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SECTION 33 - SYSTEM CALIBRATION, SERVICE SETPOINTS, AND RESET PROCEDURES
1. At the keypad, login at SERVICE access level
using access code 1 3 8 0.
2. Select the REFRIGERANT LEVEL CONTROL
Screen from the CONDENSER Screen.
3. Press the appropriate key to select the setpoint to
be programmed.
(If selecting Period or Rate setpoint, press the SET
ZONES key. A green box appears around the first
changeable setpoint. Use the ▲,▼,◄,► keys to
place the green box around the desired setpoint to
be changed. Press ENTER () key. A dialog box
will appear with the range of settings).
4. Using the numeric keypad keys, enter the desired
value.
5. Press ENTER () key.
Manual Control
The Variable Orifice can be manually controlled as
follows:
1. At the keypad, log in at SERVICE access level
using access code 1 3 8 0.
2. Select REFRIGERANT LEVEL CONTROL
Screen from the CONDENSER Screen.
3. On the REFRIGERANT LEVEL CONTROL
Screen, press the OPEN, CLOSE or HOLD key as
required to control the Variable Orifice to achieve
the desired refrigerant level. Pressing the AUTO
key invokes automatic operation.
Level Sensor Calibration
There are two different versions of the Refrigerant
Level Sensors. The operation of both the sensors is the
same. However, the difference is in the calibration ad-
justments. Some sensors are equipped with adjustable
potentiometers labeled "S"(span) and "Z"(zero). Oth-
ers are equipped with calibration pushbuttons labeled
"F/UP", "E/DN", "MAX", and "MIN".
The calibration instructions for the Refrigerant Level
Sensor is contained in Service Instruction SI0187.
OIL PUMP VARIABLE SPEED DRIVE
On certain model chillers, the oil pump is driven by a
small Variable Speed Drive. A complete description of
the Drive operation and the setpoints that affect this con-
trol are provided in SECTION 18 - OIL PUMP VARI-
ABLE SPEED DRIVE of this manual. The setpoints are
listed below. The Program Variable Speed Drive opera-
282
tion must be ENABLED and the setpoints programmed
using the procedures below. Also, the Oil Pump Speed
can be manually controlled using the procedure below.
Enable/Disable
The Oil Pump Variable Speed Drive Program opera-
tion must be enabled.
The procedure varies according to the microboard in-
stalled as follows:
Microboard 031-01730-000
Program Switch SW1-2 ON – Enabled
Microboard 031-02430-000/001, 031-03630-001
Entered as setpoint on SETUP Screen. Follow proce-
dure later in this section under "Microboard 031-02430-
000/-001, 031-03630-001 Setup/Configuration".
Setpoints
The following are the setpoints and range of program-
mable values. The DEFAULT values (shown in paren-
thesis) are the recommended values and should pro-
vide proper operation in most applications. However,
the setpoints can be programmed to other values as
required.
• Oil Pressure setpoint - 20 to 45 psid (35)
• Control Period – 0.3 to 2.7 seconds in 0.3 second
increments. (0.3)
Enter setpoints using procedure below:
1. At the keypad, log in at SERVICE access level
using access code 1 3 8 0.
2. Select OIL SUMP Screen.
3. On the OIL SUMP Screen, press the appropriate
key to select the setpoint to be programmed.
4. If the Dialog box begins with the word "Enter",
use the numeric keypad keys to enter the desired
value. If it begins with "Select", use the ◄ and ►
keys to select desired value.
5. Press ENTER () key.
Manual Control
The Oil Pump speed can be manually controlled be-
tween 25 and 60(50)Hz as follows:
1. At the keypad, log in at SERVICE access level
using access code 1 3 8 0.
JCI COMPANY CONFIDENTIAL
FORM 160.54-M1
ISSUE DATE: 10/25/2019
OFF – Disabled
JOHNSON CONTROLS
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