Carrier 19XL - Manual (Page 41)

Safety Shutdown — A safety shutdown is identical to
a manual shutdown with the exception that the LID will dis-
play the reason for the shutdown, the alarm light will blink
continuously, and the spare alarm contacts will be ener-
gized. A safety shutdown requires that the RESET softkey
be pressed in order to clear the alarm. If the alarm is still
present, the alarm light will continue to blink. Once the alarm
is cleared, the operator must press the
CCN or
LOCAL softkeys to restart the chiller.
Do not reset starter loads or any other starter safety for
30 seconds after the compressor has stopped. Voltage
output to the compressor start signal is maintained for
10 seconds to determine starter fault.
BEFORE INITIAL START-UP
Job Data Required
• list of applicable design temperatures and pressures (pro-
duct data submittal)
• chiller certified prints
• starting equipment details and wiring diagrams
• diagrams and instructions for special controls or options
• 19XL 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. 25)
• 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 Pumpout and Refrigerant Transfer
Procedures section, page 59 for: pumpout system prepara-
tion, refrigerant transfer, and chiller evacuation.
Remove Shipping Packaging — Remove any
packaging 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 that 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
gasketed joints and guide vane shaft packing to ensure a leak-
tight chiller.
Check Chiller Tightness — Figure 26 outlines the
proper sequence and procedures for leak testing.
19XL chillers are shipped with the refrigerant contained
in the condenser shell and the oil charge shipped in the
compressor. The cooler will have 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, fol-
low the leak test procedure.
If the chiller is spring isolated, keep all springs blocked in
both directions in order to prevent possible piping stress and
damage during the transfer of refrigerant from vessel to
vessel during the leak test process, or any time refrigerant is
transferred. Adjust the springs when the refrigerant is in
operating condition, and when 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 also can be used if the chiller is
under pressure.
Do not use air or oxygen as a means of pressurizing the
chiller. Some mixtures of HCFC-22 or HFC-134a and
air can undergo combustion.
Leak Test Chiller — Due to regulations regarding
refrigerant emissions and the difficulties associated with sepa-
rating contaminants from refrigerant, Carrier recommends
the following leak test procedures. See Fig. 26 for an outline
of the leak test procedures. Refer to Fig. 27 and 28 during
pumpout procedures and Tables 5A, B, C, and D for refrig-
erant pressure/temperature values.
1. If
the pressure readings are normal for chiller
condition:
a. Evacuate the holding charge from the vessels, if present.
b. Raise the chiller pressure, if necessary, by adding re-
frigerant until pressure is at equivalent saturated pres-
sure for the surrounding temperature. Follow the pumpout
Fig. 25 — Typical Wet-Bulb Type
Vacuum Indicator
41