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PY5G--B: Installation Instructions
EXAMPLE: Assume that the size of test dial is 1 cu ft, one revolution
takes 32 sec, and the heating value of the gas is 1050 Btu/ft
follows:
1. 32 sec. to complete one revolution.
2. 3600 ¸ 32 = 112.5.
3. 112.5 x 1 =112.5 ft3 of gas flow/hr.
4. 112.5 x 1050 = 118,125 Btuh input.
If the desired gas input is 115,000 Btuh, only a minor change in the
manifold pressure is required.
Observe manifold pressure and proceed as follows to adjust gas input:
1. Remove regulator cover screw over plastic adjustment screw on gas
valve (See
Fig.
16).
2. Turn plastic adjustment screw clockwise to increase gas input, or
turn plastic adjustment screw counterclockwise to decrease input
(See
Fig.
16). Manifold pressure must be between 3.2 and 3.8 IN.
WC.
WARNING
!
FIRE AND UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal injury or death
and/or property damage.
Unsafe operation of the unit may result if manifold pressure is outside
this range.
Nameplate
0 to 2000 ft
Input (Btu/hr)
(0-610 m)
40000
60000
90000
115000
115000
127000
127000
*. In the U.S.A., the input rating for altitudes above 2000 ft (610m) must be reduced by 4% for each 1000 ft (305 m) above sea level.
In Canada, the input rating for altitudes from 2001 to 4500 ft (611 to 1372 m) above sea level must be derated by 10% by an authorized gas conversion station or dealer.
For Canadian Installations from 2000 to 4500 ft (610-1372 m), use U.S.A. column 2001 to 3000 ft (611 to 914 m).
HEATING INPUT
NUMBER OF
(BTUH)
ORIFICES
40,000
60,000
90,000
115,000
130,000
*. Based on altitudes from sea level to 2000 ft (610 m) above sea level. In U.S.A. for altitudes above 2000 ft (610 m), reduce input rating 4 percent for each additional 1000 ft (305
m) above sea level. In Canada, from 2000 ft (610 m) above sea level to 4500 ft (1372 m) above sea level, derate the unit 10 percent.
†. When a unit is converted to propane, different size orifices must be used. See separate, natural-to-propane conversion kit instructions.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
3
. Proceed as
Table 6 – High Altitude Compensation, Natural Gas - All Models
Rated Heating Input (Btu/hr), Natural Gas at Installation Altitude Above Sea Level, U.S.A.
2001 to 3000 ft*
(611 to 914 m)
40000
36000
60000
54000
90000
81000
103500
114300
Table 7 – Heating Inputs
GAS SUPPLY PRESSURE (IN. W.C.)
Natural
Min
2
4.0
3
4.0
3
4.5
3
4.5
3
4.5
3. Replace regulator cover screw on gas valve (See
4. Turn off gas supply to unit. Remove manometer from pressure tap
and replace pipe plug on gas valve. (See
unit and check for leaks.
Measure Manifold Pressure (Propane Units)
Refer to propane kit installation instructions for properly checking gas
input.
NOTE: For installations below 2,000 ft (610 m), refer to the unit rating
plate for proper propane conversion kit. For installations above 2,000 ft
(610 m), contact your distributor for proper propane conversion kit.
Check Burner Flame
With control access panel (see
heating operation. Watch the burner flames to see if they are light blue
and soft in appearance, and that the flames are approximately the same
for each burner. Propane will have blue flame (See
Maintenance section for information on burner removal.
3001 to 4000 ft
(915 to 1219 m)
34400
51600
77400
98900
109200
*
Propane
Max
Min
13.0
11.0
13.0
11.0
13.0
11.0
13.0
11.0
13.0
11.0
19
Fig.
Fig.
25) removed, observe the unit
4001 to 5000 ft
(1220 to 1524 m)
32800
49200
73800
94300
104100
MANIFOLD PRESSURE
(IN. W.C.)
*†
Max
Natural*
13.0
3.2~3.8
13.0
3.2~3.8
13.0
3.2~3.8
13.0
3.2~3.8
13.0
3.2~3.8
Fig.
16).
14.) Turn on gas to
Fig.
15). Refer to the
*
5001 to 6000 ft
(1524 to 1829 m)
31200
46800
70200
89700
99100
Propane*†
10.0~11.0
10.0~11.0
10.0~11.0
10.0~11.0
10.0~11.0
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