Trane Gas Unit Heaters Wartungshandbuch

11

GBNE-SVX001A-EN

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).

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.

D3631C

D3631C