DURASTAR DRAH1T, Installation Instructions Manual

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3
TABLE OF CONTENTS
(continued)
3.14.1 General Airflow Operating Limits ................................................... . ..... 28
3.14.2 Selecting Indoor Blower Motor Speed ................................................. 28
3.14.2.1 DRAH1T Models (Constant Torque ECM Motor) .......... ................ .. 28
3.14.3 Airflow Performance Data .................................................................... 29
3.14.3.1 DRAH1T (Constant Torque Motor) - 115/208/240/480V ................. 29
4.0 START-UP ....................................................................................................... 33
4.1 Pre-Start Checklist ....................................................................................... 33
4.2 System Start-Up and Operational Check-Out .............................................. 33
4.3 Sequence of Operation ................................................................................ 33
4.3.1 Cooling Mode ........................................................................................ 33
4.3.2 Electrical Heat Mode ............................................................................. 34
4.3.3 Heat Pump Heating Mode ..................................................................... 34
4.3.4 Supplemental Electric Heat During Defrost ...........................................
34
4.3.5 Emergency Heat (Heat Pump) .............................................................. 34
4.3.6 Thermostat Fan Setting ......................................................................... 34
4.4 Correcting Electric Heat kW for Voltage .......................................................
35
4.5 Calculating Electric Heat Capacity in BTUH ................................................ 35
4.6 Checking Indoor Air-Flow ............................................................................. 35
4.6.1 Estimating CFM Using External Static Pressure ...................................
35
4.6.2 Estimating CFM Using Electric HEat Temperature Rise ....................... 35
4.7 Checking Refrigerant Charge ....................................................................... 36
5.0 COMPONENTS & CONTROLS ...................................................................... 36
5.1 Blower Motor ................................................................................................ 36
5.2 Motor Run Capacitor .................................................................................... 36
5.3 Blower Control ..............................................................................................
37
5.4 Blower .......................................................................................................... 37
5.5 Transformer .................................................................................................. 37
5.6 Indoor Coil Assembly ................................................................................... 37
6.0 ACCESSORIES & KITS .................................................................................. 38
6.1 Electric Resistance Heart Kits ...................................................................... 38
6.2 Jumper Bar Kits ............................................................................................ 38
6.3 Auxiliary Horizontal Overflow Pans ..............................................................
38
6.4 External Filter Bases .................................................................................... 38
6.5 Combustible Floor Bases ............................................................................. 39
6.6 Horizontal Adapter Kits ................................................................................
39
7.0 MAINTENANCE .............................................................................................. 39
7.1 Air Filter ........................................................................................................ 39
7.2 Indoor Coil, Drain Pan, Drain Line ...............................................................
40
7.3 Blower Motor and Wheel .............................................................................. 40
7.4 Motor Lubrication ......................................................................................... 40
7.5 Blower Assembly Removal & Replacement .................................................
40
7.6 Motor Replacement ...................................................................................... 41
7.7 Blower Wheel Replacement ......................................................................... 41
7.8 Replacement Parts ....................................................................................... 41
8.0 DIAGNOSTICS ................................................................................................ 42
9.0 WIRING DIAGRAMS ....................................................................................... 43
9.1 DRAH1T - 208-240V ..................................................................... 43