Leak Test and Dehydration
All 30GT units are
shipped with complete operating charge of Refrigerant 22
(Table 1) and should be under sufficient pressure to
conduct leak test after installation. If there is no system
pressure, admit refrigerant until a pressure is observed
and then proceed to test for leaks. After leaks are re-
paired, the system must be dehydrated. For leak testing
and dehydration procedures, refer to Carrier Standard
Service Techniques Manual, Chapter I, Refrigerants,
Sections 6 and 7.
Refrigerant Charge
When additional or complete
field charging is required, refer to Table I and use the
Liquid Charging Method. Refer to
Standard
Service Techniques Manual, Chapter 1, Refrigerants,
Section 8, for charging procedures.
Immediately ahead of the filter drier is a
installed liquid shutoff charging valve, A
flare
connection is provided for
charging.
Never charge liquid into low-pressure side of system.
Do not overcharge. During charging or removal of
refrigerant, be sure water is continuously circulating
through the cooler to prevent freezing.
Control Power Circuit
Switch 115-l-60 or
230-I-50 field disconnect to ON. The cooler heater is
factory wired into the control circuit.
IMPORTANT: The compressor crankcase heater
should be on as soon as auxiliary circuit is energized.
Allow crankcase heater to operate at least 24 hours
before starting unit, then close main power circuit
Actual Start-Up
should be done only under super-
vision of a qualified refrigeration mechanic:
Open any compressor and system valves that were
closed during charging.
Turn control circuit toggle switch to START.
Be sure all safety devices are satisfied.
Check to see that the leaving chilled water tempera-
ture agrees with the dial setting on the temperature
controller. If it is not the same as the dial setting,
the variation can be compensated by shifting the
control point slightly to obtain the proper leaving
chilled water temperature.
SERVICE
Turn off all power to unit before proceeding,
I
Access for Servicing (See Fig. 9)
COMPRESSOR SECTION
The compressor com-
partment has 2 side doors and one front door for servic-
ing, providing access to compressor, all components of
the refrigeration system, electrical controls and control
box. After opening front door an inner cover must be
removed for access to control box.
The low water temperature cutout and water tempera-
ture control are located in the auxiliary control box
behind the side access door on the cooler side. Both can
be adjusted without removing auxiliary box cover.
CONDENSER SECTION
Condenser fan motors and
fans can be serviced by removal of outlet grilles or side
panels. If a fan motor is serviced, be sure the wire fan
guard is in place over each fan before starting unit.
See Fig, IO for proper fan adjustment. Tighten fan hub
securely on motor shaft with setscrew which bears against
the key. Be sure to replace Permagum and rubber cap
over end of motor shaft to protect against moisture
causing fan to rust on shaft.
COOLER SECTION
The cooler can be serviced
from the side or the end opposite the compressor com-
partment. To remove cooler tubes or entire cooler, see
Fig. 5, 6, 7 for minimum clearance required. Cooler
should be removed from end of unit.
LEFT FRONT VIEW, COMPRESSOR END
END, LEFT FRONT ACCESS D O O R
COMPRESSOR END, CONTROLS PANEL REMOVED
Fig. 9
Unit with Access Panels Removed
5,020
Shown)
10
