Carrier 16JA - Manual (Page 2)

To prevent solidification while purging:
a. Place reclaim switch to MANUAL.
b. Throttle back steam control valve.
(1) Electronic Control - Turn the control
point adjustor up approximately ten
degrees (ten divisions).
(2) Pneumatic Control - Turn the chilled
water thermostat set point up ten
degrees.
4. Evaluate machine tightness with a noncon­
densable accumulation rate check. Refer to
Carrier Standard Service Techniques, publica­
tion SM-16.
Start-Up After Extended Shutdown - This pro­
cedure is critical since accumulated noncon­
densables may allow the machine solution to
solidify if the following precautions are not taken,
PROCEDURES
1. Start the machine as outlined for your system
under Machine Start-Up Procedures. Make
sure steam valve is closed. If absorber solu­
tion level is high (above 9 in.) and refrigerant
pump is noisy, open steam valve until absorber
level indicator shows approximately 9 in. of
solution, then close steam valve. Place refrig­
erant pump switch in ON position.
2. Determine absorber loss by following proce­
dures outlined in Carrier Standard Service
Techniques, publication SM-16.
a. If absorber loss is less than 6 F, open
steam valve and allow machine to go into
automatic operation.
b. If absorber loss is 6 F or greater, auxil­
iary evacuation is required. Use instruc­
tions for auxiliary evacuation provided in
Carrier Standard Service Techniques, pub­
lication SM-16.
3. Continue auxiliary evacuation until absorber
loss is less than 6 F. Place machine in auto­
matic operation.
4. After auxiliary evacuation, evaluate machine
tightness with a noncondensable accumulation
rate check.
WINTER CONDITIONS
General - At the end of each cooling season when
the machine is no longer required use one of the
following winter shutdown procedures. The choice
depends on whether the machine ambient tempera­
ture will be kept above or below freezing.
Shutdown Procedures
BELOW FREEZING
1. Stop machine and wait until automatic dilution
completes and machine pumps stop.
2. Set dilution thermostat to its lowest possible
setting.
3. Connect a hose between solution and refrig­
erant pump service valves. Open both valves.
4. Switch refrigerant pump ON-OFF switch to
OFF and solution pump switch to ON.
5. Press START button and allow solution pump
to run for approximately 5 minutes.
NOTE: This procedure contaminates the
refrigerant with lithium bromide solution
lowering the refrigerant freezing point.
6. Press STOP button and reset dilution thermo­
stat to 140 F (refer to Checking Dilution Ther­
mostat under Maintenance).
7. Drain water from all chilled water, condensing,
steam and condensate circuits. Flush all cir­
cuits with ethylene glycol.
ABOVE FREEZING
1. Press STOP button.
2. Allow machine to go thru automatic dilution.
When dilution has completed, machine may
be left in this condition until spring start-up.
Start-Up Procedures
BELOW FREEZING
1. Refill all water circuits that were drained at
shutdown.
2. Follow Start-Up After Extended Shutdown pro­
cedures.
3. Reclaim lithium bromide from refrigerant
circuit. Follow Reclaim Solution procedures
given under Maintenance.
4. Restart machine.
ABOVE FREEZING
1. If machine vacuum was broken for maintenance
work, etc., follow auxiliary evacuation pro­
cedures outlined in Carrier Standard Service
Techniques, publication SM-16. Then follow
Start-Up After Extended Shutdown procedures.
2. If machine vacuum was not broken, follow
Start-Up After Extended Shutdown procedures.
PURGE OPERATION
General - The 16JA purge unit automatically per­
forms the following functions:
1. Removes noncondensables from the machine.
2. Accumulates these noncondensables in the
purge storage chamber where they will not
affect the machine performance.
3. Provides an indication of the degree of air
leakage into the machine.
The 16JA purge unit cannot be used as an auxil­
iary evacuation device to evacuate the machine.
When the purge exhaust light (red) is energized
during machine operation, it indicates that the
purge must be manually exhausted. For instruc­
tions refer to the instruction sticker located on the
separation chamber (Fig. 1) or use the following
procedure.