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.
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 […]
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 […]
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 […]
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 […]
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 […]
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. It is forbidden to bypass the PDS if it appears to be malfunctioning during operation. A chattering PDS means there are air […]
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 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 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 […]