ICP C9MPD User Manual

Single Stage Multi Position Furnace
Service
Manual
6
440 08 2001 02
Gas Pressure Testing Devices
Figure 5
MAGNEHELIC
MAX. PRESSURE 15 PSIG
0
510
15
INCHES OF WATER
Pressure Connections
Typical "U" Tube
Manometer
0
1
1
2
2
3
3
CHECKING MANIFOLD PRESSURE
1. Connect a manometer or Magnehelic gauge (0--12²
W .C. range) to the pressure tap on the “OUTLET” side
of the gas valve.
2. T urn gas “ON”, fire the furnace, and remove adjust-
ment cover (screw--cap).
3. Turn adjustment screw clockwise (IN) to INCREASE
pressure, and counterclockwise (OUT) to DECREASE
pressure.
4. At altitudes BELOW 2,000¢
¢¢
¢ set manifold pressure to
3.5² W .C. for Natural Gas, and 10² W.C. for L.P. Gas.
5. For Natural Gas units ABOVE 2,000¢
¢¢
¢, set manifold
pressure according to TABLE 2.
6. For L.P. Gas units ABOVE 2,000¢
¢¢
¢, insure that orifice
size has been changed (per “National Fuel Gas Code”
-- Appendix “F”) if gas supply has not already been de--
rated for altitude by the gas supplier.
7. For ALL UNITS ABOVE 8,000¢, contact the factory for
SPECIFIC de--rating information.
MANIFOLD PRESSURE AND ORIFICE SIZE FOR HIGH ALTITUDE APPLICATIONS
Table 2 NATURAL GAS
H
e
a
t
V
a
l
u
e
Elevation Above Sea Level
H
eat
V
a
l
ue
Btu/Cu.Ft.
0--1999
(²
²²
²×
××
×wc)
2000--2999
(²
²²
²×
××
×wc)
3000--3999
(²
²²
²×
××
×wc)
4000--4999
(²
²²
²×
××
×wc)
5000--5999
(²
²²
²×
××
×wc)
6000--6999
(²
²²
²×
××
×wc)
7000--7999
(²
²²
²×
××
×wc)
800 3.5 3.5 3.5 3.5 3.5 3.5 3.5
850 3.5 3.5 3.5 3.5 3.5 3.5 3.5
900 3.5 3.5 3.5 3.5 3.5 3.5 3.4
950 3.5 3.5 3.5 3.5 3.3 3.2 3.1
1000 3.5 3.4 3.3 3.2 3.0 2.9 2.8
1050 3.2 3.1 3.0 2.9 2.7 2.6 2.5
1100 2.9 2.8 2.7 2.6 2.5 2.4 2.3
Orifice Size #42 #42 #42 #42 #42 #42 #42
“CLOCKING” GAS METER (NATURAL GAS)
1. Check with gas supplier to obtain ACTUAL BTU con-
tent of gas.
2. T urn “OFF” gas supply to ALL other gas appliances.
3. T ime how many seconds it takes the smallest (normal-
ly 1 cfh) dial on the gas meter to make one complete
revolution.
4. Calculate input rate by using ACTUAL BTU content of
gas in formula shown in example.
Example
Natural G as
BTU Content
No. of Seconds
Per Hour
T i me Per Cubic
Foot in Seconds
BTU Per
Hour
1,000 3,600 48 75,000
1,000 x 3,600 ¸ 48 = 75,000 BTUH

ICP C9MPD Specifications

General

Brand	ICP
Model	C9MPD
Category	Furnace
Language	English