Replacing A Valve Body - Carrier 42BJ ICM Installation Manual

8.4 - Replacing a valve body

a) Disconnect the power supply to the unit before carrying out
any work on a unit.
b) Close the isolating valves on the manifolds.
c) Uncouple the actuator from the valve body.
d) Disconnect the 1/2" gas connection nut on the flexible
water pipe from the valve to be replaced.
e) Unscrew and remove the valve body to be replaced (1/2"
gas connection).
f) Instal a new valve body on the coil (do not forget the joint).
g) Reconnect the flexible water pipe.
h) Reinstall the actuator ensuring that it is securely screwed to
the valve body.
i) Tighten all water pipes ensuring that all seals are correctly
installed (torque 15 N/m).
j) Open the isolating valves on the manifolds and bleed all air
from the system.
k) Check that there are no leaks and restart the ICM.
WARNING:
When replacing a valve always ensure that the direction of
flow through the valve is as shown by the arrow on the valve
body.
If the direction of flow is wrong, the valve will deteriorate
rapidly.
20
Two-way valve body
Three-way valve body
VALVE IN DETAIL
DIRECTION OF FLOW
VALVE IN DETAIL