Installation Manual
28
T
O
AVOID
POSSIBLE
UNSATISFACTORY
OPERATION
OF
EQUIPMENT
DAMAGE
DUE
TO
UNDERFIRING
OR
EQUIPMENT
,
USE
THE
PROPER
SIZE
OF
NATURAL
/
PROPANE
GAS
PIPING
NEEDED
WHEN
RUNNING
PIPE
FROM
THE
METER
/
TANK
TO
THE
FURNACE
.
WARNING
to the natural reduction in the density of both the gas fuel and
combustion air as altitude increases. The kit will provide the
range.
High altitude kits are purchased according to the installation
altitude and usage of either natural or propane gas. Consult
not derate the furnace by adjusting the manifold pres-
rating plate. The combination of the lower air density and
from drawing the proper amount of air into the burner. This
yellow tipping.
must be determined based upon the BTU/ft
3
content of the
regardless of the BTU/ft
3
content of the fuel used. Consult
on L.P. gas, an LPM-07 LP Conversion kit must be used.
The indicated kit must be used to insure safe and proper
furnace operation. All conversions must be performed by
This unit is equipped with a 24 volt gas valve controlled during
furnace operation by the integrated control module. As shipped,
-
ible for use with propane gas by replacing the regulator spring
with a propane gas spring from an appropriate manufacturer’s
propane gas conversion kit. Taps for measuring the gas supply
pressure and manifold pressure are provided on the valve.
position. Refer to the lighting instructions label or Startup
Procedure & Adjustment for use of this control during start
up and shut down periods.
The gas piping supplying the furnace must be properly sized
length of the run. The gas line installation must comply with
local codes, or in their absence, with the latest edition of the
B149.1-15 in Canada.
To connect the furnace to the building’s gas piping, the
installer must supply a ground joint union, drip leg, manual
In some cases, the installer may also need to supply a tran-
sition piece from 1/2” pipe to a larger pipe size.
The following stipulations apply when connecting gas piping.
Refer to Gas Piping Connections
connections to the furnace.
• Gas piping must be supported external to the furnace
cabinet so that the weight of the gas line does not
distort the burner rack, manifold or gas valve.
•
chamfered, reamed, and free of burrs and chips. If
old pipe is used, be sure it is clean and free of rust,
scale, burrs, chips, and old pipe joint compound.
•
• Use ground joint unions.
• Install a drip leg to trap dirt and moisture before
it can enter the gas valve. The drip leg must be a
minimum of three inches long.
•
gauge connection, immediately upstream of the gas
supply connection to the furnace.
• Always use a back-up wrench when making the
connection to the gas valve to keep it from turning.
The orientation of the gas valve on the manifold must
be maintained as shipped from the factory. Maximum
torque for the gas valve connection is 375 in-lbs;
excessive over-tightening may damage the gas valve.
•
and unit within six feet of the unit. If a union is
installed, the union must be downstream of the
the furnace.
• Tighten all joints securely.