SPECIFICATIONS
Electrical Ratings [@ 77o F (25o C)]: |
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Rated Voltage | 24 VAC |
Rated Voltage Range | |
Max. Power Consumption @ 24 VAC | 4.08 VA |
Nominal Frequency | 50/60 Hz |
Relay Load Ratings: |
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Compressor Contactor Relay | 20 VA in rush, 6 VA holding |
Fan Relay | 1/2 HP @ 240, 1/4 HP @ 120 VAC |
Reversing Valve Relay (RV) | 24 VA |
Auxiliary Heat Relay (D) | 1 Amp. 0.6 P.F. |
Operating Temperature Range | |
Humidity Range | 5% to 95% relative humidity |
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Timing Specifications @ 60Hz*
Nom Units
Defrost Lockout Time | 34 | Mins. |
Maximum Defrost Time | 14 | Mins. |
Transient Delay | 2 | Mins. |
Maximum Frosting Time | 6 | Hrs. |
Short Cycle Lockout Time | 5 | Mins. |
Noise Abatement Time | 5 | Sec. |
*50Hz Timings are 20% longer.
The control is recognized by UL as an incorporated electronics control per UL
OPERATION
Each controller has 24 VAC input and B, Y, and D terminals for connection to a standard thermostat. The controller has pins for connection of two temperature sensors to measure ambient and coil temperature. Controlled outputs are outdoor fan, reversing valve, and compressor contactor.
The controller has a LED to indicate system operation status.
Option Switch
Switch labeled SW1 is used to select the defrost mode termination temperature of outdoor coil. Defrost mode is terminated when the coil temperature exceeds the selected termination temperature. Temperature options for SW1 switch settings are:
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| B | A |
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| On | Off | 50o F |
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| B | A |
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| Off | On | 60o F |
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| B | A |
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| On | On | 70o F (default) |
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| B | A |
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| Off | Off | 80o F |
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| B | A |
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Test Pins
The connector labeled TEST can be used to change operation mode in the field. Momentarily short the test pins to force the system into the defrost mode. Momentarily short the test pins again to terminate the defrost mode. To avoid unnecessary system mode transition, do not use the test pins frequently.
Short Cycle Protection
The control includes protection against short cycling the compressor. At
Noise Abatement
When the reversing valve is switched during an active call for heating or cooling, such as when entering or leaving a defrost cycle, the control will
Diagnostic Features
The control continuously monitors system operation. If a fault occurs, the red LED on the control will flash a diagnostic code, if more than one fault occurs, only the code with the higher priority will flash. The flash time is to be 0.5 seconds on and 0.5 seconds off followed by 2 seconds off. The table shows the diagnostic codes:
LED | Fault Indication | Display Priority | |
ON | Normal | 0 | |
1 | Flash | Defrost mode | 1 |
2 | Flashes | Coil sensor fault | 3 |
3 | Flashes | Ambient sensor fault | 2 |
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