Carrier 26H - Manual (Page 37)

S E R V I C E 26H
i
13. WATER REGULATING VALVE ADJUSTMENT
A 3/8" water regulating valve is used to control
the water flow through the condenser. This valve
is located in the inlet side of the condenser water
system. For best operation and maximum ice pro­
duction the head pressure should be maintained at
approximately 125 PSIG for 26H5 and 130 PSIG for
the 26H3. This is equivalent to approximately a
20° rise in condenser water temperature. Head
pressures below 125# and 130# respectively will
increase the harvesting cycle due to insufficient
hot gas for defrost. Head pressures above those
recommended will increase the freezing time and
may overload the compressor. Adjust the water re­
gulating valve by turning the notched ring. See
Fig. 20. A quarter turn will change the head pres­
sure approximately 5 PSIG.
A defective water regulating valve can be removed
without breaking the high pressure connection by
removing the screws which hold the bellows bonnet
in place. If it is necessary to replace the bellows,
pump down the compressor as explained in Section 4.
14. WATER TREATMENT
During the freezing cycle, only pure water is frozen
into cubes and removed from the water circuit.
Accumulated impurities remain in the system and
may eventually cause scaling. Various water
softeners are on the market but none of these, ex­
cept a costly total demineralizing process, are suf­
ficiently effective.
The concentration of minerals is decreased by the
siphon heat interchanger. The sump is flushed
out at the end of each freezing cycle and filled
with fresh water. This flushing process does not
eliminate the necessity of cleaning the unit, but
it does decrease the number of times per year this
cleaning is necessary.
In some localities the amount of suspended matter
in the supply water may cause trouble. To cut down
the amount of impurities entering the system, in­
stall a water filter in the water supply line before
the interchanger. The filter should be checked at
each inspection call and the filtering cartridge re­
placed if it obstructs the flow of water.
15. WATER SYSTEM CLEANING
The frequency and the amount of cleaning will vary
depending on the mineral content of the water
supplied.
At least once a month the water compartment should
be flushed by removing the siphon standpipe. When
extensive cleaning is required, proceed as follows:
1. Turn off the ice maker; close off the water
supply line.
2. Remove the access panel and the inner access
door.
3. Remove the ice deflector.
4. Drain the water pan.
5. Inspect the parts removed and the water pan
for signs of scaling. The amount of scaling
can be decreased by more frequent flushing.
6. Remove the top panel and water header to
check for deposits on the spreader plates.
7. If a water filter is used, check the filter ele­
ment for dirt or other foreign deposits. Re­
place the element if necessary.
8. Clean the water pan panels and deflectors by
using a wire brush, soap and hot water.
9. The spreader plates can usually be cleaned
by using a knife to dislodge the scale. If this
is not possible, then the spreader plates must
be removed for cleaning.
37 26H-57PD