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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
• 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
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 CalculationThis can be done on a preprinted curve sheet* or
done on graph paper
* Pub 34-4024-1
Btu/h Heat Loss5K increments
80-
70-
60-
50-
40-
30-
20-
10-0
65504030201001020 60
3.5
3
2.5 unit size
2
1.5
Outdoor Temperature
Plotting Heat Loss CalculationStep 1. mark calculated loss and design temperature
Btu/h Heat Loss5K increments
80-
70-
60-
50-
40-
30-
20-
10-0
65504030201001020 60
3.5
3
2.5 unit size
2
1.5
Example: 15of design, 47MBtu/h Loss
Outdoor Temperature
Plotting Heat Loss CalculationStep 2. Draw line from design point to 65of
Btu/h Heat Loss5K increments
80-
70-
60-
50-
40-
30-
20-
10-0
65504030201001020 60
3.5
3
2.5 unit size
2
1.5
Example: 15of design, 47MBtu/h Loss, Cooling load 26.8MBtu
Outdoor Temperature
OPTIONS
• Bonnet T’stat– If supply air temperatures 150of or >
• Unrestricted ModeIndoor Thermostat fully controls operation
• Restricted ModeOutdoor thermostat limits 2nd stage
Indoor Thermostat
(Electro-mechanicalT’stat only.)Anticipator circuit
Switch Over Valve output(for cooling)
24 Volts hot
Second Stage, Heating output First Stage, Heat or Cool output
24 Volts common
Emergency heat output
Y B GW R O T X2
Fan ON output
Indoor ThermostatUse Heat Pump Thermostat
– Electro-mechanical – Programmable
Relative Line Sizesin following drawings
Inactive lines
Field wiring
Factory wiring
Active lines
Field wiring
Factory wiring
Bonnet Thermostat Option Y B GW T X2
Y2
Y1 B W1
G1
W3 Y3 X3 G3
X2
T
X2
Y
R
B
BR
O
K1-2
R
K1-3
K1-1
K1 TDR
TDR-1
O
Heat PumpOD section
OR
BR/X2 or BK
YL
RD
BL
B
G
W1
W2
Y
R
FURNACE
*
* Two stage furnace w/ 2 stage control
BT**
**Required if Furnace supply air is >150of. Limits air temperature over indoor coil.
BT = THT1248
UN-RESTRICTED MODESTAND BY
Y B GW T X2
Y2
Y1 B W1
G1
W3 Y3 X3 G3
X2 B
G
W1
W2
Y
R
FURNACE
T
X2
Y
R
B
BR
O
K1-2
R
K1-3
K1-1
K1 TDR
TDR-1
TAYPLUS103A
Room T’statO
Heat PumpOD section
OR
BR/X2 or BK
YL
RD
BL
*
* Two stage furnace w/ 2 stage control
UN-RESTRICTED MODECall for Cooling
Y B GW R O T X2
Y2
Y1 B W1
G1
W3 Y3 X3 G3
X2 B
G
W1
W2
Y
R
FURNACE
T
X2
Y
R
B
BR
O
K1-2
K1-3
K1-1
K1 TDR
TDR-1
Heat PumpOD section
OR
BR/X2 or BK
YL
RD
BL
UN-RESTRICTED MODECall for 1st Stage Heat
Y B GW R O T X2
Y2
Y1 B W1
G1
W3 Y3 X3 G3
X2 B
G
W1
W2
Y
R
FURNACE
T
X2
Y
R
B
BR
O
K1-2
K1-3
K1-1
K1 TDR
TDR-1
Heat PumpOD section
OR
BR/X2 or BK
YL
RD
BL
UN-RESTRICTED MODEDefrost / 1st Stage Heat
Y B GW R O T X2
Y2
Y1 B W1
G1
W3 Y3 X3 G3
X2 B
G
W1
W2
Y
R
FURNACE
T
X2
Y
R
B
BR
O
K1-2
K1-3
K1-1
K1 TDR
TDR-1
Heat PumpOD section
OR
BR/X2 or BK
YL
RD
BL
UN-RESTRICTED MODECall for 2nd Stage Heat
Y B GW R O T X2
Y2
Y1 B W1
G1
W3 Y3 X3 G3
X2 B
G
W1
W2
Y
R
FURNACE
T
X2
Y
R
B
BR
O
K1-2
K1-3
K1-1
K1 TDR
TDR-1
Heat PumpOD section
OR
BR/X2 or BK
YL
RD
BL
*
*American Standard Furnace, furnace control operates fan. If furnaces needs “G” for fan, place jumper G3 to G1 (Note 5)
UN-RESTRICTED MODESwitched to Emerg. Heat, Call for 1st Stage Heat
Y B GW R O T X2
Y2
Y1 B W1
G1
W3 Y3 X3 G3
X2 B
G
W1
W2
Y
R
FURNACE
T
X2
Y
R
B
BR
O
K1-2
K1-3
K1-1
K1 TDR
TDR-1
Heat PumpOD section
OR
BR/X2 or BK
YL
RD
BL
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 ModePrevious Schematic
Y B GW T X2
Y2
Y1 B W1
G1
W3 Y3 X3 G3
X2 B
G
W1
W2
Y
R
FURNACE
T
X2
Y
R
B
BR
O
K1-2
R
K1-3
K1-1
K1 TDR
TDR-1
O
Heat PumpOD section
OR
BR/X2 or BK
YL
RD
BL
*
* Two stage furnace w/ 2 stage control
2
13
ODT Added **
**TAYTSAT250A
Restricted ModeCurrent Schematic
Y B GW T X2
Y2
Y1 B W1
G1
W3 Y3 X3 G3
X2 B
G
W1
W2
Y
R
T
X2
Y
R
B
BR
O
K1-2
R
K1-3
K1-1
K1 TDR
TDR-1
O
OR
BR/X2 or BK
YL
RD
BL
2
13
3
1
2
6
5
4
Heat PumpOD section
Relay RequirmentAdded **
**RLY0975 + TAYTSAT250A
*
* Two stage furnace w/ 2 stage control
Current Restricted ModeCall for Cooling
Y B GW T X2
Y2
Y1 B W1
G1
W3 Y3 X3 G3
X2 B
G
W1
W2
Y
R
T
X2
Y
R
B
BR
O
K1-2
R
K1-3
K1-1
K1 TDR
TDR-1
O
OR
BR/X2 or BK
YL
RD
BL
2
13
3
1
2
6
5
4
Heat PumpOD section
Current Restricted Mode1st Stage Heat
Y B GW T X2
Y2
Y1 B W1
G1
W3 Y3 X3 G3
X2 B
G
W1
W2
Y
R
T
X2
Y
R
B
BR
O
K1-2
R
K1-3
K1-1
K1 TDR
TDR-1
O
OR
BR/X2 or BK
YL
RD
BL
2
13
3
1
2
6
5
4
Heat PumpOD section
Current Restricted ModeDefrost /1st Stage Heat
Y B GW T X2
Y2
Y1 B W1
G1
W3 Y3 X3 G3
X2 B
G
W1
W2
Y
R
T
X2
Y
R
B
BR
O
K1-2
R
K1-3
K1-1
K1 TDR
TDR-1
O
OR
BR/X2 or BK
YL
RD
BL
2
13
3
1
2
6
5
4
Heat PumpOD section
Current Restricted Mode2nd Stage Heat
Y B GW T X2
Y2
Y1 B W1
G1
W3 Y3 X3 G3
X2 B
G
W1
W2
Y
R
T
X2
Y
R
B
BR
O
K1-2
R
K1-3
K1-1
K1 TDR
TDR-1
O
OR
BR/X2 or BK
YL
RD
BL
2
13
3
1
2
6
5
4
Heat PumpOD section
Current Restricted ModeEmergency Heat
Y B GW T X2
Y2
Y1 B W1
G1
W3 Y3 X3 G3
X2 B
G
W1
W2
Y
R
T
X2
Y
R
B
BR
O
K1-2
R
K1-3
K1-1
K1 TDR
TDR-1
O
OR
BR/X2 or BK
YL
RD
BL
2
13
3
1
2
6
5
4
Heat PumpOD section
Current Restricted ModeFurnace locked out above ODT Setpoint**
Do not attach wire at W or ODT term 1
Y2
Y1 B W1
G1
W3 Y3 X3 G3
X2 B
G
W1
W2
Y
R
T
X2
Y
R
B
BR
O
K1-2
K1-3
K1-1
K1 TDR
TDR-1
Y B GW T X2 RO
OR
BR/X2 or BK
YL
RD
BL
*
* Two stage furnace w/ 2 stage control
2
13
3
1
2
6
5
4
Heat PumpOD section
**Note 8 of instructions
Furnace locked out above ODT Setpoint**Outdoor temp drops below ODT Setpoint
Y2
Y1 B W1
G1
W3 Y3 X3 G3
X2 B
G
W1
W2
Y
R
T
X2
Y
R
B
BR
O
K1-2
K1-3
K1-1
K1 TDR
TDR-1
OR
BR/X2 or BK
YL
RD
BL
*
* Two stage furnace w/ 2 stage control
2
13
3
1
2
6
5
4
Heat PumpOD section
**Note 8 of instructions
Y B GW T X2 RO
