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INSTALLING YOUR FURNACE
ORIFICE SIZES
The efficiency rating of this appliance is a product Annual
Fuel Utilization Efficiency rating determined under
continuous operating conditions and was determined
independently of any installed system.
This furnace is equipped with a automatically controlled
modulating valve and power burner. For elevations above
2,000 feet, adjust thermostat settings to the appropriate
elevation during installation.
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 14, based on
the length of the run from the gas meter to the unit.
FIGURE 14 - PIPE CAPACITY
PIPE CAPACITY - BTU/hr. WITH FITTINGS
NATURAL GAS
LENGTH
OF PIPE
FEET
1/2"
20
92,000
40
63,000
50,000
60
All piping must comply with local codes and ordinances
or with the National Fuel Gas Code (ANSI Z223.1 NFPA No.
54), whichever applies. (In Canada: CAN/C.GA B149). Refer
to FIGURE 15 for the general layout of the unit. It shows the
basic fittings needed.
The following rules apply:
1.
Use new, properly reamed steel or black iron pipe and
fittings free of metal chips and debris that are approved by
local codes. Metal chips and debris can damage the valve.
2.
Do not thread pipe too far. Valve distortion or malfunction
may result from excess pipe within the gas control valve.
Apply a moderate amount of good quality dope to the
pipe only. Leave the two end threads bare. (Figure 17).
3.
Use ground joint unions.
4.
Install a drip leg (sediment trap) to trap dirt and moisture
before it can enter the gas valve. The nipple must be a
minimum of 3-inches long.
5.
Install a manual shutoff valve.
6.
Provide a 1/8" NPT test gauge connection immediately
before the gas supply connection to the furnace.
18
CARMEL
TM
AC2030TNA TOP VENT GAS WALL HEATER
PIPE SIZE
3/4"
1"
190,000
350,000
130,000
245,000
105,000
195,000
GAS CONNECTION
Use two pipe wrenches when making the connection to
the valve to prevent turning and/or damage to the valve
or orifice. Use one pipe wrench to maintain the valve's
position and use another to install the gas nipple and line.
Refer to Figure 16 below.
FIGURE 16 - VALVE CONNECTION
USE FIRST WRENCH
TO HOLD VALVE
FIRMLY IN PLACE.
USE SECOND WRENCH TO
HOLD FITTING. TURN
WRENCH COUNTER-
CLOCKWISE TO TIGHTEN
THE FITTING TO THE 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 including orifice and manifold.
Test all piping for leaks. When checking gas piping to the
furnace with gas pressure less than 1/2 PSI, shut off manual
gas valve to the furnace. If gas piping is to be checked with
the pressure at or above 1/2 PSI, the furnace and manual
shutoff valve must be disconnected during testing. (SEE
WARNING). Apply soap solution (or a liquid detergent) to
each joint. Bubbles forming indicate a leak. Correct even
the slightest leak at once.
WARNING: Danger of property damage, bodily injury
or death. Never use a match or open flame to test for
leaks. Never exceed specified pressures for testing. Higher
pressures may damage the gas valve and cause over-
firing which may result in component(s) failure. Never
attempt start-up of unit before thoroughly ventilating the
area and smelling near the floor for gas odor.
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