Carrier 16JA - Manual (Page 5)

EVERY 2 YEARS
Replace Service Valve Diaphragms - Require­
ment to replace valve diaphragms is determined
by valve usage or number of machine operating
hours. Less frequent usage of valves and lower
number of machine operating hours results in
longer life span for valve diaphragms. With min­
imum usage the requirement to replace dia­
phragms might be 3 years. With maximum usage
they will need to be replaced in approximately
2 years.
PROCEDURES
1. Remove all solution and refrigerant from the
machine.
2. Break vacuum with nitrogen unless performed
previously. Refer to Carrier Standard Service
Techniques, publication SM-16,
3. Remove solution and refrigerant from machine
unless performed previously.
NOTE: Store solution in clean containers
for recharging.
4. Remove old valve diaphragms.
5. Install new valve diaphragms. Torque bolts
to 3 ft lb.
6. Leak test all affected joints to make sure
that all valves are leak tight.
7. Replace solution and refrigerant in machine.
NOTE: The same quantity of solution and
refrigerant removed from the machine must
be charged back into the machine.
8. Re-evacuate the machine after service work
is completed. See auxiliary evacuation pro­
cedures in Carrier Standard Service Tech­
niques, publication SM-16.
EVERY 5 YEARS
Inspect Hermetic Pumps - Pumps used on Carrier
Absorption Machines are hermetic and do not re­
quire seals. Pump motors are cooled by the fluid
being pumped and are thermally protected with
high-temperature cutouts (Klixons).
Inspect hermetic pumps and motors every
5 years or 20,000 hours, whichever comes first,
DISASSEMBLY PROCEDURES - Refer to Fig, 2
and Fig. 3.
1. Disconnect motor power leads at junction box
on stator. Mark leads for ease in reassembly.
2, Remove bolts (item 1) holding motor adapter
flange (item 2) to pump casing (item 3),
NOTE: Use blocking to support weight of
motor stator when removing bolts.
3, Pull stator and adapter flange straight back
from pump casing. If paint has frozen flange
to casing, gently pry between adapter flange
and pump discharge pipe (item 4) until paint
seal is broken.
4, Remove and discard gasket (item 5),
5. Remove impeller (item 6) by straightening
locking tabs on impeller lock washer (item 7).
Prevent impeller from rotating while removing
locking bolt (item 8). Remove impeller key in
the shaft.
6. Remove bearing and wearing ring housing:
a. F-8 Frame Pumps (Fig. 2) - Unbolt cap
screws (item 9). Remove bearing and wear­
ing ring housing (item 10).
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b. F-66 Frame Pumps (Fig. 3) - Remove stud
nuts (item 9). Use jacking screws to loosen
bearing and wearing ring housing (item 10),
Insert jacking screws in tapped holes pro­
vided in wearing ring housing.
7, Slide out rotor (item 11) carefully, so as not
to damage the stator can (item 12), rotor can
(item 13), or motor end bearing (item 14).
8. Remove motor end bearing, retaining clip (item
15) and spring (item 16). Remove spring bear­
ing plate (item 17) used on Frame F-8 only.
INSPECTION PROCEDURES
1. Check for bearing wear by measuring depth
from large end to start of cone (Fig. 4). If
wear exceeds 3/16 in,, replace the bearing.
Use standard parts lists for ordering new
bearing.
Instructions for bearing replacement are fur­
nished with new bearing.
2. Check recirculation passages (item 20). Clean
as required.
3. Check impeller stator can, rotor can and
wearing rings for wear. Clean or replace
if necessary.
NOTE: If wearing rings require replace­
ment, break the old ring with a chisel.
These rings were staked in place. Do not
restake new wearing ring.
4. Check spring loaded bearings for free move­
ment within the bearing housing.