Bulletin 100-50-5.1 – Page 5
NOTE: Not all refrigeration systems are designed alike.
See Section 7 - PID Tuning to adjust the settings accord-
ing to the specific needs of the system.
SUPERHEAT CONTROL WITHOUT DISPLAY
To set up a Superheat Control without display that is con-
nected to either a Kelvin IId (remote display unit) or a
Superheat Control with display, first go to Section 5 -
Display Networking to establish a network connection.
Then follow the directions in this section and in Section 3 -
Setpoint Menu Operation.
FACTORY RESET
It may be desired to set all of the setpoints of the control
back to the factory defaults. Should that need arise, the user
can perform this function by doing the following steps:
1. With the controller powered off, press and hold the knob
on the display.
2. Power on the controller while the knob is still depressed.
3. The knob may be released once “FrSt” is seen on the
screen.
The controller will now require the user to complete the
setup process before continuing.
3. Setpoint Menu Operation
See Appendix C - Setpoint Parameters. All setpoints must be
verified 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. To enter the Setpoint Menu: Press the SELECT knob
for 5 seconds. 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.
The Superheat Control is now operational and displaying the
Process Values Menu (Appendix B). To view system param-
eters 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 dis-
played. 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 Superheat Control can be configured as a stand-
alone superheat controller or a refrigerated space tempera-
ture controller. The controller can be used in refrigeration
systems, chillers, or air conditioning systems. The Superheat
Control 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 regula-
tors (EPRs). In all applications, it is recommended to 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 (pre-
ferred method): The Superheat Control will regulate
the refrigerant flow entering the evaporator to achieve the
superheat setpoint. The EEPR is typically controlled by a
system level controller and provides consistent evaporator
temperatures based on the discharge air setpoint (set through
the system controller). This combination provides greater sta-
bility in control, increased efficiency of the evaporator coil,
and accurate case temperatures.
Superheat control on cases with liquid line sole-
noid or suction stop solenoid valves:
Some applications in refrigeration that typically use mechani-
cal expansion valves also use a solenoid valve upstream
(liquid line) or downstream (suction stop) of the TEV to
control case temperature. The system controller closes and
opens the solenoid valve to meet cut-in and cut-out tempera-
tures. If the Superheat Control 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 Superheat Control scheme, the controller
must be tied into the liquid line solenoid or suction stop sole-
noid 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 Superheat Control can be used as a thermostat by con-
necting a room temperature sensor to T2, terminals 29 and 30,
and setting C_n and Cvt to the desired cut-in and cut-out
temperatures, respectively. For optimum control, the room
sensor must be located inside the case as specied by the
refrigerated case manufacturer. Connect a normally closed
liquid line solenoid valve to terminals 19 and 20. The solenoid
valve should be wired so that the Superheat Control is cutting
one leg of the supply voltage. Terminals 19 and 20 may also
pilot a compressor relay in place of the liquid line solenoid on
smaller standalone systems. Note relay ratings specied in the
wiring diagram located in the appendix. The controller will
maximize the efciency of the evaporator coil by regulating
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