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5
PRODUCT DESIGN
quired due to the natural reduction in the density of both the
gas fuel and combustion air as altitude increases. The kit
will provide the proper design certified input rate within the
specified altitude range.
High altitude kits are purchased according to the installa-
tion altitude and usage of either natural or propane gas. Refer
to the chart above for a tabular listing of appropriate altitude
ranges and corresponding manufacturer’s high altitude Natu-
ral Gas and Propane Gas kits. For a tabular listing of appro-
priate altitude ranges and corresponding manufacturer's High
Altitude Pressure Switch kits, refer to either the Pressure
Switch Trip Points & Usage Chart in this manual or the Ac-
cessory Charts in Service Instructions.
Single Stage Thermostat
A single-stage thermostat with only one heating stage may
be used to control this furnace. The application of a single-
stage thermostat does not offer “true” thermostat-driven two-
stage operation, but provides a timed transition from low to
high fire. The furnace will run on low stage for a fixed period
of time before stepping up to high stage to satisfy the
thermostat’s call for heat. The delay period prior to stepping
up can be set at either a fixed 5 minute time delay or a load
based variable time between 1 and 12 minutes (AUTO mode).
If the AUTOmode is selected, the control averages the cycle
times of the previous three cycles and uses the average to
determine the time to transition from low stage to high stage.
To use a single-stage thermostat, turn off power to the fur-
nace, move the thermostat selection DIP switch to the OFF
position. Set the desired transition time by setting the tran-
sition delay DIP switch to the desired ON/OFF position. Turn
power back on. Refer to the following figure.
3
4
Thermostat
Stage Delay
Move to the ON position
to select two-stage
thermostat or OFF to
select single stage
thermostat
Move to the ON position
to select Auto transition
delay or OFF for 5 minute
transition delay
Heat OFF Delay
DIP Switches
ON OFF
S1
1
LPM-05* supports White-Rodgers 2-stage valves only
2
LPM-06* supports Honeywell and White-Rodgers 2-stage valves
Natural
Propane
Natural
Propane
Natural
Propane
GMVC950453BX*
GMVC950704CX*
AMVC950453BX*
AMVC950704CX*
No
Change
LPM-05*
(1)
LPM-06*
(2)
#55 Orifice
No
Change
HANG13
#44
Orifice
HALP11
#56
Orifice
HAPS28
HANG14
#45
Orifice
HALP11
#56
Orifice
HAPS28
GMVC950905CX*
AMVC950905CX*
No
Change
LPM-05*
(1)
LPM-06*
(2)
#55 Orifice
No
Change
N/A N/A N/A N/A N/A N/A
GMVC950905DX*
GMVC951155DX*
AMVC950905DX*
AMVC951155DX*
No
Change
LPM-05*
(1)
LPM-06*
(2)
#55 Orifice
No
Change
HANG13
#44
Orifice
HALP11
#56
Orifice
HAPS29
HANG14
#45
Orifice
HALP11
#56
Orifice
HAPS29
GCVC90704CX*
GCVC90905DX*
GCVC91155DX*
ACVC90704CX*
ACVC90905DX*
No
Change
LPM-05*
(1)
LPM-06*
(2)
#55 Orifice
No
Change
HANG13
#44
Orifice
HALP11
#56
Orifice
HAPS29
HANG14
#45
Orifice
HALP11
#56
Orifice
HAPS31
GCVC950714CX*
GCVC950915DX*
ACVC950714CX*
ACVC950915DX*
No
Change
LPM-05*
(1)
LPM-06*
(2)
#55 Orifice
No
Change
N/A N/A N/A N/A N/A N/A
ID Blw r
Pressure
Sw itch
Gas Orifices
9,001 - 11,000 Feet
"STANDARD" and "HIGH ALTITUDE" KITS
Furnace
ID Blwr
Pressure
Switch
Gas Orifices
0 - 7,000 Feet
(Standard Altitude)
7,001 - 9,000 Feet
Gas Orifices
ID Blwr
Pressure
Switch