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c. Have a second person use a small object such as a screwdriver tip to
press and hold the air-purging valve stem at the top of the heat exchanger.
d. Take one of the following actions, depending on the amount of water that
comes out of the drain valve:
v If only a little or no water comes out of the drain valve, the heat
exchanger is sufficiently drained. Go to step 8.
v If a significant amount of water comes out of the air-purging tool, the
heat exchanger is not drained. Close the valves immediately and do not
continue.
Note to service technician: The customer is responsible for draining
the heat exchanger. If the heat exchanger is not drained, have the
customer drain the heat exchanger by following the procedure in
"Draining the heat exchanger" on page 56. Disengage from the service
call until the customer informs you the door has been drained.
8. After making sure that the heat exchanger is drained, complete the following
steps:
a. Remove the air-purging tools, if used.
b. Screw the valve caps onto the air-purging valve and the drain valve and
hand-tighten them to provide a secondary seal.
c. Replace the inner and outer hose access panels.
CAUTION:
or
The weight of this part or unit is between 32 and 55 kg (70.5 and 121.2
lb). It takes three persons to safely lift this part or unit. (C010)
Attention:
a. Because of the size and weight of the heat exchanger, three trained
persons are required to install or remove the heat exchanger.
b. You must remove the power from the rack and all components before you
connect or disconnect the water supply lines and drain or fill the heat
exchanger.
9. Remove the heat exchanger from the rack:
a. Open the latch and let the heat exchanger door open slightly.
b. Position a platform ladder on the hinge side of the heat exchanger.
>32 kg (70.5 lb)
32-55 kg (70.5-121.2 lb)
or
Chapter 5. Maintaining the heat exchanger
67
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