Gas Piping - Nortec GH Series Instaliation, User & Maintenance Manual

5. The required free area of supply air opening
is:
11 in. sq. (7,000 mm
2
)
for GH 100
20 in. sq. (13,000 mm?, for GH 200
40 in. Sq. (26,000 mm ), for GH 400
6. Excessive exposure to contaminated
combustion air will result in safety and
performance related problems. Known
contaminates include halogens, ammonia, and
chlorides, excessive dust, lime or dirt. Contact
NORTEC Technical Services if you have any
questions.
7. All surfaces are zero clearance to combustible
construction.
NOTES:
- The leveling legs must be left in place when
floor mounted on combustible material.
- The humidifier shall not be installed directly
on carpeting, tile or other combustible mate-
rial other than wood flooring.
8. For recommended clearances for servicing
refer to Figure #2.
9. Cabinet back and bottom contain air openings
to provide combustion air to the forced draft
blower. Either the back or bottom set of
openings must have at least 2" (50 mm)
clearance to allow for adequate combustion
air. For example, if the humidifier is floor
mounted, 2" clearance must be maintained to
the unit's back surface.
10. During installation it may be necessary to
cover the humidifier to prevent any dust or
other contaminants from entering the cabinet
when activities such as drilling are taking
place.
NOTE: Some insulating materials may be
combustible. Prior to installing this appliance examine
the area for insulating material. If this appliance is
installed in an insulated space, it must be kept free
and clear of insulating materials. If insulation is added
after the appliance is installed, it will be necessary to
examine the area again.
4-
GAS PIPING
The gas inlet pipe size to the appliance is:
1/2" NPT for GH 100
3/4" NPT for GH 200
3/4" NPT for GH 400
Provide an adequate size gas supply line.
Installation of piping must be in accordance with
local codes, and ANSI Z233.1 , "National Fuel Gas
Code," in the United States or CAN/CGA-B149
Installation Codes in Canada.
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
..... .. _ - T o Gas Line
Off Valve
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 and its individual shut-off valve
must be disconnected from the gas supply piping
system during any pressure testing of that system at
test pressures in excess of
~
psig (3.5 kPa).
Dissipate test pressure from the gas supply line
before reconnecting the humidifier and its manual shut
off valve to the gas supply line.