Page 30
1019068-C
BURNER ORIFICE
This appliance is orificed at the factory for elevations up
to 2,000 ft. If installed above 2,000 ft., the BTU input
must be reduced 4% per 1,000 ft. See the following
orifice chart for the proper orifice for a specific elevation.
Orifice change must be completed by a qualified installer
or service technician.
PROPER BURNER FLAME
The burner flame may be observed by raising the sight
glass cover. A proper flame will have a dark blue inner
mantle that sits right on top of the burner with a lighter blue
outer mantle rising over the burner,
see Figure 12
. There
may be some yellow where the pilot flame and burner flame
meet. There is no primary air adjustment on the burner, and
proper flame is assured since the correct manifold pressure
and orificing has been done at the factory.
MAINTENANCE
ORDER KIT #49800
44-1 High Altitude Kit
Model
No.
0 to
2,000’
2,000’ -
4,000’
4,000’ -
6,000’
6,000’ -
8,000’
8,000’ -
10,000’
NATURAL GAS
Fig 11: Specific Elevations
CDV155D
48
49
50
51
52
CDV255D 2.45mm
41
42
43
44
CDV305D
37
37
38
40
42
FIG. 12
THERMOSTAT INSTALLATION
Follow the instructions included with the thermostat. If the thermostat is to be wall mounted, select a location in the
same room as the heater, approximately five feet above the floor on an inside wall where it won’t be affected by heat
or cold sources such as direct sunlight, televisions, fireplaces, hidden hot or cold water pipes, drafts, etc.
The thermostat must not be placed in an adjacent room. The furnace is equipped with a self-generating control
system; never connect to a 24-volt transformer or household electric system. Do not splice or attempt to use more
thermostat wire than is supplied. Connect thermostat wires to thermostat and mount thermostat to wall, run wire
to furnace, securing with insulated staples provided, and connect to valve terminals marked TH.
See Figure 10
on page 29.
4" - 5" Outer Flame
3/8" Inner Mantle
CDV25/33-D
3/8" Inner
Mantle
3"-
4"
Outer Flame
CDV15-D
