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DRISTEEM GTS HUMIDIFIER INSTALLATION AND OPERATION MANUAL
The GTS humidifi er has a number of safeguards to ensure proper operation:
• When there is a call for humidity, all of the combustion blowers must start. Each combustion
blower sends a signal to the microprocessor relaying its speed. If the speed is outside an
acceptable range, the GTS will not operate.
• The negative-pressure gas valves used on the GTS humidifi er are designed to keep a constant
ratio of air and gas throughout the operating range of the blower. If the blower fails to run, the
GTS humidifi er will shut down due to a blower fault.
• If the fl ue becomes blocked, the blocked fl ue sensor will shut down the humidifi er.
• During operation, the water level in the tank is monitored by a probe system for
tap/softened water humidifi ers and by a low water fl oat switch for humidifi ers with the RO/DI
water option (see Figure 3-1).
These water level monitors tie into the Vapor-logic controller. If the water level drops below a
safe point, the controller turns the burners off and tries to fi ll the tank. If unable to fi ll the tank
within a defi ned time period, an “Excessive refi ll time” alarm appears in the Vapor-logic Alarm
Log. The burners remain off until this alarm is cleared.
• In tap/softened water applications, the water level in the tank is also monitored by a redundant
low-water system that operates independently of the Vapor-logic controller. This system is tied
directly into the power source for the gas valves. If this system detects a low water condition,
the humidifi er shuts down until water is present. A “GTS low water alarm” will be active while
the condition exists.
• There is a temperature sensor near the top of the heat exchanger. If the water level drops too
low and both the main and redundant low water sensors fail to detect it, the temperature sensor
shuts down the humidifi er to prevent an unsafe condition.
• There is a limit-control thermal trip next to the temperature sensor. This thermal trip operates
independently from the Vapor-logic controller. If the water level drops below the heat
exchanger, the thermal trip will directly shut down the gas valves. The thermal trip has a red
button that must be manually reset before the burners are able to fi re again.
Safeguards