SD-324M / Page 3
SPORLAN MODEL NUMBERS
STEPS
SEI-.5, SEI-1, SER-1.5, SEI-2, SEI-3.5
SEI-6, SER-6, SEI-11, SER-11, SER-20
1596
SER-B, C, D, G, J, K, L
2500
SEI-30
3193
SEI-50, SEH-100, SEH-175
6386
ESX
400
Table 2 - Electric Expansion Valves
3. SETPOINT MENU OPERATION
See Appendix C - Setpoint Parameters. All setpoints must be veri-
fied prior to system startup for proper system operation. It may be
necessary to adjust these parameters for a specific system. Details
on advanced features can be reviewed in Section 4 - System
Operation.
1. Enter the Setpoint Menu: Press the SELECT knob for 5 sec-
onds. Enter the password “
111
” and press the SELECT knob
again.
2. To view a parameter, rotate the SELECT knob to the desired
parameter and press the knob. The default value will display.
3. Turn the SELECT knob to change the value and then press
the SELECT knob to enter the value and return to the
Setpoint Menu.
4. After all desired parameters are set, turn the SELECT knob to
“
ESC
” and press the knob to save and implement all changes.
Observe the system for proper operation.
NOTE: The Setpoint Menu times out after 60 seconds of
inactivity and you will lose all changes entered.
T
he Kelvin II is now operational and displaying the Process
Values Menu (Appendix B). To view system parameters while
in operation, turn the SELECT knob and scroll through the
menu. Select the desired parameter. For example, to view system
superheat, turn the SELECT knob to
SvPH
. After a few seconds,
the actual system superheat will be displayed. See Appendix B –
Process Values for a description of each variable.
Pressing the SELECT knob at any time will display the Controller
Display Address
CAdr
.
4. SYSTEM OPERATION
The Sporlan Kelvin II controller can be configured as a stand-
alone superheat controller or a refrigerated space temperature con-
troller. The controller can be used in refrigeration systems, chill-
ers, or air conditioning systems. The Kelvin II should not be used
inside of a conditioned space that exceeds product specifications
(See Appendix E - Technical Specifications).
The controller, by default, is designed to control superheat in
refrigerated spaces that use evaporator pressure regulators (EPRs).
In all applications, use a normally closed solenoid valve upstream
of the electronic expansion valve to ensure positive shutoff of
refrigerant flow during power loss.
Refrigeration
Superheat control on cases with EEPR (preferred method):
The Kelvin II will regulate the refrigerant flow entering the evap-
orator to achieve the superheat set point. The EEPR is typically
controlled by a system level controller and provides consistent
evaporator temperatures based on the discharge air set point (set
through the system controller). This combination provides greater
stability in control, increased efficiency of the evaporator coil, and
accurate case temperatures.
Superheat control on cases with liquid line solenoid or suction
stop solenoid valves:
Some applications in refrigeration that typically use mechanical
expansion valves also use a solenoid valve upstream (liquid line)
or downstream (suction stop) of the TEV to control case tempera-
ture. The system controller closes and opens the solenoid valve to
meet cut-in and cut-out temperatures. If the Kelvin II controller is
used on these systems in conjunction with an EEV, a digital input
must be connected to the Auxiliary Temperature Sensor terminals
(27 and 28 in Appendix H – Wiring Diagram). Since refrigerant
flow is a critical part of the Kelvin II control scheme, the con-
troller must be tied into the liquid line solenoid or suction stop
solenoid when flow is stopped. This input allows the controller to
respond to major flow variations upstream or downstream of the
EEV.
Case temperature control using cut-in / cut-out:
The Kelvin II can be used as a thermostat by connecting a room
sensor to T2 (terminals 29 and 30) and setting
C_in
and
Covt
to the desired cut-in and cut-out temperatures respectively. For
optimum control, the room sensor must be located inside the case
as specified by the case manufacturer. Connect a normally closed
solenoid valve (upstream of the EEV) to terminals 19 and 20. The
controller will maximize the efficiency of the evaporator coil by
regulating the EEV to control superheat until the cut-out tempera-
ture is reached. The solenoid valve and EEV will then close until
the temperature rises to the cut-in temperature. During defrosts,
a digital input must be connected to the T3 Temperature Sensor
terminals (27 and 28 in Appendix H – Wiring Diagram) so the
controller will close the EEV. A standard dry contact relay can be
used.
Minimum relay on and off time:
This feature is used to prevent compressor short cycling when
the Kelvin II is used as a thermostat using the
C_in
and
Covt
with the room sensor attached to T2 (terminals 29 and 30) in a
