Trane GANE, Installation, Operation And Maintenance Manual, Page: 14 / 36

Installation
14 GANE-SVX001B-EN
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
Table 1 & Table 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
takeoff 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 5 ).
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 5 ).
8. Make certain that all connections have been
adequately doped and tightened.
CAUTION
Do not over tighten the inlet gas piping into the valve.
This may cause stresses that will crack the valve!
NOTICE
Use pipe joint sealant resistant to the action of
liquefied petroleum gases regardless of gas conducted.
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!
Figure 5. Pipe installation, standard controls
WARNING
Never use an open flame to detect gas leaks. Explosive
conditions may exist which may result in personal
injury or death!
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
(a)
(a) For single stage application only at normal altitudes.
Gas Type Natural Gas Propane (LP) Gas
Manifold Pressure
3.5 inch WC
(0.9 kPa)
10.0 inch WC
(2.5 kPa)
Supply Inlet
Pressure
14.0 inch WC Max.
(3.5 kPa)
14.0 inch WC Max.
(3.5 kPa)
5.0 inch WC Min.
(1.2 kPa)
11.0 inch WC Min.
(2.7 kPa)
D3631C