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INSTALLING YOUR FURNACE
On natural gas the manifold pressure should be 4 inches
water column. The manifold pressure should be 10.5
inches water column for propane gas. See page 19 for
operation above 2,000 feet altitude. Orifice change may
be required to suit gas supplied. Check with your local
gas supplier.
ORIFICE SIZES
Furnace Technical Information, page 25, shows the correct
orifice sizes for the different input ratings when using
natural or propane gas.
GAS PIPING
The gas supply line must be of adequate size to handle
the BTU/hr. requirements and length of the run for the
unit being installed.
Determine the minimum pipe size from Figure 23, basing
the length of the run from the gas meter or source to the
unit.
FIGURE 21 - LEFT SIDE GAS INLET
18
COUNTERFLOW TOP VENT GAS WALL HEATER
FIGURE 22 – PROPER PIPING PRACTICE
PROPER PIPE
THREADING
INCORRECT
THREADING
OVER-THREADED
All piping must comply with local codes and ordinances or
with the National Fuel Gas Code (ANSI Z223.1), whichever
applies. In Canada: Follow CAN 1(B149 Installation Code.
Refer to Figure 21, for the general layout at the unit. It
shows the basic fittings needed.
The following rules apply:
1.
Use new, properly reamed pipe free from metal chips
and debris such as steel or black iron pipe. Use fittings
approved by local codes.
2.
Do not thread pipe too far. Valve distortion or mal
function may result from excess pipe within
control. Apply moderate amount of good quality
dope to pipe only, leaving 2 end threads bare. If
propane gas installation, use compound resistant to
action of liquefied petroleum gases.
3.
Use ground joint unions.
4.
Install a drip leg to trap dirt and moisture before it
can enter the gas valve. Drip leg must be a minimum
of 3 inches long.
5.
Install a manual shut-off valve.
6.
Provide a 1/8" NPT test gauge connection immediately
before the gas supply connection to the furnace.
GAS CONNECTION
If installation is for propane gas, have propane gas installer
use two-stage regulation and make all connections from
storage tank to furnace. Use two pipe wrenches when
making the connection to the valve to prevent turning or
damage to gas valve.
Connections between the manual shutoff valve and
burner control assembly can be made with an A.G.A. /
C.G.A. design certified flexible connector if allowed by local
codes. Drip leg and ground joint unions are still required.
Tighten all joints securely.
2 THREADS EXPOSED
SEALANT THIN
ENOUGH TO SHOW
THREADS
DAMAGED
SEALANT
THREADS
PAST TIP
SEALANT
TOO THICK
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