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SECTION 34 - DIAGNOSTICS AND TROUBLESHOOTING
FORM 160.54-M1
ISSUE DATE: 10/25/2019
JOHNSON CONTROLS
JCI COMPANY CONFIDENTIAL
34
ANALOG INPUTS TEST SCREEN
00341VIP
FIGURE 117 -
ANALOG INPUTS TEST SCREEN
This diagnostic is used to analyze the Analog Inputs to
the microboard. The voltage level of each Analog In-
put, as interpreted by the microboard, is displayed. The
counts listed for each parameter is the Analog-to-Digi-
tal (A/D) converter value and is for manufacturing and
engineering use only.
If the chiller is shutting down on an Analog Safety or
is prevented from starting because of an Analog Input,
there is probably an Analog Input problem. This screen
can be used in the investigation of this problem.
Important!
This test does not apply to
the Leaving Chilled Liquid Temperature
Analog Input, Proximity probe DC Volt-
age reference or a 0 to 10 VDC Remote
Setpoint input at channels 27 and 28.
The following is a list of the Analog Inputs displayed.
See the appropriate Section of this manual for an ex-
planation of each:
ULE (CM-2), SECTION 13 - SOLID STATE START-
ERS, SECTION 15 - PROXIMITY PROBE, SECTION
17 - REFRIGERANT LEVEL CONTROL, SECTION 20
- PRESSURE TRANSDUCERS, AND SECTION 21 -
Channel
0 - +2.5 VDC Analog supply voltage reference.
Microboard TP6.
1 - Not Used
2 - Return Chilled Liquid Temperature
3 - Leaving Condenser Liquid Temperature
4 - Return Condenser Liquid Temperature
5 - Drop Leg Refrigerant Temperature
6 - Discharge Temperature
7 - Oil Temperature
8 - Evaporator Refrigerant Temperature
9 - Condenser Pressure
10 - Evaporator Pressure
11 - Sump Oil Pressure
12 - Pump Oil Pressure
13 - Proximity probe DC Voltage Reference
(Not applicable to P compressors and style "F"
and later chillers with “G, Q” and “H5-8” com-
pressors)