Lennox International Inc. 67M41 User's Manual
Contents
1. LENNOX 2003 Lennox Industries Inc Dallas Texas USA 504 797M 05 03 HEAT PUMP ACCESSORIES Technical Publications Litho U S A HEAT PUMP CONTROL T STAT DF TEMPER KIT INSTALLATION INSTRUCTIONS FOR T STAT DF TEMPER KIT 67M41 FOR USE WITH LENNOX DUAL FUEL BALANCE POINT CAPABLE THERMOSTATS Shipping amp Packing List Package 1 of 1 contains the following 1 DT1 Discharge thermostat probe 1 Bag assembly containing 2 wire nuts 4 8 18 x 1 2 screws Field provided supplies Thermostat wire Application The DT1 defrost discharge thermostat is designed to be used with Lennox thermostats that have dual fuel capa bilities and setable balance points The thermostat al lows for the furnace to cycle on and off during a defrost in order to temper the discharge air and it protects the compressor from high refrigeration pressures during de Installation gt a gt Installing the DT1 Discharge Thermostat Probe The DT1 discharge thermostat probe must be installed between the indoor coil and the furnace 1 Find a location to install the probe that is on the the coil endplate Ensure that the probe will clear all plumbing 2 Remove the endplate from coil and cut a hole approximately 2 in diameter to allow for the DT1 3 With airflow arrow pointing in the appropriate posi tion use the four provided screws to secure the probe to the endplate 4 Replace the endplate to the coil 5 U2. sing field provided thermostat wire connect the DT1 S89 to the W1 terminal of the defrost board and W1 terminal of the furnace See figure 2 05 03 CAAA AT Page 1 DT1 Discharge Temperature Probe Installation Location evaporator coil DT1 discharge thermostat DT1 must be installed between the furnace and the evaporator coil with airflow arrow in correct position Upflow application shown Figure 1 DT1 Discharge Temperature Probe Wiring w1 w1 O O Defrost DT1 S89 Discharge Air Sensor Furnace Board 80 F close 90 F open Locate sensor in the air stream between the furnace and the coil Figure 2 504 797M OANA NIN O OON
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