Carrier 16JA - Manual (Page 3)

STORAGE CHAMBER
SUPPLY LINE
CONDENSER PURGE
SUCTION LINE
PURGE EXHAUST
VALVE
INSTRUCTION
STICKER
PURGE
SEPARATION
CHAMBER
PURGE RETURN VALVE
TO GENERATOR OVERFLOW TUBE
SOLUTION PUMP-
Fig. 1 - Purge Exhaust System
Manual Exhaust Procedures
1. Close purge return valve.
2. Wait 10 minutes for storage chamber to
pressurize.
3. Slowly open purge exhaust valve. If level in
container drops, shut valve and wait 2 minutes.
Reopen valve. If bubbles appear, keep valve
open until bubbles stop and level in container
rises, then close valve.
4. Collect lithium bromide solution to recharge
into machine. Recharging procedures are given
in Carrier Standard Service Techniques, pub­
lication SM-16.
SOLUTION DESOLIDIFICATION
General - Should solidification occur, it will occur
usually in the shell side ofthe heat exchanger, pre­
venting the strong solution in the generator from
returning to the absorber thru the strong solution
line. However, the strong solution will be returned
to the absorber thru the generator overflow tube
(Fig. 6) thereby desolidifying automatically.
If during a shutdown period solidification has
occurred to the extent that the solution pump will
not rotate and the motor overloads trip put, de-
solidify by using the following procedure.
PROCEDURE
1. Heat the pump casing and adjacent lines with
steam until the pump will rotate. Be careful
not to allow steam and condensate to enter the
pump motor and controls.
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2. Confirm pump rotation. Rotation of the her­
metic pump cannot be viewed directly. Install
a compound pressure gage on the solution pump
service valve. With correct pump rotation, the
gage will indicate a positive reading above at­
mospheric pressure. If the pump is solidified,
the gage will indicate atmospheric pressure.
If the casing is partially desolidified and the
pump will not turn, the pressure gage will in­
dicate a deep vacuum. Continue to heat the
casing until the pump is desolidified. Desolid­
ification of the heat exchanger will take place
automatically once the pump starts functioning.
3. Refer to Troubleshooting Guide for possible
causes of solidification and their correction.
M A I N T E N A N C E
INTRODUCTION
General - The following are routine steps nec­
essary for normal preventive maintenance on
16JA Hermetic Absorption Liquid Chillers.
To ensure the continued satisfactory perform­
ance of the machine, these schedules must be
closely adhered to.
We recommend the suggested steps be per­
formed as often as indicated, and that an accurate
log be kept to aid in diagnosing any troubles.
Certain components and operations should be
checked on an individual basis as needed.
EACH MONTH
Reclaim Solution - During normal operation it is
possible that some lithium bromide might carry
over into the refrigerant circuit.
To determine if contamination exists, remove
a refrigerant sample from the machine using
refrigerant and solution sampling procedures out­
lined in Carrier Standard Service Techniques,
publication SM-16. Measure the specific gravity
of the sample. If the value exceeds 1,02, the solu­
tion must be reclaimed.
RECLAIM PROCEDURE FOR CONTINUOUS OP­
ERATION
1. Place reclaim valve switch in MANUAL posi­
tion. Wait for approximately 15 minutes. This
causes refrigerant to flow into the solution
circuit where the lithium bromide solution
is reclaimed.
2, Place reclaim switch in AUTO position, de­
energizing the refrigerant solenoid valve,
thus stopping refrigerant flow.
RECLAIM PROCEDURE FOR FREQUENT SHUT­
DOWN - When the machine is shut down, the re­
claim valve will automatically reclaim the lithium
bromide salt solution.
NOTE: If the reclaim solenoid valve does not
energize during the reclaim procedure (aud­
ible click, and typical rattling noise of refrig­
erant passing thru the valve) contact your
nearest Carrier representative for assistance.