Frequently Asked Questions

Find swift and convenient answers in our collection of go-to resources for troubleshooting and technical support.

Can any thermostat be used with Thermolec heaters? +

Thermolec can provide thermostats with any given heater upon request. If a different thermostat is to be used, make sure that the output capabilities of the thermostat is compatible with what was ordered; - Active 0-10VDC signal for modulating heaters (Similar to Thermolec’s CTH-291) - Passive Thermistor output for modulating heaters (Similar to Thermolec’s DT-1040 and RT-1030) - Active 24VAC output for staged ON/OFF heaters (Similar to Thermolec’s CTH-010 or CTH-294) - Standard dry-contact thermostats for staged ON/OFF heaters

What is the pressure drop across open and tubular/sheathed elements? +

The pressure drop can be estimated by referring to the Pressure Drop Chart here. (Add Pressure Drop Chart link) These values are under the guideline that the depth of the element frame is 10” (254mm).

What is an electronic air flow sensor? +

The electronic air flow sensor was designed specifically for VAV and CAV applications where the air flow may be too low, even below the recommended air flow. This is to be used in collaboration with modulating controls.

Can any temperature or air flow sensor be used for Thermolec heaters? +

No, only an NTC Type 3 Thermistor with a 10kΩ reading can be used with Thermolec heaters.

What is a PDS? Can the PDS be bypassed? +

The PDS (Pressure Differential Switch) is a safety device used to enable/disable the heater’s operation when sufficient air flow is achieved. It closes when there is a minimum of 0.05” of static pressure. (Add link to PDS spec sheet) It is forbidden to bypass the PDS if it appears to be malfunctioning during operation. A chattering PDS means there are air flow issues in the application that require attention.

Can the 24VAC on the transformer in the Thermolec heater be tapped to supply power to an external source (i.e. thermostat)? +

Yes, this can be achieved on the secondary side of the transformer. The HOT (24VAC) is usually indicated by red wiring, and the Ground (Common) is usually indicated by green wiring. We do not recommend, however, that the pull from the transformer exceed 10VA. This can cause premature failure of the transformer. It is best to inform Thermolec to size the transformer properly if it is known fact the transformer will used to power other sources.

What is FLA, MCA, and MOP/MOCP? +

These are terms to describe amperage values for a heater. FLA stands for “Full-Load Amps”, the maximum nominal current of a heater. MCA stands for “Minimum Circuit Ampacity”, a calculated value with a safety factor that specifies the minimum main power supply and wires. MOP/MOCP stands for “Maximum Overcurrent Protection”, the highest current rating that an electrical equipment's over-current protection devices (such fuses or circuit breakers) are permitted to handle. Note: MOP/MOCP values are not given by Thermolec. This value is to be determined by the installing electrician as per local Electrical Codes.

How does a voltage spike or drop affect the heater? +

A spike or drop in the voltage of an electric heater will vary both the capacity (kW) and amp draw of the heater. Since an electric heater is a resistive load, and the element resistance is a fixed value, an increase in voltage will increase both the capacity and amp draw, and a drop in voltage will do the opposite for both.

Can a different voltage be applied to a heater already designed for a set voltage? +

Although it is not recommended to apply a different voltage to a heater already designed for a set voltage, it can be acceptable to do so if the new voltage being applied is lower than the already-designed voltage. This will just result in a lower capacity and amp draw. It is not acceptable to apply a higher voltage that the already-designed voltage. Doing this will increase the capacity and amp draw of the heater, which can cause damage to the elements and components, and also creates a risk of overheating and potential fires.

What does “SCCR” stand for? +

SCCR is short for “Short-circuit Current Rating”, the maximum current a device or system can safely withstand. This applies to all power components in a control panel. This is a request normally required by a device that must comply with UL508A. Although Thermolec does not comply with UL508A, we can still provide an SCCR rating for heaters.

How is the SCCR rating determined? +

The SCCR rating given for any heater is based on the lowest value of a component in the power circuit. If there are 4 components in the power circuit, the component with the lowest value is what determines the overall SCCR rating of the given heater.

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.

How often should an Acu-Steam unit 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.

How often should the Acu-Steam inlet water filter be changed? +

Thermolec recommends that the inlet water filter be changed every 6 months to a year.

What if, after cleaning the Acu-Steam unit, 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.

Can hot water be used to supply the Acu-Steam unit? +

No, using hot water to supply the unit can actually cause harm to the operation of the unit.

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