NOTE: All wiring must comply with local and national electrical code |
| FUNCTIONALITY AND OPERATION |
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requirements. Read and heed all unit caution labels. |
| Jumper Positions |
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NOTE: It is possible to vary the amount of electric heat turned on during |
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| Heat Enable Jumper |
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the defrost cycle of a heat pump. Standard wiring will only bring on the |
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first stage of electric heat during defrost. See Heat Output and Limit |
| The HEAT ENABLE jumper configures the control for heat kit operation. | |||||
Connections and Table 6 for additional information on heat during |
| The jumper must be in the HEAT position if a heat kit is installed with | |||||
defrost cycle. |
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| the air handler. |
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TABLE 2: Low Voltage Connections |
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| With the jumper in the NO HEAT position, the control will not energize | ||||
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| the heat relay outputs or sense the limit switch input. |
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Terminal |
| Signal | Comment |
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R |
| 24 VAC power (fused) |
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| the HEAT position. If the jumper is not present and a heat kit is not | ||||
G |
| Continuous Fan operation |
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| present, the control will sense an open limit condition and the blower | ||||
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| Second or full stage |
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Y/Y2 |
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| will run continuously. |
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| compressor operation |
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| Hum Stat Jumper |
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Y1 |
| First stage compressor | Not used with outdoor units |
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| operation | having one stage compressors. |
| The HUM STAT jumper configures the control to monitor the humidity | |||
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W2 |
| Second stage heat operation |
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| switch input. With the jumper in the NO position, the control will ener- | ||||
W1 |
| First stage heat operation |
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| gize the HUM terminal with 24 VAC continually. With the jumper in the | ||||
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| 24 VAC will be present at this |
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| YES position, the control will monitor the HUM input to control the HUM | |||
O |
| Reversing valve operation | terminal when the MODE |
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| OUT output to control an external humidifier. |
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| jumper is in the AC position. |
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| This is normal. |
| If the jumper is not present, the control will operate as if the jumper is in | ||
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| 24 VAC will be present at this |
| the YES position. |
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HUM |
| Humidity switch input | terminal when the HUM STAT |
| Mode Jumper |
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| jumper is in the NO position. |
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| This is normal. |
| The MODE jumper configures the control to operate properly with an air | ||
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| Connection point for | This terminal is a connection | ||||
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| conditioner (AC position) or heat pump (HP position). With the jumper in | ||||
X/L |
| point only and does not affect |
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| heat pump fault indicator |
| the AC position, the control will energize the O terminal with 24 VAC | ||||
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| air handler control operation. |
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| continually. With the jumper in the HP position, the O input signal is | ||
COM |
| 24 VAC common |
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| received from the room thermostat. |
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The low voltage connections may be connected to the screw terminals |
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| If the jumper is not present, the control will operate as if the jumper is in | ||||||
or the quick connect terminals. The screw terminals and the quick con- |
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| the HP position. |
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nect terminals are physically connected on the control board. |
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| SPARE Jumper |
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HUMIDITY SWITCH INPUT |
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| The control includes a spare jumper that can be used if a jumper is lost. | |||||
The air handler control is designed to work with a humidity control that |
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| The SPARE jumper does not have any effect on the operation of the | ||||||
closes when the humidity is below the |
| control. |
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when the humidity is above the |
| Status and Fault Codes |
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referred to as a humidistat or a dehumidistat. |
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| The control includes an LED that displays status and fault codes. These | ||||||
The humidity switch controls both humidification and |
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| codes are shown in Table 3. The control will display the fault codes until | ||||||
operation of the control. The control provides humidification using the |
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| power is removed from the control or the fault condition is no longer | ||||||
HUM OUT relay output and |
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| present. |
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speed. This is accomplished using the LOW FAN output and a field |
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installed |
| TABLE 3: Fault Codes |
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humidity switch should be connected to the R and HUM terminals of the |
| Fault or Status Condition |
| LED1 (RED) | |||
control. See Figures 10 & 11. |
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| Flash Code | |||
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SECTION VI: REQUIRED CONTROL |
| Status |
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| No power to control |
| OFF | ||||
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| Normal operation |
| 2s ON / 2s OFF | ||
IMPORTANT: The following steps must be taken at the time of installa- |
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| Control in test mode |
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tion to insure proper system operation. |
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| Control failure |
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1. Consult system wiring diagram to determine proper thermostat |
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| Limit Faults |
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wiring for your system. |
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| Limit switch currently open (not in lockout) |
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2. If heat kit is installed, change HEAT ENABLE jumper from NO |
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| Multiple limit openings with no call for heat |
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HEAT to HEAT position. |
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3. If a humidstat is installed, change HUM STAT jumper from NO to |
| Multiple limit openings during one call for heat |
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| Single long duration limit opening |
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YES. |
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4. Set the MODE jumper to A/C (Air Conditioner) or HP (Heat Pump) |
| Multiple long duration limit openings |
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position depending on the outdoor unit included with the system. |
| Fan failure |
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| Wiring Related Faults |
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| Simultaneous call for heating and cooling |
| 7 |
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| Internal Control Faults |
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| Control recovered from internal event |
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6 | Unitary Products Group |