20
Gas Supply Connections
Gas piping must have a sediment trap ahead of the heater
the heater jacket. All gas piping should be tested after
installation in accordance with local codes.
GAS INLET
3" MIN
(7.6 cm)
SEDIMENT
TRAP
UNION
REAR
JACKET
3/4 NPT
NIPPLE
MANUAL
BALL
VALVE
BY INSTALLER
Figure 15. Gas Supply Connections
A
CAUTION:
must be disconnected from the gas supply during any
pressure testing of that system at test pressures in
excess of 1/2 psi (3.45 kPa). Dissipate test pressure in
the gas supply line before reconnecting the heater and
TO FOLLOW THIS PROCEDURE MAY DAMAGE THE
GAS VALVE. OVER-PRESSURIZED GAS VALVES ARE
NOT COVERED 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
NOTE:
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.
Supply Pressures
load conditions must be provided for natural gas. A
between static pressure and full load.
Set actual gas manifold pressure based on CO emissions,
either natural or propane gas.
Gas Pressure Adjustment Locations
+ = MORE GAS
–
= LESS GAS
GAS
INLET
F10330
Figure 16. Gas Valve
Pipe Sizing For Gas Connections
Maximum Equivalent Pipe Length, ft. (m)
NAT PRO NAT PRO NAT PRO NAT PRO
*
(8.8)
Pressure Drop.
Pressure Drop.
the gas valve in addition to the sediment trap.
Table K. Gas Line Sizing
Heat Exchanger Pressure
Drop Tables
Heat Exchanger with External Automatic Bypass
WATER FLOW
GPM (lpm)
HEAD LOSS
FT. WC. (kPa)
Table L. Heat Exchanger Pressure Drop
APPROVED
UNCONTROLLED DOCUMENT IF PRINTED
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