Armstrong World Industries HWC PREMIER 183 User Manual
Page 138
7-16
A C C E S S O R I E S
Magic-Pak: HW/HWC
SRM-HW/HWC 8/99
x
3600
x
=
Cubic Feet Per Revolution
BTU/HR
INPUT
# Seconds Per Revolution
Heating
Value
The heating value of your gas can be obtained from your local utility.
With proper manifold pressure achieved, cycle main burners on and off.
Ignition and extinction should be smooth and quiet. Burning back at the
orifice or flame popping back to the orifice can be corrected by adjusting
the air shutter to soften the flame.
Regulator - Propane
The furnace has a regulator in the gas valve. A regulator is also required
on the propane tank. Another regulator may be required at the house or
the unit.
The minimum permissible gas supply pressure to the furnace is 11" W.C.
for the purpose of input adjustment.
If at any time ignition is slow and the burner does not seem to be operat-
ing correctly, check manifold pressure. It should be between 10" to 10.5"
W.C.
The furnace is designed to obtain rated input at 10.0" W.C.
To check this pressure:
1.
Turn off the gas valve.
2.
Remove the plug on the valve.
3.
Install a water manometer.
Turn gas valve “ON”. If manifold pressure must be adjusted, remove cap
from pressure regulator and turn adjustment screw clockwise to increase
pressure, counterclockwise to reduce pressure. After checking pressure,
turn gas off, remove the manometer fitting and replace the pipe plug and
regulator cap. Put furnace in operation and leak check plug for leaks
using a soapy solution.
With proper manifold pressure achieved, cycle main burners on and off.
Ignition and extinction should be smooth and quiet. Burning back at the
orifice or flame popping back to the orifice can be corrected by adjusting
the air shutter to soften the flame.
Model
Size
Normal
Input
Btuh
High
Altitude
Input
Btuh
High
Altitude
Output
Btuh
Orifice Size
Natural
Propane
TABLE 7-8
AHALT390-1 Orifices
C
W
H
/
W
H
6
2
0
0
0
,
6
2
0
0
4
,
3
2
0
0
0
,
8
1
5
5
5
6
C
W
H
/
W
H
8
3
0
0
0
,
8
3
0
0
2
,
4
2
0
0
0
,
7
2
4
5
4
6
C
W
H
/
W
H
1
5
0
0
0
,
1
5
0
0
9
,
5
4
0
0
0
,
6
3
4
5
3
6
C
W
H
/
W
H
4
6
0
0
0
,
4
6
0
0
6
,
7
5
0
0
0
,
5
4
3
5
3
6