Service Manual

Pressure Switch Replacement
WARNING
115 volt potential exposure. Use caution
to avoid personal injury.
Step6. Reconnect wires from step5tonewpressure switch.
Step7. Reconnecttubing tonewpressure switch.
Step8. Carefully position pressure switch into blower housing.
Step9. Position gas control power switch to “ON” position and verify proper heater operation.
Step 10. Replace
control access cover from step 2.
Step1. Position gas control powerswitch to
the “OFF” position.
Step 2.Remove the three screws (Phillipsscrewdriver)from control access cover on blower assembly and
remove cover (
see photos 4 and 5).
Pressure Switch
Slide pressure switch in direction of
arrow while tilting slightly away
from blower housing.
Step3. Carefully remove pressure
switch from blower
housing (see photo 6).
Step4. Disconnecttubing from
pressure switch
(see photo 7).
Step5. Disconnect yellow wires
from pressure switch
(see photo 8).
UTTW SERVICE PROCEDURE IV
Pressure Switch Testing and
Replacement
Page 21
5
6
7
8
Control Access
Cover Screws
4
R
21