Specifications

27
Set Point 1
— When Set Point Select (Setpoint Select, SP.SE)
is configured to 1 (Setpoint 1), the unit’s active set point is
based on Cooling Set Point 1 (Cooling Setpoint 1, CSP.1).
To configure this option with the Touch Pilot™ display:
To change this value, a Control Point Force must be applied.
When configured correctly, Setpoint Control will indicate
Setp 1.
To configure this option with the Navigator™ display:
Set Point 2
— When Set Point Select (Setpoint Select, SP.SE)
is configured to 2 (Setpoint 2), the unit’s active set point is
based on Cooling Set Point 2 (Cooling Setpoint 2, CSP.2).
To configure this option with the Touch Pilot™ display:
To change this value, a Control Point Force must be applied.
When configured correctly, Setpoint Control (Status
GENUNIT) will indicate Setp 2.
To configure this option with the Navigator™ display:
4 to 20 mA Input
— When Set Point Select (Setpoint Select,
SP.SE) is configured to 3 (4-20 mA Setp), the unit’s active set
point is based on an field supplied, external 4 to 20 mA signal
input to the Energy Management Module (EMM). Care should
be taken when interfacing with other manufacturer’s control
systems, due to power supply differences of full wave bridge
versus half wave rectification. The two different power sup-
plies cannot be mixed. ComfortLink controls use half wave
rectification. A signal isolation device should be utilized if a
full wave bridge signal generating device is used.
The following equation is used to control the set point. See
Fig. 18.
Fahrenheit Set Point = 10 + 70(mA – 4)/16 (deg F)
Celsius Set Point = –12.2 + 38.9(mA – 4)/16 (deg C)
To configure this option while using a Touch Pilot™ dis-
play:
To change this value, a Control Point Force must be applied.
When configured correctly, Setpoint Control will indicate 4-
20 mA.
To configure this option while using a Navigator™ display:
Dual Switch
— When Set Point Select (Setpoint Select,
SP.SE) is configured to 4 (Dual Setp Sw), the unit’s active set
point is based on Cooling Set Point 1 (Cooling Setpoint 1,
CSP.1) when the Dual Set Point switch contact is open and
Cooling Set Point 2 (Cooling Setpoint 2, CSP.2) when it is
closed.
To configure this option while using Touch Pilot™ display:
To change this value, a Control Point Force must be applied.
When configured correctly, Setpoint Control will indicate
Setp Sw.
To configure this option while using a Navigator™ display:
DISPLAY NAME PATH
LINE
NO.
VALUE
Setpoint Select Status GENUNIT 25 1 (Set Point 1)
ITEM ITEM EXPANSION PATH VALUE
SP.SE Setpoint Select Operating Modes SLCT Setpoint 1
DISPLAY NAME PATH
LINE
NO.
VALUE
Setpoint Select Status GENUNIT 25 2 (Set Point 2)
ITEM ITEM EXPANSION PATH VALUE
SP.SE Setpoint Select Operating Modes SLCT Setpoint 2




DISPLAY NAME PATH
LINE
NO.
VALUE
Setpoint Select Status GENUNIT 25 3 (4-20 mA Input)
ITEM ITEM EXPANSION PATH VALUE
SP.SE Setpoint Select Operating Modes SLCT 4-20 mA Setp
DISPLAY NAME PATH
LINE
NO.
VALUE
Setpoint Select Status GENUNIT 25
4 (Dual
Setpoint Switch)
ITEM ITEM EXPANSION PATH VALUE
SP.SE Setpoint Select Operating Modes SLCT
Dual
Setp Sw




0
10
20
30
40
50
60
70
80
90
10 12 14 16 18 20
mA Signal
Set Point (F)
Min LWT = 14 F, Cooler Fluid Type = 2, FLUD = Brine
Min LWT = 38 F, Cooler Fluid Type = 1, FLUD = Water
02468
Max LWT
Fig. 18 — 4 to 20 mA Set Point Control
A30-4830