12
UHM-DHM-SF-1H
Service Facts
CORRECT METHOD OF CHECKING DIRECT VENT MANIFOLD PRESSURE
WITH BURNER BOX REFERENCED
Manifold
Pressure
Measurement
Fitting
Field Supplied
Connects to
Burner Box
Pressure Hose
A Field Supplied barb fitting must be used
on the gas valve to attach the hose
Gas Valve
On/ Off
Toggle
Switch
High Heat
Manifold
Pressure
(Adjustment
under cover)
Inlet Pressure
Measurement Fitting
7
Negative Control
Pressure Post
Positive Control
Pressure Post
Low Heat Manifold
Pressure
(Adjustment under
cover)
Manifold
Pressure
Measurement
Fitting
Flow
TABLE 1
Furnace Input rate
(KBTU/hr)
FINAL LP MANIFOLD PRESSURE SETTINGS (inches w.c.)
40%
65%
100%
60
2.1 ± 0.5
Not Adjustable
10.0 ± 0.5
80
2.1 ± 0.5
Not Adjustable
10.0 ± 0.5
100
2.1 ± 0.5
Not Adjustable
10.0 ± 0.5
Downflow 120
2.1 ± 0.5
Not Adjustable
10.0 ± 0.5
Upflow 120
2.9 ± 0.5
Not Adjustable
10.0 ± 0.5
For upflow 120KBTU/hr model, 1st stage is 45%
Manifold pressures apply for Propane applications ONLY
Furnace Input rate
(KBTU/hr)
FINAL NG MANIFOLD PRESSURE SETTINGS (inches w.c.)
40%
65%
100%
60
0.7 + 0.2 / - 0.0
Not Adjustable
3.5 ± 0.2
80
0.7 + 0.2 / - 0.0
Not Adjustable
3.5 ± 0.2
100
0.7 + 0.2 / - 0.0
Not Adjustable
3.5 ± 0.2
Downflow 120
0.7 + 0.2 / - 0.0
Not Adjustable
3.5 ± 0.2
Upflow 120
0.9 + 0.2 / - 0.0
Not Adjustable
3.5 ± 0.2
For upflow 120KBTU/hr model, 1st stage is 45%
Manifold pressures apply for Natural Gas applications ONLY
▲
WARNING
!
EXPLOSION HAZARD
REPLACE AND/OR
TIGHTEN ALL PLUGS
REMOVED OR LOOS-
ENED WHEN ADJUST-
ING GAS PRESSURE.
LEAK CHECK THE FIT-
TINGS BEFORE PLAC-
ING INTO REGULAR
SERVICE. FAILURE TO
FOLLOW THIS WARNING
COULD RESULT IN SE-
RIOUS PERSONAL IN-
JURY, PROPERTY DAM-
AGE, OR DEATH
Slope
Gauge
6
Summary of Contents for ADHMB060BCV3VA
Page 37: ...UHM DHM SF 1H 37 Service Facts...
Page 39: ...UHM DHM SF 1H 39 Service Facts...
Page 41: ...UHM DHM SF 1H 41 Service Facts...
Page 47: ...UHM DHM SF 1H 47 Service Facts...
Page 49: ...UHM DHM SF 1H 49 Service Facts...
Page 51: ...UHM DHM SF 1H 51 Service Facts...
