Raypak 902B Manual De Usuario

at  test  pressures  equal  to  or  less  than  1/2  psi  (3.45
kPa). Relieve test pressure in the gas supply line prior
to  reconnecting  the  heater  and  its  manual  shut-off
valve to the gas supply line. FAILURE TO FOLLOW
THIS  PROCEDURE  MAY  DAMAGE  THE  GAS
VALVES.  Over  pressurized  gas  valves  are  not  cov-
ered by warranty. The heater and its gas connections
shall  be  leak-tested  before  placing  the  appliance  in
operation. Use soapy water for leak test. DO NOT use
an open flame.

Reversing Gas Supply Connection

Reversing the standard fuel connection from the left-
hand to the right-hand side is a simple field operation.

1. Disconnect all electrical power from the heater (if

applicable).

2. Disconnect the main gas pipe from the heater (if

applicable).

3. Remove the left and right front panels from the

heater.

4. Locate the main gas line that traverses across the

heater above the manifold risers.

5. Remove the pipe cap from the right-hand end of

the main gas line.

Gas Supply

Gas  piping  must  have  a  sediment  trap  ahead  of  the
heater  gas  controls,  and  a  manual  shut-off  valve  lo-
cated  outside  the  heater  jacket.  It  is  recommended
that a union be installed in the gas supply piping adja-
cent  to  the  heater  for  servicing.  A  pounds-to-inches
regulator  must  be  installed  to  reduce  the  gas  supply
pressure to  a maximum of 10.5 in. WC for natural gas
and 13.0 in. WC for propane gas. The regulator should
be  placed  a  minimum  distance  of  10  times  the  pipe
diameter up-stream of the heater gas controls. Refer
to Table K for maximum pipe lengths.

Gas Supply Connection

The heater must be isolated from the gas supply pip-
ing system by closing the manual shut-off valve during
any pressure testing of the gas supply piping system

CAUTION: The heater must be disconnected from

the gas supply during any pressure testing of the gas
supply system at test pressures in excess of 1/2 psi
(3.45 kPa).

Fig. 16: Gas Supply Connection

CAUTION: Do not use Teflon tape on gas line pipe

thread. A pipe compound rated for use with natural
and propane gases is recommended. Apply
sparingly only on male pipe ends, leaving the two
end threads bare.

CAUTION: Support gas supply piping with

hangers, not by the heater or its accessories. Make
sure the gas piping is protected from physical
damage and freezing, where required.

3/4"

1”

1-1/4”

1-1/2”

2”

2-1/2”

Model

No.

302B

150

380

360

402B

100

260

250

502B

150

130

360

500

652B

100

250

340

752B

180

260

600

902B

110

150

360

400

Table K: Maximum Equivalent Pipe Length

DANGER: Make sure the gas on which the heater

will operate is the same type as specified on the
heater’s rating plate.

Natural gas – 1,000 BTU per ft

, .60 specific gravity at 0.5 in. WC pressure drop

Propane gas – 2,500 BTU per ft

, 1.53 specific gravity at 0.6 in. WC pressure drop