Installation and Maintenance Manual

11GBNE-SVX001A-EN
Figure 4 - Pipe Installation, Standard Controls
The appliance and its individual shutoff valve must be
disconnected from the gas supply piping system during any
pressure testing of that system in excess of 1/2 psig (3.5 kPa).
The appliance must be isolated from the gas supply
piping system by closing its individual manual shutoff
valve during any pressure testing of the gas supply
piping system at test pressures equal to or less than
1/2 psig (3.5 kPa).
Table 4 - Gas Piping Requirements
SINGLE STAGE GAS PIPING REQUIREMENTS*
GasType Natural Gas Propane (LP) Gas
Manifold 3.5 inch WC 10.0 inch WC
Pressure (0.9 kPa) (2.5 kPa)
14.0 inch WC Max. 14.0 inch WC Max.
Supply Inlet (3.5 kPa) (3.5 kPa)
Pressure
5.0 inch WC Min. 11.0 inch WC Min.
(1.2 kPa) (2.7 kPa)
*For single stage application only at normal altitudes.
1. Install the gas piping in accordance with applicable local
codes.
2. Check gas supply pressure. Each unit heater must be
connected to a manifold pressure and a gas supply
capable of supplying its full rated capacity as specified
in Table 4. A field LP tank regulator must be used to limit
the supply pressure to a maximum of 14 inches W.C. (3.5
kPa). All piping should be sized in accordance with the
latest edition of ANSI Standard Z223.1 (NFPA 54),
National Fuel Gas Code; in Canada, according to CSA
B149. See Tables 1 & 3 for correct gas piping size. If gas
pressure is excessive on natural gas applications, install
a pressure regulating valve in the line upstream from the
main shutoff valve.
3. Adequately support the piping to prevent strain on the
gas manifold and controls.
4. To prevent the mixing of moisture with gas, run the take-
off piping from the top, or side, of the main.
5. Standard Unit Heaters, optional two-stage units are
supplied with a combination valve which includes:
a. Manual "A" valve
b. Manual "B" valve
c. Solenoid valve
d. Pressure regulator
Pipe directly into the combination valve (see Figure 4).
6. Gas valve has a pressure test post requiring a
3/32 inch hex head wrench to read gas supply and
manifold pressures. Open 1/4 turn counterclockwise to
read, turn clockwise to close and reseat. A 5/16 inch ID
hose fits the pressure post.
7. Provide a drip leg in the gas piping near the gas unit
heater. A ground joint union and a manual gas shutoff
valve should be installed ahead of the unit heater
controls to permit servicing. The manual shutoff valve
must be located external to the jacket (See Figure 4).
8. Make certain that all connections have been adequately
doped and tightened.
NOTICE: Use pipe joint sealant resistant to the action of
liquefied petroleum gases regardless of gas conducted.
Installation (continued)
Pipe Installation
CAUTION
Do not over tighten the inlet gas piping into the valve. This may
cause stresses that will crack the valve!
WARNING
Check all pipe joints for leakage using a soap solution or other
approved method. Never use an open flame or severe personal
injury or death may occur!
WARNING
Never use an open flame to detect gas leaks. Explosive condi-
tions may exist which may result in personal injury or death!
D3631C
D3631C