Raypak 751 Operations Instructions download pdf (Page 22)

Fig. 16: Connections

Gas Supply Connection

The boiler must be isolated from the gas supply piping

system by closing the manual shutoff valve during any

pressure testing of the gas supply piping system at

test pressures equal to or less than 1/2 PSIG. Relieve

test pressure in the gas supply line before reconnect-

ing the boiler and its manual shut off valve to the gas

supply line. FAILURE TO FOLLOW THIS PROCE-

DURE MAY DAMAGE THE GAS VALVES. Over

pressurized gas valves are not covered by warranty.

The boiler and its gas connections shall be leak tested

before placing the appliance in operation. Use soapy

water for leak test: DO NOT use open flame.

Gas Supply Pressure

A minimum of 7 in. WC and a maximum of 10.5 in. WC

upstream gas pressure is required under load and no

load conditions for natural gas. A minimum of 12 in.

WC and a maximum of 13 in. WC is required for

propane gas. The gas pressure regulator supplied is

for low pressure service. If upstream pressure

exceeds 14 in. WC, an intermediate gas pressure reg-

ulator, of the dead lockup type, must be installed.

When connecting additional gas utilization equipment

to the gas piping system, the existing piping must be

checked to determine if it has adequate capacity.

CAUTION: The boiler and its manual shutoff valve

must be disconnected from the gas supply during

any pressure testing of the gas supply system at test

pressures in excess of 1/2 PSIG (3.45 kPa).

CAUTION: Do not use Teflon tape on gas line pipe

thread. A pipe compound rated for use with Propane

gas systems is recommended. Apply sparingly only

on male pipe ends, leaving the 2 end threads bare.

CAUTION: Support gas supply piping with

hangers, not by the boiler or its accessories. Ensure

the gas piping is protected from physical damage

and freezing where required.

Model

1-1/2”

NPT

2” NPT

2-1/2”

NPT

3” NPT

751 65 200 N/A N/A

1001 35 125 200 N/A

1501 15 60 125 225

NOTE: The supply gas pressure must not fluctuate

by more than +/- 1.0 in. WC. For fluctuating gas sup-

ply contact the factory.

Maximum equivalent pipe length.

Natural gas 100 BTU/FT

.60 specific gravity @.5 in. WC pressure

drop.

Table I: Gas Pipe Sizing

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 56 57

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Raypak 751 Operations Instructions Page 22

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