Lennox International Inc TUA45S, TUA125S, TUA60S Electrical Connections, Line Voltage Field Wiring

6- After it has been determined that each appliance remaining connected to the common venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas-burning appliance to their previous condition of use.

7- If improper venting is observed during any of the above tests, the common venting system must be corrected. The common venting system should be resized to approach the minimum size as determined by using the appropriate tables in Appendix G in the current standards of the National Fuel Gas Code, ANSI Z223-1 in the U.S.A. and the appropriate Category I Natural Gas and Propane appliances venting sizing tables in the current standards of the CSA-B149.1 and .2 in the Natural Gas and Propane Installation Code in Canada.

NOTE - Local codes may supersede any of the above provisions.

Electrical Connections

NOTE - These unit heaters use a direct spark ignition system. There is no pilot necessary as the spark lights the main burner as the gas valve is turned on. The direct spark ignition control board emits radio noise as the sparking process is underway. The level of energy may be sufficient to disturb a logic circuit in a microprocessor controlled thermostat. It is recommended that an isolation relay be used when connecting the unit heaters to a microprocessor controlled thermostat. Install the thermostat according to instructions provided. Select circuit protection and wire size according to the unit rating plate. Install a separate disconnect switch (protected by either fuse or circuit breaker) near the unit so that power can be turned off for servicing. Connect wiring through knockout on the junction box located on the side of the unit heater. Refer to heater wiring diagram for connection information. Use 18 gauge wire or larger for thermostat connections.

Electrically ground unit in accordance with local codes or, in the absence of local codes, in accordance with the current National Electrical Code (ANSI/NFPA No. 70) in the U.S.A., and in Canada with the current Canadian Electrical Code, Part 1 (CSA C22.1).

Make line voltage connections as shown in figure 8. Connect field wiring as shown on wiring diagram on unit. Also refer to typical diagram in this manual. An additional thermostat wire must be run to terminal “G" on heater when continuous blower is desired.

	LINE VOLTAGE FIELD WIRING
	UNIT ELECTRICAL BOX
L1	BLACK
N	WHITE
	FIGURE 8

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