Rheem Raypak Delta Limited 399B, Installation And Operation Manual

Page: 19 / 67

19
Gas Supply Connection
The heater must be isolated from the gas supply piping
system by closing the manual shut-off valve during any
pressure testing of the gas supply piping system at test
pressures equal to or less than 1/2 psi (3.45 kPa). Re -
lieve test pressure in the gas supply line prior to recon-
necting the heater and its manual shut-off valve to the
gas supply line. FAILURE TO FOLLOW THIS PRO-
CEDURE MAY DAMAGE THE GAS VALVES . Over
pressurized gas valves are not covered by warranty.
A
CAUTION: The heater must be disconnected
from the gas supply during any pressure testing
of the gas supply system at test pressures in ex-
cess of 1/2 psi (3.45 kPa).
Fig. 14: Gas Supply Connection
A
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.
Table I: Maximum Equivalent Pipe Length
Natural gas – 1,000 BTU per ft
3
, .60 specific gravity at 0.5 in. WC pressure drop
Propane gas – 2,500 BTU per ft
3
, 1.53 specific gravity at 0.6 in. WC pressure drop
Model
No.
3/4” 1” 1-1/4” 1-1/2” 2” 2-1/2” 3” 4”
N P N P N P N P N P N P N P N P
399B 15 25 60 100 260 250
499B 65 150 130 360 500
649B 45 100 95 250 340
749B 35 80 75 180 260 600
899B 20 45 45 110 150 360 400
989B 120 300 300
1259B 75 180 170 325 560
1529B 50 120 125 250 400
1799B 40 100 100 225 340
1999B 30 80 75 175 260
2069B 30 80 75 175 260
2339B 20 55 55 135 160 400 600
Gas piping must have a sediment trap ahead of the
heater gas controls, and a manual shut-off valve locat -
ed outside the heater jacket. It is recommended that a
union be installed in the gas supply piping adjacent 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 I for
maximum pipe lengths.
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.