Carrier 26H - Manual (Page 40)

26H S E R V I C E Carrier
TROUBLE ANALYSIS
To have the crusher operate, the following condi­
tions are necessary:
1. Three-position selector switch in "Pump" or
"On" position. Power supply to unit OK.
2. Safety switch in closed position. Panel must
depress switch arm to make contact.
3. Damper switch in "Crushed"position.
4. Main control in harvest cycle.
N O T E : Early models used a relay, and crusher ran
whenever unit was off on bin thermosiat. On later
units crusher runs when unit is off on bin fhermo-
stat only, unfil main control warms up and goes to
"F reeze " position.
If the above conditions are fulfilled and the crusher
still does not operate, the wiring and the various
controls should be checked with a test light.
4. ELECTRICAL CIRCUIT
20. CHECKING VOLTAGE
Check the outlet voltage. It should be within 10%
of the nameplate voltage. Try to make this test
when the voltage is likely to be the lowest; that
is, when the power line is carrying the heaviest
load.
Low voltage may prevent the unit from starting, or
if it is running, may cause the compressor to over­
heat and cutoff on the motor overload. Low voltage
can also result in bulged evaporator columns due
to failure of the hot gas solenoid to open.
Refer to Section 13 in the Installation Section con­
cerning a voltage transformer for increasing fhe
power supply to the unit.
21. LOOSE TERMINALS
Loose terminals will cause erratic operation. With
the disconnect switch opened, check the terminals
of the selector switch, relay, thermostats, solenoid
valve, water pump and compressor to make certain
they are tight.
22. SELECTOR SWITCH
A rotary type selector switch is located under the
the hinged nameplate. This switch is in series
with one lead from the power supply. C A U T I O N :
In the "Off" position the switch cuts power from
only one of the power supply leads. Therefore,
open fhe disconnecf switch when servicing the unit.
If fhe main confrol is in fhe "defrost" position the
water pump will not operate when the selector
switch is in the "pump"position.
To gain access to the switch terminals, first re­
move the indicating knob and hexagonal nut which
secures the switch to the bracket. Check the
operation of the switch with a test lamp.
23. CONTROL BOX
COMPRESSOR TERMINAL BOX 26H3
The compressor terminal box houses the starting
relay, the motor compressor terminal block, and
the motor overload. To gain access to the box
interior, remove the slotted screw in the front of
m
fhe box cover.
26H5
The confrol box houses fhe sfarting capacitor and
fhe sfarting relay. It Is located at the front of fhe
machine.
To gain access to the box interior, unscrew the wing
nut and slide the door to the left.
26H-57PD 40