Compressor Assembly - Carrier AQUAFORCE 30XA080-500 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

EXV TYPE AND CIRCUIT
EXV, Circuit A
EXV, Circuit B
EXV, Circuit C
Economizer EXV, Circuit A
Economizer EXV, Circuit B
Economizer EXV, Circuit C
Inspecting/Opening Electronic Expansion Valves
IMPORTANT: Obtain replacement gaskets before
opening EXV. Do not re-use gaskets.
To check the physical operation of an EXV, the following
steps must be performed if the unit does not have service valve
option or activated ball valves (ABV) (flooded coolers only)
the complete charge needs to be recovered using proper recov-
ery techniques Steps 1-3 shown below. If the unit has ABV or
discharge service valves, only perform Steps 1 and 2.
1. Close the liquid line service valve of the circuit to be
checked. Put the Enable/Off/Remote Contact switch in
the Off position. Enter the Service Test mode and change
Service Test Enable, T.REQ from OFF to ON. A pass-
word may be required. Switch the EOR switch to the
Enable position. Under the COMP sub-mode, enable one
of the compressors (CP.xn) for the circuit. Let compres-
sor run until gage on suction pressure port reads 10 psig
(68.9 kPa). Turn the compressor off. The compressor will
turn off. Immediately after the compressor shuts off,
manually close the actuated ball valve (ABV) (see the
Actuated Ball Valve section for instructions). If the unit is
equipped with suction service valves, discharge service
valve, and economizer service valves, close all valves.
Closing the valves will minimize the amount of charge
that will have to be removed from the system after pump
down.
2. Remove any remaining refrigerant from the system low
side using proper recovering techniques. The economizer
assembly has a / -in. access connection which can be
1
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used to remove charge from the inlet of the EXVs. Turn
off the line voltage power supply to the compressors.
CAUTION
Ensure refrigerant is removed from both the inlet and outlet
of EXV assemblies. Equipment damage could result.
3. The expansion valve motor is hermetically sealed inside
the top portion of the valve. See Fig. 47. Disconnect the
EXV plug. Carefully unscrew the motor portion from the
body of the valve. The EXV operator will come out with
the motor portion of the device. Reconnect the EXV plug.
4. Enter the appropriate EXV test step under the (QUIC)
Service Test mode Locate the desired item Circuit A
EXV Position, EXV.A, Circuit B EXV Position,
EXV.B, or Circuit C EXV Position, EXV.C. Change the
position to 100%. Observe the operation of the lead
screw. See Fig. 47. The motor should be turning, raising
the operator closer to the motor. Motor actuator move-
ment should be smooth and uniform from fully closed to
fully open position. Select 0% and check open to closed
operation. If the valve is properly connected to the pro-
cessor and receiving correct signals, yet does not operate
as described above, the sealed motor portion of the valve
should be replaced.
Table 48 — EXV Modes and Submodes
TOUCH PILOT™ PATH
 
Main Menu Status CIRCA_AN
 
Main Menu Status CIRCB_AN
 
Main Menu Status CIRCC_AN
 
Main Menu Status QCK_TST1
 
Main Menu Status QCK_TST1
 
Main Menu Status QCK_TST1
Service Test Mode
Service Test Mode
Service Test Mode
Service Test Mode
Service Test Mode
Service Test Mode
Installing EXV Motor
IMPORTANT: Obtain replacement gasket before
opening EXV. Do not re-use gaskets.
If re-installing the motor, be sure to use a new gasket in the
assembly. See Fig. 48. It is easier to install the motor assembly
with the piston in the fully closed position. Insert the motor into
the body of the EXV. Tighten the motor to the body to 36 ft-lb
(50 N-m) and then tighten the valve another 30 degrees.
Moisture Liquid Indicator — Clear flow of liquid refrigerant
indicates sufficient charge in system. Bubbles in the sight glass
indicate undercharged system or presence of noncondensables.
Moisture in system, measured in parts per million (ppm),
changes color of indicator. See Table 49. Change filter drier at
first sign of moisture in system.
Table 49 — Color Indicators when
Moisture is Present in Refrigerant
COLOR
INDICATOR
Green — Dry
Yellow-green — Caution
Yellow — Wet
IMPORTANT: Unit must be in operation at least
12 hours before moisture indicator can give an accu-
rate reading.
With unit running, indicating element must be in con-
tact with liquid refrigerant to give true reading.
Filter Drier — Whenever moisture-liquid indicator shows
presence of moisture, replace filter drier(s). There is one filter
drier assembly on each circuit with either one or two cores.
The 30XA080-122 units have one core per circuit. The
30XA140-162 units have two cores, in circuit A and one for
circuit B. The 30XA180-500 units have two cores per circuit.
Refer to the Carrier Standard Service Techniques Manual,
Chapter 1, Refrigerants, for details on servicing filter driers.
Liquid Line Service Valve — This valve is located immediately
ahead of filter drier, and has a
charging. In combination with compressor discharge service
valve, each circuit can be pumped down into the high side for
servicing.
Compressor Assembly —
screw compressors with a modulating slide valve which varies
capacity from 30% to 100% of compressor capacity for each
circuit. See Fig. 49 for a view of a typical 06T compressor.
The slide valve position is varied by opening and closing the
2 solenoid valves located on the compressor. To unload the
compressor, both solenoids are deenergized. To increase in
capacity both solenoid valves are energized together which
will cause the slide valve to slide towards the fully loaded
position. To stop the loading process solenoid 2 is energized
and solenoid 1 is deenergized. This will cause the slide valve to
maintain its current position. There is no feedback for the posi-
tion of the slide valve. The control utilizes compressor current
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NAVIGATOR™ PATH
 
QUIC EXV.A
 
QUIC EXV.B
 
QUIC EXV.C
 
QUIC ECO.A
 
QUIC ECO.B
 
QUIC ECO.C
R-134A, R-134A,
75 F (24 C) 125 F (52 C)
(ppm) (ppm)
<30 <45
30-100 45-170
>100 >170
1 / -in. access connection for field
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The 30XA units utilize