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Description
The Kelvin II is a standalone superheat controller. The Kelvin
II may be connected with a MODBUS master or a Network
Master to give remote access to pressure and temperature
readings in addition to viewing and editing the controller’s
setpoints. The user can also take advantage of the easy to use
local display or a Remote Display to accomplish the same
tasks.
1. Kelvin II Configuration
Specifications
n
Input Voltage: 24 VAC (± 10%), 40 VA minimum to board
with external transformer
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Operating ambient temperature: -40°F to 120°F
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LED: One Power LED
n
Communications: 1 RS485 Port, 1 USB port
(Not operational)
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4 Digit 7 segment display
n
Inputs:
– Optical Encoder (Knob)
– One Pressure Input
– Three Temperature inputs
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Valve Control of all Sporlan Electric Expansion Valves
“EEV”
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3 amp Solid State Relay for Liquid Line Solenoid Kelvin II
w/o Local Display
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1 amp Solid State Relay for Liquid Line Solenoid Kelvin II
w/Local Display
2. Kelvin II Connections
The Kelvin II has screw terminals on the each side of the
controller. The controller should be wired as follows and as
shown in Figure 1.
Item
Wire (line)
Kelvin II
connect point
Power
24VAC
1
24 VAC
2
Valve
SEI, SER, SEH ESX
—
N/C
Gray
4
Black
Orange
5
White
Yellow
6
Green
Red
7
Red
Black
8
RS-485
Ground
13
A+
14
B-
15
Liquid Line Solenoid
Line
19
Load
20
Auxiliary Temperature Sensor
(Displayed menu item: S-3)
T3
27
28
Room Temperature Sensor
(Displayed menu item: CtP)
T2
29
30
Coil Out Temperature Sensor
(Display option: tout)
T1
31
32
Pressure Transducer
(Displayed menu item: SucP)
Sense (WHITE)
33
Ground (GREEN)
34
+5 VDC (BLACK)
35
3. Kelvin II Display
Upon the first power-up from Sporlan, the Kelvin II will en
-
ter the setup menu. This menu allows the user to set some
critical setpoint values, seen in Table 1, before the controller
will operate. These critical values can be set via the local or
remote displays, MODBUS, or Network Master. (Note: Only
the Valve Type and Refrigerant have to be set via MODBUS
or Network Master for the controller to operate) Once these
values are entered the Kelvin II will then begin its control. If
the setup menu is displayed on the local or remote displays
1
24 VAC
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
19
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
24 VAC
N/C
N/C
N/C
N/C
N/C
Ground
RS-485 A+
RS-485 B-
N/C
N/C
N/C
Load
Line
N/C
N/C
N/C
N/C
N/C
N/C
T3-
T3+
T2-
T2+
T1-
T1+
PWR
Room
Tout
RS485
Valve
LL Sol
N/C
Pressure
Aux
SER, SEI, SEH ESX
Red
Black
Green
Red
White
Yellow
Black
Orange
N/C
Gray
Black
Green
White
+5VDC
Ground
Sense
Figure 1
