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Code," in the United States or CAN/CGA-B 149
Installation Codes in Canada.
The following table indicates the maximum and
minimum allowable gas pressures for the Gas
Humidifier.
INCHESW.C.
GAS
MIN.
MAX.
Natural
4.5
14.0
,
Propane
9.0
14.0
The gas inlet pipe size to the appliance is:
~"NPT
for GH 100
3/4" N PT for GH 200
1"
NPT for GH300/400
Provide an adequate size gas supply line.
When black iron gas pipe is used, a sediment trap
must be located ahead of the humidifier gas controls.
In all installations, a manual shut off valve, located
outside the cabinet, must be installed. See Figure
#4.
Figure #4
Leak test all gas connections using a commercial
soap solution made to detect leaks. Bubbles indicate
gas leakage. Seal all leaks before placing the
humidifier in operation.
WARNING: Never use an open flame to check for
gas leaks. If a leak does exist, a fire or explosion
could occur, resulting in damage, injury or death.
The appliance must be isolated from the gas
supply piping system by closing its individual manual
shut-off valve during any pressure testing of the gas
supply piping system at test pressures equal to or
greater than 14" W.c. (3.5 kPa).
Dissipate test pressure from the gas supply line
before re-opening the manual shut off valve to the
appliance.
- 5 -
NOTES:
1.
Failure to follow this procedure may damage
the gas valve. Over pressured gas valves are
not covered by warranty.
2.
DO NOT use Teflon tape on gas line pipe
threads. A flexible sealant suitable for use
with Natural Gas and Propane Gas is
recommended.
3.
Plan gas supply piping so it will not interfere
with removal of gas valves or blower
assemblies and front or side service doors.
The gas valve is provided with pressure taps to
measure gas pressure upstream and downstream,
(manifold pressure). The minimum gas pressure
shown is for the purpose of input adjustment.
A 1/8" NPT plugged tapping, accessible for test
gage connection, must be installed immediately
upstream of the gas supply connection to the
appliance. The humidifier shall not be connected to a
chimney flue serving any other appliances.
NOTE FOR OUTDOOR ENCLOSURE: Gas lines
should be routed through the bottom of the enclosure
For direct vent units, the combustion supply air
opening is not required to the room where the
appliance is installed since the combustion air
requirements will be provided through the inlet air duct
(see installation notes below). Some ventilation is
required for cooling of the electronic components
AIR MANIFOLD/CONNECTOR HOSE
INSTALLATION FOR DIRECT VENT
All direct vent units are shipped with the air
manifold and connector hoses packaged separately.
The connector hoses and air manifold must be
installed by a qualified installer prior to commissioning
the unit.
Figure #5
Hose
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