Specifications

22
START-UP AND OPERATION
Introduction
After the system has been properly installed and con-
nected to gas, electrical, water supplies, and controls it
may then be started.
Start-up and Checkout Procedures
Mounting
Check mounting to see that unit is level and securely
supported before filling with water.
Piping (Gas)
Verify that all field and humidifier gas piping has been
tested for leaks. (Soap and water are not recommended
near gas valves.)
Piping (Steam, Drain, Water Supply)
Verify that all piping connections have been completed
as recommended and that water pressure is available.
Electrical
Verify that all wiring connections have been made in
accordance with all local codes and the enclosed GTS
®
wiring diagram.
Controls
Before proceeding with the start-up and operation, verify
that all control wiring has been completed as specified
and required for correct and safe operation of the GTS
Humidifier.
For your particular control system, refer to the manual
that was enclosed with the product shipment.
Also see the separate Installation Instructions and
Maintenance Operations Manual for the Controls for the
GTS and GTS-DI Gas-to-Steam Humidifiers.
Caution: Only qualified personnel should perform
the start-up procedure.
Outline of Operation
The GTS is a gas-fired humidifier that burns either
natural or propane gas to generate steam for humidifica-
tion. The unit consists of one or more burners which are
fitted into a heat exchanger. This heat exchanger is, in
turn, submerged in a tank of water. When there is a call
for humidity, the burners fire and generate steam until
the call for humidity ends. The GTS is compatible with
all types of DRI-STEEM dispersion devices including
RAPID-SORB
®
and ULTRA-SORB
®
.
Safety Systems
The GTS humidifier has a number of systems and
safeguards to ensure proper operation:
• First, when there is a call for humidity, all of the
combustion blowers must start. Each combustion
blower contains a centrifugal switch that closes
when the motor reaches a certain speed. If any one
of the switches fails to close, the GTS will not
operate.
• Once the blowers are running, there is a normally
closed pressure switch that senses the back pres-
sure on the blowers. This pressure switch tests for
a blocked flue condition. If the flue becomes
obstructed, this pressure switch will open, shutting
down the humidifier.
• During operation, the water level in the tank is
monitored by a probe system for standard water
units and a low water float for DI/RO units. These
water monitors tie into the microcontroller in the
control cabinet. If the water level ever drops below
a safe point, the humidifier is shut down.
• The water level in the tank is also monitored by a
redundant low water system that runs independent
of the microcontroller. This system is tied directly
into the power source for the burners. If this system
detects a low water condition, the humidifier is shut
down.
• In addition to monitoring the water level, there is a
temperature sensor located above one of the top
burners. If the water level drops too low and both
the main and redundant low water sensors fail to
detect it, the temperature sensor will shut the
humidifier down before an unsafe condition arises.
• For standard water systems, an additional low water
safety system exists. The microcontroller keeps
track of approximately how much water has left the
tank in the form of steam. If this total amount
exceeds a preset limit without the fill valve being
energized, a low water condition is assumed and the
humidifier is shut down. Each time the fill valve is
energized, the total is reset to zero. (This system is
not implemented on a DI/RO humidifier because the
fill valve is not of the electric-solenoid type. On a
DI/RO tank, a mechanical fill valve maintains the
proper water level. This fill valve runs independent
of the microcontroller. Therefore, there is no way to
reset the steam total to zero as the tank fills.)
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