(Heat Pump Heating with Fossil Fuel supplemental Heat) TAYPLUS103A For Furnace With Add-on Heat Pump (Heat Pump Heating with Fossil Fuel supplemental Heat)

Objectives Understand application of heat pump with furnace. Understand wiring and operation of TAYPLUS103A accessory with furnace and heat pump. Become familiar with trouble shooting procedures in this application.

WHY DUAL FUEL? Best of both worlds Heat Pump Gas Furnace High Efficiency above balance point. High Capacity above balance point. Gas Furnace Longer operating cycles at lower outdoor temp.. Fewer start ups = less stack loss Fewer start ups = better comfort level Economy at lower outdoor temperatures

Size heat pump to Cooling Load. Equipment Selection Heat Gain / Heat Loss Calculation must be done for any heat pump application. Even more important for “dual fuel” application. Size heat pump to Cooling Load. Industry guidelines allow 1.25 multiplier. Size furnace (output) to calculated heat loss. Furnace blower capacity must equal or exceed heat pump airflow requirement.

Plotting Heat Loss Calculation After calculating the heat loss of the structure plotting the heat loss allows you to determine several things. Operating balance point or switch over point heat loss at various outdoor temperatures approximate heating capacity at various outdoor temperatures

Plotting Heat Loss Calculation This can be done on a preprinted curve sheet* or done on graph paper Btu/h Heat Loss 5K increments 80 - 70 60 50 40 30 20 10 65 3.5 3 2.5 unit size 2 1.5 Outdoor Temperature * Pub 34-4024-1

Plotting Heat Loss Calculation Step 1 Plotting Heat Loss Calculation Step 1. mark calculated loss and design temperature Example: 15of design, 47MBtu/h Loss Btu/h Heat Loss 5K increments 80 - 70 60 50 40 30 20 10 65 3.5 3 2.5 unit size 2 1.5 Outdoor Temperature

Plotting Heat Loss Calculation Step 2 Plotting Heat Loss Calculation Step 2. Draw line from design point to 65of Example: 15of design, 47MBtu/h Loss, Cooling load 26.8MBtu 80 - 70 60 50 40 30 20 10 Btu/h Heat Loss 5K increments 3.5 3 2.5 unit size 2 1.5 20 10 10 20 30 40 50 60 65 Outdoor Temperature

OPTIONS Bonnet T’stat Unrestricted Mode Restricted Mode If supply air temperatures 150of or > Unrestricted Mode Indoor Thermostat fully controls operation Restricted Mode Outdoor thermostat limits 2nd stage

Indoor Thermostat Y B G W R O T X2 (Electro-mechanical T’stat only.) Anticipator circuit Fan ON output Switch Over Valve output (for cooling) Emergency heat output 24 Volts hot 24 Volts common Second Stage, Heating output First Stage, Heat or Cool output

Indoor Thermostat Use Heat Pump Thermostat Electro-mechanical Programmable

Relative Line Sizes in following drawings Inactive lines Field wiring Factory wiring Active lines Field wiring Factory wiring

Bonnet Thermostat Option W Y B X2 G W3 Y3 X3 G3 K1-3 FURNACE Heat Pump OD section G1 K1 K1-2 ** TDR G BT BR T W1 * TDR-1 Y2 W2 OR O R BR/X2 or BK X2 K1-1 B X2 Y YL Y Y1 B W1 RD R BL B * Two stage furnace w/ 2 stage control **Required if Furnace supply air is >150of. Limits air temperature over indoor coil. BT = THT1248

UN-RESTRICTED MODE STAND BY G W T X2 Y2 Y1 W1 G1 W3 Y3 X3 G3 W2 R FURNACE BR O K1-2 K1-3 K1-1 K1 TDR TDR-1 TAYPLUS103A Room T’stat Heat Pump OD section OR BR/X2 or BK YL RD BL * * Two stage furnace w/ 2 stage control

UN-RESTRICTED MODE Call for Cooling Y B G W R O T X2 W3 Y3 X3 G3 K1-3 FURNACE G1 K1-2 Heat Pump OD section K1 TDR G W1 BR T TDR-1 W2 Y2 OR O R K1-1 BR/X2 or BK X2 B X2 Y YL Y Y1 B W1 RD R BL B

UN-RESTRICTED MODE Call for 1st Stage Heat Y B G W R O T X2 W3 Y3 X3 G3 K1-3 FURNACE G1 K1-2 Heat Pump OD section K1 TDR G W1 BR T TDR-1 W2 Y2 OR O R K1-1 BR/X2 or BK X2 B X2 Y YL Y Y1 B W1 RD R BL B

UN-RESTRICTED MODE Defrost / 1st Stage Heat Y B G W R O T X2 W3 Y3 X3 G3 K1-3 FURNACE G1 K1-2 Heat Pump OD section K1 TDR G W1 BR T TDR-1 W2 Y2 OR O R K1-1 BR/X2 or BK X2 B X2 Y YL Y Y1 B W1 RD R BL B

UN-RESTRICTED MODE Call for 2nd Stage Heat Y B G W R O T X2 W3 Y3 X3 G3 K1-3 FURNACE G1 * K1-2 Heat Pump OD section K1 TDR G BR T W1 TDR-1 W2 Y2 OR O R K1-1 X2 B BR/X2 or BK X2 Y YL Y Y1 B W1 RD R BL B *American Standard Furnace, furnace control operates fan. If furnaces needs “G” for fan, place jumper G3 to G1 (Note 5)

UN-RESTRICTED MODE Switched to Emerg. Heat, Call for 1st Stage Heat Y B G W R O T X2 W3 Y3 X3 G3 K1-3 FURNACE G1 K1-2 Heat Pump OD section K1 TDR G W1 BR T TDR-1 W2 Y2 OR O R K1-1 BR/X2 or BK X2 B X2 Y YL Y Y1 B W1 RD R BL B

Questions ?

RESTRICTED MODE “Why would I want to restrict it ?” Forces Heat Pump to run to preset outdoor temp. Balance point or Economic balance point Can be overridden by selecting Emergency Heat.

Restricted Mode Previous Schematic W Y B X2 G W3 Y3 X3 G3 ODT Added ** K1-3 FURNACE K1-2 G1 Heat Pump OD section K1 TDR G T W1 BR * TDR-1 W2 Y2 OR O R K1-1 BR/X2 or BK X2 B X2 Y YL Y Y1 B W1 1 3 RD R 2 BL B * Two stage furnace w/ 2 stage control **TAYTSAT250A

Restricted Mode Current Schematic W Y B X2 G Relay Requirment Added ** W3 Y3 X3 G3 K1-3 Heat Pump OD section K1-2 G1 K1 TDR OR G 3 W1 BR T * 2 TDR-1 W2 Y2 1 O R 6 K1-1 B 5 BR/X2 or BK X2 X2 Y 4 YL Y Y1 B W1 1 3 RD R 2 BL B **RLY0975 + TAYTSAT250A * Two stage furnace w/ 2 stage control

Current Restricted Mode Call for Cooling W Y B X2 G W3 Y3 X3 G3 K1-3 Heat Pump OD section K1-2 G1 K1 TDR OR G 3 W1 BR T 2 TDR-1 W2 Y2 1 O R 6 K1-1 5 BR/X2 or BK X2 B X2 Y 4 YL Y Y1 B W1 1 3 RD R 2 BL B

Current Restricted Mode 1st Stage Heat W Y B X2 G W3 Y3 X3 G3 K1-3 Heat Pump OD section K1-2 G1 K1 TDR OR G 3 W1 BR T 2 TDR-1 W2 Y2 1 O R 6 K1-1 5 BR/X2 or BK X2 B X2 Y 4 YL Y Y1 B W1 1 3 RD R 2 BL B

Current Restricted Mode Defrost /1st Stage Heat W Y B X2 G W3 Y3 X3 G3 K1-3 Heat Pump OD section K1-2 G1 K1 TDR OR G 3 W1 BR T 2 TDR-1 W2 Y2 1 O R 6 K1-1 5 BR/X2 or BK X2 B X2 Y 4 YL Y Y1 B W1 1 3 RD R 2 BL B

Current Restricted Mode 2nd Stage Heat W Y B X2 G W3 Y3 X3 G3 K1-3 Heat Pump OD section K1-2 G1 K1 TDR OR G 3 W1 BR T 2 TDR-1 W2 Y2 1 O R 6 K1-1 5 BR/X2 or BK X2 B X2 Y 4 YL Y Y1 B W1 1 3 RD R 2 BL B

Current Restricted Mode Emergency Heat W Y B X2 G W3 Y3 X3 G3 K1-3 Heat Pump OD section K1-2 G1 K1 TDR OR G 3 W1 BR T 2 TDR-1 W2 Y2 1 O R 6 K1-1 5 BR/X2 or BK X2 B X2 Y 4 YL Y Y1 B W1 1 3 RD R 2 BL B

Current Restricted Mode Furnace locked out above ODT Setpoint Current Restricted Mode Furnace locked out above ODT Setpoint** Do not attach wire at W or ODT term 1 Y B G W T X2 R O W3 Y3 X3 G3 K1-3 Heat Pump OD section K1-2 G1 K1 TDR OR G 3 BR T W1 * 2 TDR-1 W2 Y2 1 O R 6 K1-1 B 5 BR/X2 or BK X2 X2 Y 4 YL Y Y1 B W1 1 3 RD R 2 BL B **Note 8 of instructions * Two stage furnace w/ 2 stage control

**Note 8 of instructions Furnace locked out above ODT Setpoint** Outdoor temp drops below ODT Setpoint Y B G W T X2 R O W3 Y3 X3 G3 K1-3 Heat Pump OD section K1-2 G1 K1 TDR OR G 3 BR T W1 * 2 TDR-1 W2 Y2 1 O R 6 K1-1 B 5 BR/X2 or BK X2 X2 Y 4 YL Y Y1 B W1 1 3 RD R 2 BL B **Note 8 of instructions * Two stage furnace w/ 2 stage control