THERMOSTAT | AIR HANDLER |
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SEE |
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NOTE |
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| W |
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| HEAT‐ONLY APPLICATION |
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| AIR |
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| CONDITIONER | THERMOSTAT |
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| HEAT PUMP |
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| UNIT |
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| AIR HANDLER | UNIT |
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| COOLING‐ONLY APPLICATION |
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| THERMOSTAT | AIR HANDLER |
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| CONNECT COMMON |
| BU |
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| WIRE ONLY IF |
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| REQUIRED |
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| W | (REFER TO THE |
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| APPROPRIATE |
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| THERMOSTAT |
| BK |
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| BK | INSTALLATION |
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| INSTRUCTIONS) |
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SEE |
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Y |
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NOTE |
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| AIR CONDITIONER |
| HEAT PUMP APPLICATION WITH |
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| ELECTRIC HEAT |
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| UNIT |
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| COOLING APPLICATION WITH |
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| ELECTRIC HEAT |
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NOTE - Connect common wire only if required (Refer to the appropriate thermostat installation instructions) |
Figure 12. Low Voltage Connections
Airflow — Cooling Blower Speed
The cooling blower speed is factory configured to provide correct airflow for an outdoor unit that matches the cooling capacity rating of the air handler.
If the outdoor unit is smaller than the maximum cooling capacity rating for the air handler, the cooling blower speed may need to be changed. Refer to blower performance chart, table 2 on page 11 .
WARNING
Electric shock hazard! - Disconnect all power supplies before servicing.
Replace all parts and panels before op erating.
Failure to do so can result in death or elec trical shock.
CHANGE BLOWER SPEED
1.Disconnect all power supplies.
2.Remove the air handler access panel.
3.Locate pin number 2 on the blower relay. Two black wires are connected to this terminal pin. One connects to pin number 5 on the blower relay, one connects to an
4.Remove the wire going to the
5.Connect the blower lead [Red (LO), Black (HI)] onto the splice from the
NOTE — Reuse the
6.Replace all panels.
7.Reconnect power.
Page 10