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TABLE 2: TEST Input Functionality |
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Duration of | Control Behavior with no system | Control behavior with system |
connection (seconds) | master signals present | master signals present |
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< 2 | No response | No response |
| Display compressor type TS, Ultratech, or | Bypass ASCD (Reduce timer to zero immediately). |
| If Y1 (thermostat or communication) is present and the | |
| single stage compressor, Ignore LPS | |
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| Clear soft lockout | Clear soft lockout |
2 < |
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Clear hard lockout | Clear hard lockout | |
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| Reset TS anticipation mode counter | Reset TS anticipation mode counter |
| to zero for TS systems. | to zero for TS systems. |
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| Reduce TS staging delays for TS |
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| systems as described below. |
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Connection removed | Resume normal LED display |
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Connection not removed | Nothing more than previously explained |
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LED DIAGNOSTIC INDICATORS
The control includes two LED’s that display diagnostic information. LED1 is red and LED2 is green. These LED’s are used to display oper- ational mode, fault information. A third LED, LED3 is used to display status information. LED3 is yellow. These LED’s are used to display operational mode, status, and fault information.
OPERATIONAL MODE DETECTION
The control can be used in a variety of applications including AC units with multistage compressors. The control uses various inputs to deter- mine the proper mode of operation.
The control senses the connections that are made to M, M1, and M2 terminals and determines the correct operational mode for the control. This is done each time power to the control is cycled. Therefore, it is important that no loads be attached to the M1 or M2 terminals of the control for
Do not connect any loads to the M1 or M2 terminals of the control for
OPERATIONAL MODE DISPLAY
The control will display its active operational mode using the onboard LED’s when the TEST pins are connected while no thermostat signals are energized. Table 3 "Operational Mode Display" describes the oper- ational modes. The control will display the operational mode as long as the TEST pins are shorted and no thermostat signals are energized. When the TEST pin short is removed, the control will return to normal LED displays.
TABLE 3: Operational Mode Display
Compressor Type | LED1 (Red) | LED2 (Green) |
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Single Stage Compressor | 1 flash | |
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TS Compressor | 2 flashes | |
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UltraTech Compressor | 3 flashes | |
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STATUS CODE DISPLAY
The control also provides status codes using the LED’s. Status codes indicate the state of the operation of the unit but do not represent a fault. Tables 4 & 5 describes the LED displays during status codes. Sta- tus codes will not be displayed when a fault code is present.
TABLE 4: Status Code Display
Description | Required Condition | LED1 (Red) |
| LED2 (Green) | ||
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No power to control | No power to control | OFF |
| OFF | ||
| TS – M & M1 energized, |
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UltraTech – M energized, | OFF |
| ON | |||
| Single Stage - NA |
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TS and UltraTech – M & M2 energized, | ON |
| ON | |||
Single Stage | Single Stage – M energized |
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Control normal operation – no communication or call for | No faults active, Y1 or Y2 not present | OFF |
| 2s ON / 2s OFF | ||
compressor present |
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Control normal operation – in ASCD period | No faults active, Y1 or Y2 present, | OFF |
| 0.1 sec ON / | ||
ASCD timer not expired |
| 0.1 sec OFF | ||||
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TABLE 5: Status Code Display |
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Description |
| Required Condition |
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| LED3 (Yellow) | |
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Control normal operation – with active communication present | System is active and presently communicating successfully. | 0.1 sec ON / | ||||
0.1 sec OFF | ||||||
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Control powered – without active communication present |
| System has 24 VAC present and the microprocessor is active. | 2s ON / 2s OFF | |||
Johnson Controls Unitary Products | 13 |
