How Does It Work - Honeywell TrueSTEAM Series Reference Manual

What happens if done wrong?
• The most common mistake in Power Monitoring is incorrect positioning of the DIP-4 switch. If you leave DIP-4 in its default position (down),
truesteaM will look for power at its R and C terminals. If this R/C wire connection is not present, and dIP-4 is down, then truesteaM's fault
notification 'Call service' light will activate and humidity output will not start.
• If DIP-4 is up, TrueSTEAM will not look for power at the R and C terminal, even if it is wired up. It is critical for the contractor to understand
that if dIP-4 is up, truesteaM itself is ignoring Power and airflow Monitoring. therefore, an alternative source must be installed. such as a
thermostat that receives R and C power from the system transformer, and controls humidification.
How do I troubleshoot the Power Monitoring?
• Unplug the TrueSTEAM line cord, and remove the TrueSTEAM cover.
• Check to see if DIP-4 is UP or dOWn. If dOWn, ensure the truesteaM R and C terminal are wired to the hVaC system R and C terminals.
this is needed to ensure a fault mode doesn't occur.
• If DIP-4 is UP, make sure the humidifier control (thermostat) is powered by the system transformer to ensure the humidifier isn't running
without the system having power.
II. Air Proving - System Fan Activation
What is it?
a centrally ducted humidifier like truesteaM requires air movement via the hVaC system fan to push humidity into the living space. the
system fan is controlled through its G-terminal. truesteaM can be wired to monitor when the system G terminal is energized – indicating there
is air flow in the duct. If airflow is not present and humidity is demanded by the control, truesteaM can be configured to energize the hVaC
system G when humidity is needed.

How does it work?

Fan activation can be done in two ways – through the truesteaM or through a thermostat that has built-in humidifier control, such as
VisionPRO IaQ or Prestige
TrueSTEAM Fan Enforcement
• Break the G connection between the thermostat G and the HVAC system G
— thermostat G goes to truesteaM Gt terminal.
— hVaC system G goes to truesteaM Gf terminal.
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