DURASTAR DRAH1T - Page 3

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 Airow 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 Overow 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