Use and Care Manual
1019061-BPage 13
BURNER ORIFICE
This appliance is oriced 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
orice chart for the proper orice for a specic elevation.
Orice change must be completed by a qualied installer
or service technician.
PROPER BURNER FLAME
The burner ame may be observed by raising the sight
glass cover. A proper ame 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 ame and burner ame
meet. There is no primary air adjustment on the burner, and
proper ame is assured since the correct manifold pressure
and oricing has been done at the factory.
MAINTENANCE
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
CDV155D 48 49 50 51 52
CDV255D 2.45mm 41 42 43 44
CDV305D 37 37 38 40 42
CDV156D 1.2mm 56 57 59 60
CDV256D 1.55mm 54 54 55 55
CDV306D 1.65mm 51 52 52 53
PROPANE GAS
FIG. 12
THERMOSTAT INSTALLATION
Only for Models: CDV155D, CDV156D, CDV255D, CDV256D, CDV305D & CDV306D
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 ve feet above the oor on an inside wall where it won’t be affected by heat
or cold sources such as direct sunlight, televisions, replaces, 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 12.
4" - 5" Outer Flame
3/8" Inner Mantle
3/8" Inner
Mantle
3"-
4"
Outer Flame