Carrier 26H - Manual (Page 27)

Carrier S E R V I C E 26H
W
FROST LINE METHOD OF CHARGING
By establishing a frost point on the suction line,
it is possible to charge these units to within one
ounce of their specified charge. By this, frost point,
it is also possible to determine whether or not a
machine is only partially charged. Below are listed
the recommended methods for charging the H3 and
H5 ice makers, which require a partial or a full
charge. Frostline should be at the point indicated
when the machine has operated on the freezing
cycle for 20 minutes.
2. Charge slowly until the suction shutoff valve
and flare nut frost
3. Bleed off gas until frost just recedes from valve.
Method 2A - 26H5 Ice Maker No Charge in Unit
1. Remove first clip immediately above small ac­
cumulator, and pull back two or three inches of
the suction line insulation.
2. Start machine with pump on. Charge until suc­
tion pressure is 15 PSIG.
i
CAUTION: If Freon is added in small amounts, the
frost line will continue to move towards the small
accumulator. If Freon is added too rapidly, the
frost line will disappear. It is then necessary to
wait until the frost reappears before adding or
bleeding off refrigerant.
After making sure that the machine is leak free
and in good running condition, proceed as follows
with the pump runnfng during the entire freezing
cycle.
Method lA - 26H3 Ice Maker No Charge in Unit
1. Start the unit with the pump running. Charge
until the suction pressure is 15 PSIG.
2. Continue running the machine for 10 minutes
without adding to the charge.
3. Add gas slowly until frost forms on the suction
shutoff valve and the flare nut.
4. Bleed off slowly until frost just recedes from
valve.
Method IB - 26H3 Ice Maker Partial Charge in Unit
1. Start unit and let it run undisturbed for 20 min­
utes.
3. Discontinue charging and allow machine to run
for 10 minutes. During this period, check to
see if the suction pressure is holding at ap­
proximately 15 pounds.
4. Charge slowly until ffost forms on the suction
line between the small accumulator and the
suction shutoff valve on the compressor.
5. Bleed off gas until frost line recedes back to
the joint on the top of the second accumulator.
6. Allow machine to run through two complete cy­
cles to check operating pressures.
Method 2B • 26H5 Ice Maker Partial Charge In Unit
1. Remove insulation from suction line 2 or 3"
above second accumulator.
2. Start machine and allow it to run for 20 min­
utes undisturbed.
3. Charge slowly until frost forms on fhe suction
line between the small accumulator and the
suction shutoff valve.
4. Bleed off gas unfil frost line recedes back to
the top of the second accumulator.
5. Allow machine to make two complete cycles to
check its operating pressures.
27 26H-57PD