5. Reinst_dlburnersonrack.
6. Reinst_dlburnerrockasdescribedabove.
Filter Drier -- Replace whenever refiigerant system is ex-
posed to atmosphere. Only use factory specified liquid-line
filter &iers with working pressures no less than 650 psig. Do
not install a suction-line filter drier in liquid line. A liquid-line
filter &'ier designed for use with Puron® refrigerant is required
on every unit.
Protective Devices
COMPRESSOR PROTECTION
High-Pressure Switch -- If the high-pressure switch opens,
the compressor will shut down. On 3-phase units, the compres-
sor lockout (CLO) device will energize to block further
compressor operation. Tile high-pressure switch will reset auto-
matic_dly as the refrigerant pressure &ops below its reset level.
On 3-phase units the CLO will remain energized until manu:dly
reset.
Low-Pressure Switch -- ff the low-pressure switch opens, the
compressor will shut down. On 3-phase units, the compressor
lockout (CLO) device will energize to block further complessor
operation. The low-pressure switch will reset automatically as
the mfiigerant pressure rises above its reset level. On 3-phase
units, the CLO will remain energized until manu_dly reset.
Freeze Protection Switch -- This switch is installed on each
evaporator coil section to provide protection against continued
unit operation with a frosted evaporator surface. If the freeze
protection switch opens, the compressor on this circuit will
shut down. On 3-phase units, the compressor lockout (CLO)
device will energize to block further compressor operation. The
freeze protection switch will reset as the evaporator tube tem-
perature rises above its reset level. On 3-phase units, the CLO
will remain energized until manually reset.
Complessor Lockout (CLO) Device (3-Phase Units Only) --
The CLO prevents automatic recycling of the compressor as
safety controls reset. If the high-pressure switch, low-pressure
switch or freeze protection switch opens, the CLO device will
energize to block further compressor operation. To reset the
CLO (after all safety switches have reset), either open file ther-
mostat to remove tile cooling demand signal (and then re-close)
or cycle the control power in the unit.
Overcurrent -- Each compressor has internal line break motor
protection.
Overtemperature -- Each compressor has an internal protector
to protect it against excessively high discharge gas temperatures.
EVAPORATOR FAN MOTOR PROTECTION -- Indoor fan
motors are equipped with internal overcurrent and overtemper-
ature protection. Protection devices reset automatically. Dis-
connect and lock out power when servicing motol: Do not by-
pass protective devices. Determine the cause and fix problem.
CONDENSER-FAN MOTOR PROTECTION -- Each
condenser-fan motor is internally protected against
overtemperature.
Relief Devices -- All units have relief devices to protect
against damage fiom excessive pressures (i.e., fire). These
devices protect the high and low side and _u'elocated at the suc-
tion line service port. Protect joint during brazing operations
ne;u"joint.
Control Circuit, 24-V--Each control circuit is pro-
tected against overcurrent by a 3.2 amp circuit breakel:
Breaker can be reset. If it trips, determine cause of trouble
before resetting. See Fig. 38 and 39.
Replacement Parts -- A complete list of replacement
parts may be obtained from any Carrier distributor upon
request.
Diagnostic LEDs -- The IGC control board has a LED
for diagnostic purposes.
A
....
SECTIONE-E
SCALE 2:1
SPARK GAP
SECTION C-C
_C
D .........
SECTIONA-A
SCALE 1:1
SECTIONB-B
SCALE 1:1
Fig. 41 -- Spark Gap Adjustment
43
SECTIOND-D
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