THERMOLEC THERMO-N-AIR Duct Heater Instruction Manual

: June 12, 2024
: THERMOLEC

Table of Contents

Mechanical Installation.
Electrical Installation
Documents / Resources

Installation instructions for THERMO-N-AIR THERMOLEC THERMO N
AIR Duct Heater

Please read instructions carefully before installation.

Mechanical Installation.

– The direction of airflow is reversable by simply rotating the unit 180° in the horizontal position only.
This is possible due to the automatic cutouts on the top and bottom of the unit.
– Do not install elbows closer than 8 inches to the inlet or the outlet of the unit.
– Use 6” round insulated duct for the inlet connection and uninsulated for the outlet. Minimize the use of elbows.
– The electronic controller ajust the heating capacity to the volume of air and shuts down the heater when there is no air flow. The minimum amount of air required (in cubic feet per minute) to operate the unit is given in the last column of the table on side 2 (CFM).
– Attach the unit to a suitable support. This model is small enough to be located between standard 16” spaced floor joists. Always allow a minimum 1/2” clearance above the heater. To simplify installation, attach the mounting bracket and then hook the top of the unit on the bracket and only screw in the bottom flange.

Electrical Installation

NOTE: When the Room Control AND a current sensor are connected to the D22-TFS, the current sensor will take priority in switching on the unit.

– Please conform to all local and national electrical codes for wiring. The system should be supplied by a separate cable, of appropriate gauge, and with appropriate protection. Please refer to the following table.
Mini Fresh Air Make-up

Recommended wire gauge and protection
Models*| Collar| Wire| Air Flow
THERMO-N-AIR| Dia•| KW| Volts| Amps.| Gauge| Fuses| CFM
NER-6-1.5-120| 6| 1.5| 120/1| 12.5| 12| 15| 45
NER-6-1.5-240| 6| 1.5| 240/1 with neutr| 6.25| 12| 15| 45
NER-6-2.0-240| 6| 2.0| 240/1 with neutr| 8.3| 12| 15| 60
NER-6-3.0-240| 6| 3.0| 240/1 with neutr| 12.5| 12| 15| 90

other capacity/voltage models available upon request| To convert the air flow to liters/sec., multiply the value in CFM by 0.47.
2. Install the one touch room control in an appropriate location on the wall according to the user’s choice. 3. After installing and wiring the system, use the potentiometer to adjust the desired temperature and the external fan speed control to adjust the air volume. 4. Aconnection to drive simultaneously a 120VAC max. 3 amps. exhaust fan is supplied to be used if required.

Remember: For technical assistance, please use our free help line: 1-800-336-9130

Automatic Reset Thermal Cut-outs (on top and bottom)
Safety feature preventing overheating; will reset automatically after cool- off.
Washable Filter
Easy access filter.
Enclosure
Corrosion resistant galvanized steel.
Air Flow Sensor
Modulates the heating capacity according to the quantity of air flowing through the heater.
Manual Reset Thermal Cut-out
Additional safety feature which prevents the frame from overheating.
Temperature Sensor
Controls the heater proportionally to maintain the pre-set air temperature in the duct.
Open Coil Elements
Made of the highest grade nickel-chrome resistance wire, they will not age or oxidize, thus assuring longer heater life.
Built-in Electronic Temperature Controller and Sensor
Proportionally modulates the heating load to match the exact capacity required, thus minimizing operating cost.
Round Collars
Simplifies the installation and considerably reduces field labor.
Fan Connection
120VAC up to 3 amps. max. output to drive fan
Damper
Automatically opens when the heater is in operation.

THERMOLEC THERMO N AIR Duct Heater - parts

One Touch Room Control
Allows full or intermittent ventilation.
Pilot lights indicate the selected mode.

120V

LEGEND

A	AUTOMATIC RESET CUT-OUT
M	MANUAL RESET CUT-OUT
D22-TFS	ELECTRONIC CONTROLLER
H	HEATING ELEMENT
DS	DUCT SENSOR
S2	AIR FLOW SENSOR
T	TRANSFORMER
SSR	SOLID STATE RELAIS
FR	FAN & EXHAUST FAN RELAY
TA	TEMPURATURE SET POINT ADJUSTER
TFC-2	PUSH BUTTON ROOM CONTROLLER
CT	CURRENT TRANSFORMER

240 V

LEGEND

A	AUTOMATIC RESET CUT-OUT
M	MANUAL RESET CUT-OUT
D22-TFS	ELECTRONIC CONTROLLER
H	HEATING ELEMENT
DS	DUCT SENSOR
S2	AIR FLOW SENSOR
T	TRANSFORMER
SSR	SOLID STATE RELAIS
FR	FAN & EXHAUST FAN RELAY
TA	TEMPURATURE SET POINT ADJUSTER
TFC-2	PUSH BUTTON ROOM CONTROLLER
CT	CURRENT TRANSFORMER

Room Controller Instructions

MINI FRESH AIR MAKE-UP – THERMO-N-AIR
Field of Application:

Fresh Air Make-up for residential houses, condos or apartments.

Scope:

Standard house from 1800 to 2000 square feet.
An airflow of 60 cubic feet per minute (CFM) is required for a minimum of 2.0 KW.

Operating Procedure:

Make sure the fan is adjusted at 60 CFM.
Adjust the output temperature of the THERMO-N-AIR on the D22-TFS module.
Use the push button Room Controller (installed near the entrance door) for either a continuous or intermittent operation, depending upon how many air changes you require.
For a dry contact operation (on-off) please contact Thermolec.

N.B.
For homes with a surface area of more than 2000 square feet, the required airflow is 90 CFM for a minimum of 3.0 KW.
Connect the bathroom fan to the F F terminals in the THERMO-N-AIR.
The operation is exactly the same as the 60 CFM unit.

Push Button Room Controller

The buttons control three functions: Stop, Continuous Ventilation and Intermittent Ventilation. A pilot light confirms the chosen mode.