Specifications
Page 22
F-Proper Gas Flow
To check for proper gas flow to burners, determine Btuh input
from unit rating plate or table 6. Divide this input rating by the
Btuh per cubic foot of available gas. Result is the number of
cubic feet per hour required. Determine the flow of gas
through gas meter for two minutes and multiply by 30 to get
hourly flow of gas to the burners.
NOTE - To obtain accurate reading, shut off all other gas
appliances connected to meter.
TABLE 6
Unit Fuel Stage
Input
Btuh
Output
Btuh
Input
(ft.
3
/hr.)
GCS24
1353-270
1603270
Nat.
L.P.G.
GCS24
1353-270
1603270
1st
2nd
1st
2nd
170,000
270,000
132,500
216,000
170,000
236,250
132,500
192,500
G-High Altitude Derate
Units With Adjustable Regulator Only
(Honeywell Gas Valve)
The maximum input may be reduced by up to 20 percent on
A.G.A. units equipped with adjustable (Honeywell) gas valves
and operating on natural gas. See table 7.
To derate the unit use the following instructions. If high altitude
conditions are present, also follow the instructions in table 7.
Derate Procedure:
1- Check manifold pressure at the gas valve pressure tap
with unit operating at high fire (2nd stage).
2- To reduce maximum input, turn regulator adjusting screw
(figure 20) counterclockwise.
3- Re-check manifold pressure.
TABLE 7
If the heating value of the gas does not exceed the values listed in
this table, derating of unit is not required. Should the heating value
of the gas exceed the table values, or if the elevation is greater than
6,000 ft. above sea level, it will be necessary to derate the unit. Len
nox requires that derate conditions be 4 percent per thousand feet
above sea level. Thus at an altitude of 4000 feet, if the heating val
ue of the gas exceeds 1000 Btu/cubic ft., the unit will require a 16
percent derate.
HIGH ALTITUDE DERATE
Elevation Above
Sea Level (Feet)
Maximum Heating
Value (Btu/cubic ft.
5001-6000
4001-5000
3001-4000
2001-3000
Sea Level - 2000
900
950
1000
1050
1100
H-Inshot Burner
Air shutters are factory set for maximum air and cannot be ad
justed. Air shutters should always be fully open. Always oper
ate unit with access panel in place. A peep hole is furnished in
the heating access panel for flame viewing. The flame should
be blue with yellow streaks.
Figure 24 shows how to remove burner assembly.
1- Turn off power to unit and shut off gas supply.
2- Remove screws as shown in figure 24.
3- Slide each burner off its orifice.
4- Clean and reassemble (reverse steps 1-3).
5- Be sure to secure all wires and check plumbing.
6- Turn on power to unit. Follow lighting instructions at
tached to unit and operate unit in heating mode.
Check burner flames. They should be blue with yel
low streaks.
BURNER REMOVAL AND
ELECTRODE/SENSOR ORIENTATION
BURNER
AIR SLOTS
ORIFICE
OPENING
ELECTRODE/
FLAME SENSOR
ASSEMBLY
REMOVE SCREWS
TO REMOVE
ELECTRODE/SENSOR
REMOVE
SCREW
TO REMOVE
BURNERS
FIGURE 24
NOTE-If the unit is operated with the heating access panel
off and burners cold, the burner sound will increase due to
cold, dense primary air. This is normal and will subside
when heat exchanger warms up during operation. The
sound will be further reduced with the access panel in
place.
I-Heat Exchanger
To Access or Remove Heat Exchanger From Unit:
1- Turn off gas and electric power.
2- Remove access panel and unit end panel.
3- Remove gas valve, manifold assembly and burn
ers.
4- Remove combustion air blower and flue box. Pay
careful attention to the order in which gaskets and ori
fice are removed.
5- Support heat exchanger (to prevent it from falling
when final bolts are removed.)
6- Remove bolts supporting heat exchanger.
7- To install heat exchanger, reverse procedure. Be
sure to secure all wires and check plumbing and
burner plate for airtight seal. Bolts must be torqued to
35 in.lbs. to ensure proper operation.