4 UHM-DHM-SF-1H
Service Facts
Heat Exchanger (Cold Header)
Burner Box
H-Fitting
Pressure
Switch
PS-1
Tee
Tee
Tee
Pressure Switch
PS-3
Pressure
Switch
PS-2
Negative
Control
Pressure
Post
Positive Control
Pressure Post
Modulating
Gas Valve
Orifice in H fitting must
be pointing away from PS1
FURNACE COMPONENTS
To Pressure
Switch PS-1
! Important !
Brass orifices located in these two legs.
H-Fitting must be installed in this orientation.
VACUUM HOSE ROUTING
WARNING
!
FIRE - EXPLOSION HAZARD
DO NOT RUN FLEXIBLE GAS LINE THROUGH THE
FURNACE CABINET WALL OR WITHIN THE FURNACE
CABINET. FAILURE TO FOLLOW THIS WARNING
COULD RESULT IN PROPERTY DAMAGE, SERIOUS
PERSONAL INJURY, OR DEATH.
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