Trane GHND-SVX01A-EN - Manual (Page 18)

18 High Efficiency Propeller Fan Gas Unit Heater •
GHND-SVX01A-EN
Gas Supply Piping
Pipe Installation
ƽ
WARNING
Hazard of Explosion of Fire!
Heater installation for use with propane (LP-gas) must be made by a qualified LP-Gas Dealer or
LP-Gas Installer to ensure all appropriate codes, installation procedures, and precautions have
been followed. Failure to follow these instructions could result in death or serious injury.
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 (refer to Table
4). A field LP tank regulator must be used to limit the supply pressure to maximum
of 14 in. W.C. (3.5 kPa). All piping should be sized in accordance with the latest
edition of ANSI Standard Z223.1, National Fuel Gas Code; in Canada, according to
CGA-B149. See Tables 1 and 3 for correct gas supply 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. 5.Standard gas duct furnaces, optional two-stage unitsare supplied with a
combination valve which includes:
(a) Manual “A” valve (b) Manual “B” valve
(c) Solenoid valve (d) Pilot safety (e) Pressure regulator
and then pipe directly into combination valve (see Figure 4).
6. A 1/8 in. N.P.T. plugged tapping, accessible for test gauge connection, must be
installed immediately upstream of the gas supply connection to the appliance
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 main shutoff valve must be located external to the
jacket. See Figure 1, Pipe installation standard controls.
ƽ
WARNING
Hazard of Explosion!
Never use an open flame to detect gas leaks. Explosive conditions may occur. Use a leak test
solution or other approved methods for leak testing. Failure to follow recommended safe leak
test procedures could result in death or serious injury or equipment or property-only-damage.
8. Make certain that all connections have been adequately doped and tightened.
Pipe Installation