Operational Mode Display; Status Code Display - York CZH Installation Manual

TABLE 2: TEST Input Functionality
Duration of
connection (seconds)
< 2
2 <
Connection removed
Connection not removed
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 single-stage compressors, and no loads be attached to the
M1 terminal of the control for a scroll two-stage compressor.
Do not connect any loads to the M1 or M2 terminals of the control
for single-stage compressors, and no loads should be attached to
the M1 terminal of the control for scroll two-stage compressor.
Incorrect system behavior could result.
TABLE 4: Status Code Display
Description
No power to control
First-stage compressor operation – TS or UltraTech
Second-stage compressor operation - TS, UltraTech, or
Single Stage
Control normal operation – no communication or call for
compressor present
Control normal operation – in ASCD period
TABLE 5: Status Code Display
Description
Control normal operation – with active communication present
Control powered – without active communication present
Johnson Controls Unitary Products
Control Behavior with no system
master signals present
No response
Display compressor type TS, Ultratech, or
single stage compressor, Ignore LPS
Clear soft lockout
Clear hard lockout
Reset TS anticipation mode counter
to zero for TS systems.
Resume normal LED display
Nothing more than previously explained
Required Condition
No power to control
TS – M & M1 energized,
UltraTech – M energized,
Single Stage - NA
TS and UltraTech – M & M2 energized,
Single Stage – M energized
No faults active, Y1 or Y2 not present
No faults active, Y1 or Y2 present,
ASCD timer not expired
Bypass ASCD (Reduce timer to zero immediately).
If Y1 (thermostat or communication) is present and the
high-pressure switch is closed, contactors will be energized.

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
Single Stage Compressor
TS Compressor
UltraTech Compressor

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.
Required Condition
System is active and presently communicating successfully.
System has 24 VAC present and the microprocessor is active. 2s ON / 2s OFF
835965-UIM-C-0814
Control behavior with system
master signals present
No response
Clear soft lockout
Clear hard lockout
Reset TS anticipation mode counter
to zero for TS systems.
Reduce TS staging delays for TS
systems as described below.
LED1 (Red)
1 flash
2 flashes
3 flashes
LED1 (Red)
OFF
OFF
ON
OFF
OFF
LED2 (Green)
---
---
---
LED2 (Green)
OFF
ON
ON
2s ON / 2s OFF
0.1 sec ON /
0.1 sec OFF
LED3 (Yellow)
0.1 sec ON /
0.1 sec OFF
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