Lennox T-CLASS TM SEPARATED COMBUSTION UNIT HEATERS - Manuals

Page 4 . Unit Heater Installation 45, 60, and 75 size units may be installed in the normal position or inverted 180° as shown in figure 1 depending on desired location as governed by clearances, vent connection, air direction, gas supply, electrical supply and service accessibility. 1- Rotate louver...

Page 5 A-General Recommendations and Requirements NOTE - The vent is a passageway, vertical or nearly so, used to convey flue gases from an appliance, or its vent connector, to the outside atmosphere. The vent connector is the pipe or duct that connects a fuel-gas burning appliance to a vent or chim...

Page 6 FIGURE 2 VENT AND AIR INTAKE TERMINATION ON SINGLE WALL VENT SINGLE WALL TERMINATION DOUBLE WALL (TYPE B-1) TERMINATION ROOF FLASHING ROOF PITCHED FROM 0" TO 45" 2" CLEARANCE THIMBLE SEAL JOINT BETWEEN SINGLE WALL VENT AND “B" VENT AND THE ANNULAR SPACE OF THE “B" VENT. CL...

Page 7 3- The air inlet diameter shall be 3” (76mm) on 45/60/75 units and 4” (100mm) on 100/125 units. Refer to table 4 for diameter and termination requirements. 4- Select a wall termination point that will maintain ¼” rise per foot slope of horizontal run of vent pipe. The vent may be single wall ...

Page 8 FIGURE 4 CONDENSATE DRAIN THROUGH TEE PIPE AND DRAIN LOOP DRAIN LOOP WITH WATER TRAP (TO CONDENSATE DRAIN) GROUND LEVEL NOTE - MINIMUM HORIZONTAL LENGTH 3 FT. (91.4 CM) NOT INCLUDING TERMINATION. REFER TO TABLE 2 FOR MAXIMUM LENGTH AND NUMBER OF ELBOWS. MAY BE SINGLE WALL (26 GSG) GALV. OR EQ...

Page 9 TABLE 3 VERTICAL VENT REQUIREMENTS FLUE TYPE MODEL INSTALLATION AIR INLET TYPE FLUE DIA. AIR INLET DIA. VENT CAP OTHER SINGLE WALL 45 COMMERCIAL or RESIDENTIAL SINGLE WALL or METAL FLEX VENT 3” 3” U.L. APPROVED MAY USE ONE SECTION OF B-VENT TYPE B VENT 45 COMMERCIAL or RESIDENTIAL SINGLE WALL...

Page 12 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 ven...

Page14 START-UP AND OPERATION Unit Start-Up FOR YOUR SAFETY READ BEFORE LIGHTING Electric shock hazard. Can cause injury or death. Do not use this heater if any part has been under water. Immediately call a qualified service technician to in-spect the furnace and to replace any partof the control sy...

Page 15 Gas Valve Operation for White Rodgers 36E Series Valve (Figure 12) 1- STOP! Read the safety information at the beginning of this section. 2- Set thermostat to lowest setting. 3- Turn off all electrical power to appliance. 4- This appliance is equipped with an ignition device which automatica...

Page 16 To Turn Off Gas To Unit 1- Set thermostat to lowest level. 2- Turn off all electrical power to unit if service is to be performed. 3- Honeywell VR8205 series valve: turn knob on gas valve 90° clockwise to OFF . White Rodgers 36E series valves : turn knob on gas valve 180 ° either way to OFF ...

Page 17 ADJUSTMENTS High Altitude Units may be fired at full input up to 2000 ft. (610m) above sea level. Above 2000 ft. (610m), manifold pressure must be reduced by 4 percent for each 1000 feet above sea level or as specified by local authority having jurisdiction. Adjust pressure regulator to pres...

Page 18 TABLE 7 LP/PROPANE GAS MANIFOLD PRESSURES - in.wg. (kPa ) ALTITUDE FT. (M) MODEL 0-2000 (0-610) 2001-3000 (610-914) 3001-4000 (915-1219) 4001-5000 (1220-1524) 5001-6000 (1524-1829) 6001-7000 (1829-2134) 7001-8000 (2134-2438) 8001-9000 (2439-2743) 9001-10000 (2744-3048) TUA045SL 9.5 (2.37)* 7...

Page 19 SERVICE CAUTION - Turn off gas and electrical power to unit before performing any maintenance or service operations on this unit. Remember to follow lighting instructions when putting unit back into operation after service or maintenance. Burners 1- Periodically examine burner flames for pro...