Carrier 26H - Manual (Page 49)

Carrier
S E R V I C E 26H
the hot gas passes through the hot gas solenoid
into the evaporator and then to the accumulator, it
warms the cut out capillary which closes the cut
out side of the control. The hot gas also warms
the suction line. When the vertical portion of the
suction line leading from the accumulator, to which
the cut-in bulb is attached, becomes warm, it actu­
ates the cut-in side of the control which closes the
hot gas solenoid valve and starts the pump.
PROCEDURE TO CHECK OUT MAIN CONTROL
THERMOSTAT
1. Shut off machine and allow bulbs to warm up
(about 5 minutes). Platens* should rise to
top position. If they do not, a bulb has lost
its charge.
2. Turn on machine. Right platen should drop
in a few minutes. If it does not, check for
low refrigerant charge.
3. Thirty to forty minutes after start of freezing
cycle, water should back up into the overflow
trough and drop into the overflow well. Left
platen should drop, pump stop, and solenoid
open. If not, check for restricted water path to
control bulb well, algae or dirt in well, and
proper placement of left control bulb element
in well.
4. The left platen should rise soon after the
start of the defrost cycle. Right platen should
rise a few minutes later and switch machine
to next freezing cycle. Condenser water
should not flow during defrost cycle. Check
the overrun time.**
* Platens - Hinged plates (inside control) actu­
ated by control bellows.
** Overrun time - period between falling of last
ice cube and start of next freezing cycle. Should
average 1/2 to 1-1/2 minutes. To increase this
time, raise the setting of the right hand (cut-in)
element.
W A R N I N G :
High ambient temperature, high water temperature
and/or high head pressure will result in a reduction
in over run time. If the main control is set at low
or normal temperatures and pressures, allow suf­
ficient over run time to avoid trouble in case of an
increase in any of the conditions mentioned above.
If the controls ore set for an over run time of 90-
150 seconds at a temperature of 50° Air and 45°
Water, an increase in Air temperature to 80° and
an increase in Water temperature to 80° will result
in an over run time of 30 - 45 seconds.
29. SAFETY OVERFLOW
The safety overflow is installed on a 26H Icemaker
to protect the machine against bulged columns.
If the machine fails to go into the defrost cycle,
more tubes in the evaporator will overflow, causing
the water level in the overflow trough to rise and
run out the upper overflow connection into the float
chamber, thus causing the float to trip the machine
off.
FIG. 29 - FRONT OF 26H5 MACHINE SECTION
30. BIN THERMOSTAT
The bin thermostat shuts off the unit when the
storage compartment is full of ice. See Fig. 30.
It is a single-pole single-throw switch in series
with one lead from the selector switch. The thermo­
stat is accessible after removing the front panel and
is in the same casing as the high pressure switch.
When servicing the control, remove the control with
the holding bracket. It is possible to disconnect
49 26H-57PU