Carrier 26H - Manual (Page 48)

26H S E R V I C E
Carrier
■^1—
This thermal overload element will open the cir­
cuit when overheated and cut off power to the com­
pressor. When the compressor cools off, the thermal
element cools slowly and starts the compressor
again. Thus, an overloaded compressor will stop
for an interval, then restart and, after running a-
while, will stop again. If a unit is starting and
stopping due to the motor overload, immediate steps
should be taken to locate and remedy the cause,
since continued cycling may damage the compressor.
Overloading may be due to low voltage, loose termi­
nals, faulty relay, or causes connected with the re­
frigerant circuit.
It is possible to determine if current is flowing
through the motor overload by testing at the com­
pressor terminals. Turn the selector switch to
"on", and place the prongs of a current tester on
terminals "R"and "C"of the compressor. A light
will indicate the current is flowing through the
overload and that it is functioning properly. No
light when the compressor is cool (approximate
room temperature) will indicate that the overload is
stuck open and should be replaced. No light when
the compressor is hot will indicate that the over­
load may be functioning properly, but has cut out
due to overloading the compressor.
27. CRUSHER ELECTRIC CIRCUIT
Figs. 24 and 26 are schematic wiring diagrams of
the 26H3 and 26H5 crsuher-equipped Ice Makers
respectively.
CRUSHER MOTOR
This is a 1/6 horsepower 115/230 volt motor.
Oil twice a year with standard SAE 20 motor oil.
To replace the motor, remove the crusher assembly
as explained in Section 19. The motor is held in
place with two bolts and a retainer plate. When
mounting the replacement motor, carefully line up
the two pulleys and tighten the belt so that it can
be depressed 1/4" with the pressure of one finger.
C A U T I O N : Excessive belt tightness will cause
the rear crusher bearing to overheat, lose its'oil
and become scored.
SAFETY SWITCH
A normally-open safety switch is in the crusher
wiring circuit. When the front panel is removed, this
switch breaks the circuit to keep the crusher from
operating and possibly causing injury.
The access door has a printed warning to open the
main disconnect switch v/henever servicing this
unit. Do not ignore this warning! The safety switch
is provided for added protection.
This switch can be removed by removing two of the
machine screws which hold it in place and dis­
connecting the wiring. When replacing this switch,
be sure that the front panel depresses the safety
switch arm to close the switch contacts.
DAMPER SWITCH
The damper switch opens the circuit to the crusher
motor when engaged by an arm of the damper link­
age. When the damper is moved to the "crushed"
position,the damper switch completes the crusher
wiring circuit.
28. CONTROLS
MAIN CONTROL THERMOSTAT
A Ranco two-bulb, single-pole double-throw switch
is used on the 26H series Icemakers. This is an
interlocking type of control; that is, when it cuts
out on the bulb in the overflow well, it can cut
in only from the bulb on the suction line and vice
versa. The cut out side of this control is set at
38°, and the adjustment is locked. The cut in side
of this control is adjustable, and the setting should
be raised if the time between the dropping of the
last ice cube and the start of the freeze cycle is
less than 30 seconds. The setting may be lowered
if the time between the dropping of the last cube
and the start of the freezing cycle is mo;e than
1-1/2 minutes. Unless maximum capacity is re­
quired, an overrun time of 1-1/2 minutes to 3
minutes is not serious enough to warrant adjusting
the control. The cross ambient bulb on the cut in
side provides control by bulb only, thus the capil­
lary and bellows are not affected by ambient temper­
ature and this control will operate properly at am­
bient air temperatures of between 50° and 100 °F.
This thermostat cycles the unit from freezing to
defrost. At the end of the freezing cycle,water
from the freezing columns overflows into the con­
trol bulb well. When this happens, the cold water
actuates the thermostat, which stops the water
pump and energizes the hot gas solenoid valve,
thus starting the defrost cycle. The capillary
leading from the overflow well to the Ranco control
actuates only the cutout side of this control. As
t
26H-57PD 48