Installation, Start-Up, Adjustment and Maintenance Manual
37
4.2 GAS SUPPLY PIPING
All gas piping must conform to the latest edition of
National Fuel Gas Code ANSI Z223.1
and all local gas
piping codes. In Canada, the gas piping must conform to the
CGA Standard CAN1 B149.1
and
.2
,
"Installation Code for Gas Burning Appliances & Equipment"
and local codes. Your gas utility must be
contacted regarding local requirements, type and size of gas lines. Safe lighting and other performance
criteria were met with the gas manifold and control assembly provided on the chiller, when it underwent the
tests specified in the standards shown on the rating plate.
For Natural Gas the minimum Inlet gas pressure to the chiller is 5" W.C. and the maximum is 14” W.C. For
Propane Gas the minimum Inlet gas pressure to the chiller is 11" W.C. and the maximum is 14" W.C.
For size of gas connection to the unit, see Figure
12
.
Gas supply pressures higher than those stated above could damage the gas valve, resulting in a fire
hazard.
Vertical gas piping must be trapped and a means provided to drain condensate that may accumulate in the
piping during the cold season. Insulation may also be necessary for the gas piping to prevent excessive
accumulations of condensate.
An approved union should be installed in the gas line near the unit and down stream of any external shut-off
valve that may be required by local codes.
Be sure to use materials resistant to the LPG corrosive action when making pipe connections.
Use an approved sealing compound resistant to propane gas on all male pipe threads.
The chiller and its gas connections must be leaked tested before placing the chiller in operation.
The chiller and its individual shut-off valve must be disconnected from the gas supply piping system during
any pressure testing of the gas piping system at test pressures
in excess of 1/2 PSIg.
The chiller must be isolated from the gas supply piping system by closing its individual shut-off valve during
any pressure testing of the gas piping system at test pressures
equal to or less than 1/2 PSIg.
Figure 14
– TYPICAL GAS CONNECTION
APPROVED UNION
SEDIMENT TRAP
APPROVED GAS
SHUT-OFF VALVE
TO UNIT
FROM GAS
SUPPLY
WARNING