10
INSTALLATION
• Two stage gas valves (used on GTS®400, 200 and 100)
have a 10 second high fire stage and then drop to a
normal fire stage. Factory settings for natural gas are 5"
w.c. high, 3 1/2" w.c. normal. Factory settings for L.P. gas
are 8" w.c. high, 6" w.c. low. These pressures can be
checked on the combination gas valve at the out pressure
tap (see page 33).
Electrical
CAUTION:
Do not connect aluminum wire between disconnect
switch and humidifier. Use only copper wire.
WARNING:
The cabinet must have an uninterrupted or unbroken
ground according to National Electrical Code, ANSI/NFPA
70 and Canadian Electrical Code, CSA C22.1, or local
codes to minimize personal injury if an electrical fault
should occur. This may consist of electrical wire or
conduit approved for electrical ground when installed in
accordance with existing electrical codes. Do not use gas
piping as an electrical ground.
• GTS Humidifiers should be supplied with 120-volt AC,
60-Hz, 15-amp separately fused electrical service. The
GTS humidifier is equipped with a transformer to step
down the voltage to 24 VAC control voltage.
• When installed, the GTS humidifier must be electrically
grounded in accordance with local codes or, in the ab-
sence of local codes, with the National Electrical Code
ANSI/NFPA No. 70-1987. The electrical conductors shall
be Type MTW (105°C) AWG #14 wire for line voltage
(120V), with BLACK WIRE for HOT; WHITE WIRE for
NEUTRAL, GREEN WIRE for GROUND; and #18 gauge
for control wiring. All electrical components and wiring
must be protected from mechanical damage and water.
The control system requires an earth ground for proper
operation.
• The humidifier is adjusted for correct performance. Do
not alter fan or operate motors at reduced speed.
• The current characteristics, and capacity requirements
should be checked against the nameplates. All wiring
must be in accordance with all governing codes, and with
GTS wiring diagram located inside the control cabinet.
See table 13-1 for information on the various models.
• See page 14 for recommended knockout locations for
the electrical power supply and control wiring connections
on the control cabinet.
• See separate publication for the specific controller
furnished with this specific GTS humidifier.
Combustion and Ventilation Air
CAUTION:
Air for combustion must not be contaminated by
halogen compounds, which include fluoride, chloride,
bromide and iodide. These elements are found in
aerosol sprays, detergents, bleaches, cleaning sol-
vents, salts, air fresheners, and other household
products.
CAUTION:
The operation of exhaust fans, kitchen ventilation
fans, clothes dryers, or fireplaces could create a
negative pressure condition at the humidifier. Make-
up air must be provided for the ventilation devices, in
addition to that required by the humidifier.
• All fuel burning equipment must be supplied with air for
combustion of the fuel. Sufficient air MUST be provided
to ensure there will not be a negative pressure in the
equipment room or space.
• Provisions for adequate combustion and ventilation air
must be provided in accordance with Section 5.3, Air for
Combustion and Ventilation, of the National Fuel Gas
Code, ANSI Z223.1-1988, or applicable provisions of the
local building codes. Canadian installations must be
installed in accordance with sections 7.2, 7.3, and 7.4 of
the CAN/CGA.B149 Installation Codes, and all authorities
having jurisdiction.
Confined Space - All air
from inside the building;
conventional frame.
Brick or stone
construction with normal
infiltration. (Can only be
rarely used with larger
input units.)
Two openings, 1 square
inch per opening per
1000 BTU/hr. input.*
The minimum free area
of opening is 100 square
inches.
Confined Space - All air
from outside the building
through air ducts.
Two openings, 2 ducts, 1
square inch per opening
per 2000 BTU/hr. input.*
Confined Space - All air
from outside the
building, through wall
openings only (no
ducts.)
Two openings, 1 square
inch per opening per
4000 BTU/hr. input.*
Unconfined Space - All
air from outside the
building.
Same as confined
space, all air from
outside the building.*
Table 10-1: Location of Humidifier and Required Air
Openings to Confined Space
*Note the minimum dimension of any opening is three
inches.
GTS-IOM-1298.pdf 10 11/17/2009 3:57:03 PM
