Robur GAHP Line AR Series, Installation, Use And Maintenance Manual

Page: 41 / 100

Plumbing installer section
Ed. 2014-08
37
3.4 GAS SUPPLY SYSTEM
The appliance is designed to run on natural gas and L.P.G.
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.
Adequate combustion and ventilation air have to be provided, in accordance with
section 5.3 “Air for Combustion and Ventilation” of the National Fuel Gas Code,
ANSI Z223.1, appropriate Sections of the Natural Gas Installation Code, CAN/CGA-
B149.1, or the Propane Installation Code, CAN/CGA-B149.2, or applicable
provisions of the local building codes.
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 4 on page 14.
Supplying gas to the appliance at higher pressures than those indicated above can
damage the gas valve, giving rise to a situation of danger.
The installation of gas supply pipes must be carried out in compliance with norms
and current regulations.
L.P.G. may cause corrosion. The connectors between the pipes must be made of a
material that is resistant to this corrosive action.
Vertical gas pipes must be equipped with a siphon and provided with a drain for the
condensate that may form inside the pipe during cold periods. It may also be necessary to
insulate the gas pipe to prevent the formation of excessive 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