Where is the best place to install the DS-600 sensor when using the CTH-291 as a duct thermostat?
It is recommended that the DS-600 be placed the same dimension as the width of the duct (the heater’s “W” dimension) downstream from the heater for ideal operation.
If the screen on the CTH-291 is completely blank, what does that indicate?
If the screen on the CTH-291 is completely blank upon startup, it most likely means that either there is no power connected to the thermostat, or the thermostat is defective. To function, 24VAC needs to be supplied to terminals R & C in the CTH-291.
What do the symbols “LO” & “HI” mean on the display screen of the CTH-291?
If you see either “LO” or “HI” appear on the display screen, this means that the temperature detected for operation is outside the operating scope of the CTH-291. “LO” means the ambient temperature is below -20°C (-4°F). “HI” means the ambient temperature is above 60°C (140°F).
What does the symbol “- – “mean on the display screen of the CTH-291?
If the screen show “- – “, this means there is a disconnected or broken temperature sensor. This can either be the internal sensor when the CTH-291 is used as a room thermostat, or an external duct sensor connected to terminals 7 & 8 when used as a duct thermostat.
Which setting is dipswitch #2 supposed to be in the CTH-291?
Set the dipswitch #2 in the “RA” position for heating mode. “DA” is only for cooling mode.
Can hot water be used to supply an Acu-Steam?
No, using hot water to supply an Acu-Steam can cause harm to the operation of the unit.
What if, after cleaning an Acu-Steam, error codes “3” and “4” still appear?
Thermolec recommends purchasing and installing the Acu-Steam Maintenance/Tune-Up kit. If the installation is brand new, verify that the unit is properly installed as per the Acu-Steam User Installation Manual. Proper installation is critical to proper operation since the unit operation is dependant on gravity.
How often should the inlet water filter be changed on an Acu-Steam?
Thermolec recommends that the inlet water filter be changed every 6 months to a year.
How often should an Acu-Steam be cleaned?
Thermolec recommends that any Acu-Steam humidifier be cleaned at least twice per season. Refer to the maintenance guide for instructions. See Section 8 – Maintenance in the Acu-Steam Manual.
Can any Humidistat be used to control an Acu-Steam?
No, the humidistat must be a dry contact to enable/disable the humidifier. If the signal to the humidifier is 24VAC, a relay will need to be added to enable/disable the humidifier.