Page 84
– Bulletin 100-50-9.1
6.21 WALK-IN SINGLE EVAPORATOR WITH EEV – CONFIGURATION U
The S3C case controller is capable of controlling and monitoring walk-in coolers and freezers equipped with electric
defrost. For a single coil walk-in with an EEV, one S3C case controller is required. In the scenario detailed above, the user
has two choices of control method. Method one involves return air temperature (box temperature) control using the EEV.
Method two involves superheat control with the EEV and cut-in/cut-out temperature control by pulsing the optional liquid
line solenoid valve and opening/closing the EEV.
To configure the S3C control package for configuration U
shown above, follow these directions:
If the controller has not been factory set, then upon initial
start-up, the controller will be in set-up mode and the
screen will display
(for self-contained case).
1. Press the
SET
button, then use
▲▼
buttons to scroll
to
o
; press
SET.
This will configure the controller to
support a remote case.
2. Press the
SET
button when
(Rack Identifier)
is displayed. Use the
▲▼
buttons to configure the 4
character Rack Identifier.
Note: Push
▲
button for
numeric,
▼
for alpha characters.
When satisfied
with each digit, press the
SET
button to go to the next
digit. Pressing
SET
multiple times will move to the next
parameter.
3. Press the
SET
button when
ud
(Line-up Identifier)
is displayed. Use the
▲▼
buttons to configure the 4
character Line-up Identifier.
Note: Push
▲
button for
numeric,
▼
for alpha characters.
When satisfied
with each digit, press the
SET
button to go to the next
digit. Pressing
SET
multiple times will move to the next
parameter.
4. Press the
SET
button when
d
(Case Identifier)
is displayed. Use the
▲▼
buttons to configure the 4
character Case Identifier.
Note: Push
▲
button for
numeric,
▼
for alpha characters.
When satisfied
with each digit, press the
SET
button to go to the next
digit. Pressing
SET
multiple times will move to the next
parameter.
5. Press the
SET
button when
(Application Type) is
displayed. Use the
▲
button and scroll to
(Walk-
In); press
SET.
6. Press the
SET
button when
(Local Stepper Valve
Configuration) is displayed. Use the
▲
button to scroll
to
(Electronic Expansion Valve); press
SET.
This
is the valve that is attached to the main S3C Case
Controller.
7. Press the
SET
button when
(Expansion Valve
Type) is displayed. Use
▲▼
buttons to choose the
Expansion Valve Type based on the below chart; press
SET.
Display
Meaning
u
Pulse Width Modulation Valve
5
500 Step Valve
1596
1596 Step Valve
25
2500 Step Valve
3193
3193 Step Valve
6386
6386 Step Valve
u
Custom Stepper Valve (See Section 11)
EEV 1
Suction
CASE
Liquid
Liquid Line
Solenoid
(optional)
WALK-IN SINGLE EVAPORATOR WITH EEV – CONFIGURATION U
