IBM Rear Door Heat eXchanger V2 Installation And Maintenance Manual page 76

Figure 53. Air-purging tool
66
Rear Door Heat eXchanger V2: Installation and Maintenance Guide
6. If the air-purging tool is available (see the illustration), complete the following
steps. Otherwise, go to step 7.
Hose Hose
Extension hose Extension hose
a. Remove the extension hose from the air-purging tool, if it is connected.
b. Place the drain end of the air-purging tool hose into a 0.47 L (16 oz) or
larger container to collect water if any remains within the heat exchanger.
c. Attach the air-purging tool to the drain valve at the bottom of the heat
exchanger. Make sure that you attach the end of the hose with a valve
stem in the center of the connector to the heat exchanger drain valve. If
you connect the wrong end of the hose, no water will flow.
d. Attach the extension hose to the air-purging valve at the top of the heat
exchanger to allow air to enter the manifolds. Make sure that you attach
the end of the extension hose with a valve stem in the center of the
connector to the heat exchanger purge valve. If you connect the wrong end
of the hose, no water will flow.
e. Take one of the following actions, depending on the amount of water that
comes out of the hose:
v If only a little or no water comes out of the air-purging tool, the heat
exchanger is sufficiently drained. Go to step 8 on page 67.
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.
7. If the air-purging tool is not available, complete the following steps:
a. Place a 0.47 l (16 oz) or larger container under the drain valve at the
bottom of the heat exchanger to collect water if any remains within the heat
exchanger.
b. Use a small object such as a screwdriver tip to press in on the valve stem
of the drain valve at the bottom of the heat exchanger.