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
3
.60 specific gravity @.5 in. WC pressure
drop.
Table I: Gas Pipe Sizing
Summary of Contents for 751
Page 2: ...2...
Page 6: ...6 Component Locations Fig 1 Component Locations...
Page 15: ...15 Fig 6 Dual Boiler Piping Fig 7 Dual Boiler Piping with CHX...
Page 20: ...20 Fig 13 Single Boiler Pool Application Fig 14 Single Boiler Pool Application with CHX...
