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

2. 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.

3. 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

4. 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.

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

11. Indoor Thermostat Use Heat Pump Thermostat Electro-mechanical
Programmable

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

13. Bonnet Thermostat OptionW 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

14. UN-RESTRICTED MODE STAND BYG 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

15. UN-RESTRICTED MODE Call for CoolingY 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

16. UN-RESTRICTED MODE Call for 1st Stage HeatY 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

17. UN-RESTRICTED MODE Defrost / 1st Stage HeatY 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

18. UN-RESTRICTED MODE Call for 2nd Stage HeatY 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)

19. UN-RESTRICTED MODE Switched to Emerg. Heat, Call for 1st Stage HeatY 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

20. Questions ?

21. 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.

22. Restricted Mode Previous SchematicW 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

23. Restricted Mode Current SchematicW 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
**RLY TAYTSAT250A
* Two stage furnace w/ 2 stage control

24. Current Restricted Mode Call for CoolingW 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

25. Current Restricted Mode 1st Stage HeatW 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

26. Current Restricted Mode Defrost /1st Stage HeatW 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

27. Current Restricted Mode 2nd Stage HeatW 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

28. Current Restricted Mode Emergency HeatW 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

29. 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

30. **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