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TTW1 Universal Service
Replacement Blower
M1TW Series
Page 23
Step 7.
b.) Replace the current pressure switch
ONLY IF the model is for high altitude
(2001 ft. & above).
i. For high altitude applications, the
factory installed pressure switch
must be replaced. The correct
pressure switch is P/N
239-47192-01 with a setting of
-0.70" wc.
c.) When installing the high altitude
pressure switch, be sure to reconnect
the pressure switch tubing to both the
pressure tap and the switch itself.
Also, reconnect the wires for the
pressure switch circuit to the new
pressure switch. Ensure that
the tubing is not kinked.
Step 8. a.) Ensure that once in place, the pressure
switch should be mounted such that its
diaphragm is in the vertical position.
Warning: Failure to replace universal blower pressure
switch for high altitude will result in improper
water heater operation.
Disconnect (2) flag
terminals and tubing
from pressure switch
to remove.
Choose corresponding pressure switch
from kit. Verify correct P/N and setting
on label to match this model’s
requirements, as shown in Step 7b.
Be sure to reconnect
tubing and (2) flag
terminals.
Verify electrical
and tubing
connections.
Mount in vertical
position using
bracket.