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Commonly Asked Wiring Questions
TrueSTEAM Humidification System
I. Power Monitoring
II. Air Proving-system Fan Activation
III. Optional Add-on Air Proving
I. Power Monitoring
What is it?
Contractors must configure TrueSTEAM to run only when the HVAC system has power
present. By monitoring power, at R and C TrueSTEAM will not produce humidity without
air moving in the duct. When no power is present, there is no airflow.
How does it works?
Power monitoring is done with one of two methods.
Method 1
TrueSTEAM Power Monitoring
• Wire TrueSTEAM R and C to HVAC system R and C
• On the TrueSTEAM circuit board, there are six DIP switches. The 4th DIP from the left
(DIP-4) is used to enable TrueSTEAM power monitoring.
> Setting DIP-4 down enables TrueSTEAM to monitor power at R and C before allowing humidity into the ductwork.
> Setting DIP-4 up disables TrueSTEAM power monitoring through its R and C terminals. Monitoring in this situation is done through
(an alternative source) such as a thermostat with humidifier control that is powered via the HVAC system transformer. NOTE:
TrueSTEAM still requires a humidity control.
Method 2
Power monitoring from thermostat
• The thermostat must be able to operate the system fan and a humidier, and be powered from the HVAC system transformer.
• In the control’s software set-up, select the option that allows humidication only when the system’s fan or heat is active. In VisionPRO IAQ,
this is setup function 0374, and the contractor can select option 0 or 2 to monitor power for humidity operation.
• On the TrueSTEAM circuit board, set DIP-4 to up to disable power monitoring by the humidier, since it is being monitored by
the thermostat.
When should I use one over the other?
• TrueSTEAM power monitoring is ideal when using a humidity control separate from the thermostat, such as TrueIAQ or a mechanical
humidistat (H8908). It is important to note that ‘humidity on demand’ is still possible with power monitoring enforced. If using a humidistat that
has the capability to activate the system fan when humidity is needed. See the next section on ‘System Fan Monitoring and Activation’ for
more details.
• Power monitoring from a thermostat with built-in humidication control is ideal for simplifying the wiring between the humidier and HVAC
system. If the thermostat receives R and C power from the HVAC system, and controls humidity, you only need to connect two wires between
the TrueSTEAM and the system board. For VisionPRO IAQ, connect the two HUM terminals on TrueSTEAM to the HUM terminals on the
Equipment Interface Module.
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