outlines the
proper sequence and procedures for leak testing.
19XR chillers are shipped with the refrigerant contained
in the condenser shell and the oil charge in the compressor.
The cooler is shipped with a 15 psig (103 kPa) refrigerant
charge. Units may be ordered with the refrigerant shipped
separately, along with a 15 psig (103 kPa) nitrogen-holding
charge in each vessel.
To determine if there are any leaks, the chiller should
be charged with refrigerant. Use an electronic leak detector
to check all flanges and solder joints after the chiller is
pressurized. If any leaks are detected, follow the leak test
procedure.
If the chiller is spring isolated, keep all springs blocked in
both directions to prevent possible piping stress and dam-
age during the transfer of refrigerant from vessel to vessel
during the leak test process, or any time refrigerant is being
transferred. Adjust the springs when the refrigerant is in
operating condition and the water circuits are full.
Refrigerant Tracer — Carrier recommends the use of
an environmentally acceptable refrigerant tracer for leak test-
ing with an electronic detector or halide torch.
Ultrasonic leak detectors can also be used if the chiller is
under pressure.
Do not use air or oxygen as a means of pressurizing
the chiller. Mixtures of HFC-134a and air can undergo
combustion.
Fig. 24 — Typical Wet-Bulb Type
Vacuum Indicator
46
To Next Page
Loading...
