RefPlus Guardian+ RC-S Owner's manual

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PROGRAMMING
MANUAL
SMART EVAPORATOR CONTROL
RC-S
R4

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SPECIFICATI0NS.......................................................................................................................................................................... 3
ACCESSORIES ............................................................................................................................................................................. 4
DIMENSIONS .............................................................................................................................................................................. 5
COIL SENSOR LOCATION .......................................................................................................................................................... 5
NAVIGATION USING THE BASIC (REMOTE) DISPLAY ............................................................................................................. 6
MENUS AND PARAMETERS
BASIC SETPOINTS MENU................................................................................................................................................. 7
ADVANCED SETPOINTS MENU....................................................................................................................................... 7
TYPES OF CONTROL - FIRST TIME SETUP MENU .......................................................................................................... 9
SYSTEM MODES ............................................................................................................................................................... 9
AUXILIARY INPUT MODES ............................................................................................................................................... 9
VARIABLES MENU............................................................................................................................................................. 9
REFRIGERANTS................................................................................................................................................................. 9
VALVE TYPES ..................................................................................................................................................................... 9
ALARM STATUS MENU ..................................................................................................................................................... 10
ALPHABETICAL LIST OF ABBREVIATIONS ...................................................................................................................... 10
INTRODUCTION TO SMART ACCESS ....................................................................................................................................... 13
REPLACEMENT PARTS ............................................................................................................................................................... 13
WIRING DIAGRAM - POWERED BY EXTERNAL SOURCE (PILOT DUTY)............................................................................... 14
WIRING DIAGRAM - POWERED BY CONDENSING UNIT (LINE DUTY) ................................................................................. 15
Table of ConTenTs
speCifiCaTions
Controller
Input Voltage: 100 VAC - 240 VAC
Ambient Temp: -40°F to 140°F (-40°C to 60°C)
Operating Temp: -40°F to 140°F (-40°C to 60°C)
Inputs:
(3) temperature sensor
(3) multi-use (temp sensor or digital input)
(1) pressure sensor input
Valve Types: unipolar and bipolar stepper motors (12V)
Relays: 1-20A resistive (defrost)
(2) 10A inductive
Auxiliary Input 1: room temp, coil temp, monitor, 2nd temp setpoint, door
switch, external alarm, system off, defrost interlock, defrost
lockout
Auxiliary Input 2:
Auxiliary Input 3:
Communication: Standard TCP/IP
Pressure Transducer
Pressure Range: 0 to 150 psia
Proof Pressure: 450 psi
Burst Pressure: 1500 psi
Operating Temp: -40°F to 275°F (-40°C to 135°C)
Temperature Sensor
Sensor Specs: -60°F to 150°F (-51°C to 65°C) moisture resistant package

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Remote Displays
Part # Description
21232 Basic (Remote) Display w/ 15 ft. cable
21324 Snap track - 12” (305 mm)
21320 Combo Display (no accessories included)
21786 Combo Display - 25 ft. Cable (762 cm)
21320 Combo Display - Junction Box
21781 9V Rechargeable Battery for Combo Display
aCCessories
Temperature Sensors
Part # Description Lead Length
21151 Temperature Sensor Pack - 3-colors 15 ft. (457 cm)
21066 Temperature Sensor Pack - 3-colors 40 ft. (1219 cm)
20199 Temperature Sensor Pack - Black 10 ft. (305 cm)
20200 Temperature Sensor Pack - Black 40 ft. (1219 cm)
21795 Temperature Sensor Pack - Yellow 10 ft. (305 cm)
21793 Temperature Sensor Pack - Green 10 ft. (305 cm)
21794 Temperature Sensor Pack - Blue 10 ft. (305 cm)
Pressure Transducer
Part # Description Lead Length
20201 Pressure Transducer – 0 to 150 psia 10 ft. (305 cm)
20204 Pressure Transducer - 0 to 150 psia 40 ft. (1219 cm)
RSV - Refrigeration Stepper Valves
Valve Body Part # Connections - Inches ODF
Inlet x Outlet Lead Length
RSV-100 21667 3/8 x 1/2 5 ft. (152 cm)
RSV-100 21665 3/8 x 1/2 10 ft. (305 cm)
RSV-100 21666 3/8 x 1/2 40 ft. (1219 cm)
RSV-130 21169 3/8 x 1/2 5 ft. (152 cm)
RSV-130 21161 3/8 x 1/2 10 ft. (305 cm)
RSV-130 21162 3/8 x 1/2 40 ft. (1219 cm)
RSV-220 21170 3/8 x 1/2 5 ft. (152 cm)
RSV-220 21163 3/8 x 1/2 10 ft. (305 cm)
RSV-220 21164 3/8 x 1/2 40 ft. (1219 cm)
RSV-320 21171 3/8 x 1/2 5 ft. (152 cm)
RSV-320 21165 3/8 x 1/2 10 ft. (305 cm)
RSV-320 21166 3/8 x 1/2 40 ft. (1219 cm)
RSV-320 21672 1/2 x 1/2 5 ft. (152 cm)
RSV-320 21167 1/2 x 1/2 10 ft. (305 cm)
RSV-320 21168 1/2 x 1/2 40 ft. (1219 cm)
RSV-400 21529 5/8 x 7/8 15 ft. (457 cm)
RSV-400 21530 5/8 x 7/8 40 ft. (1219 cm)
RSV-550 21594 5/8 x 7/8 15 ft. (457 cm)
RSV-550 21595 5/8 x 7/8 40 ft. (1219 cm)
RSV-650 21779 5/8 x 7/8 15 ft. (457 cm)
RSV-650 21778 5/8 x 7/8 40 ft. (1219 cm)
RSV-C10 Stator 21149 For RSV-100 to 320 10 ft. (305 cm)
RSV-C40 Stator 21150 For RSV-100 to 320 40 ft. (1219 cm)
RSV-LC15 Stator 21525 For RSV-400 to 650 15 ft. (457 cm)
RSV-LC40 Stator 21526 For RSV-400 to 650 40 ft. (1219 cm)

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Dimensions
sTeps To ensure proper Coil sensor loCaTion
Remote (Basic) Display
IMPORTANT
Installing the Sensor - The most active portion of the sensor is the rst 1/2” of the
probe.
The coil sensor acts as defrost termination sensor, and must be installed
where frost is last to disappear during defrost to ensure a clear coil.
The inset photo in Figure 2 shows that the sensor is positioned so that it is touching two
circuittubes. When insertingthe sensor intothe coil, thetip should touchone of thecircuit
tubes, and the probe should be inserted into the ns approximately 1/16” deeper than
the stainless shielding. Pinch the ns gently together, securing the sensor in place. This
provides thermal ballast to ensure a complete defrost.
NOTE: The sensor should not be located adjacent to the electric heating
elements. It should be about half the distance between the heaters if possible.
Alternate Method - As the defrost termination sensor, it is important to ensure the
sensor does not terminate defrost before all frost is removed from the coil. In some
installations, inserting the sensor into the coil may position it too close to the defrost
heat source. An alternate method of positioning, Figure 3a, places the sensor ver-
tically between the coil ns. Figure 3b shows the coil sensor properly secured.
NOTE: On a small fraction of installations the sensor placement may require
adjusting. This is typically caused by product loading, door openings, air ow,
etc. The sensor(s) should be placed where the frost disappears last on the coil.
Extending sensor wires
After the sensors are mounted, they are routed back to the controller. If the wires must
be extended,use 18 gauge twisted shielded pair. Maximum, combined length, for
extension: 100 ft. Contact RefPlus Therm if planning to extend sensor wires beyond
100 ft.
If additional resistance affects the temperature or pressure reading of the controller,
the temperature and pressure may be “offset” to read correctly. Use the OFFSET*
function, in the SETPOINTS menu.
When running the sensor wires to the controller avoid introducing electrical noise.
Electrical noise can occur when sensor wires are located near high voltage lines.
Underwriter’s Laboratories denes high voltage as above 30V. The higher the volt-
age, the more likely electrical noise will occur.
If crossing a high voltage line is necessary, run sensor wiring at right angles to
prevent noise.
* Not available on Basic (Remote) Display.

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navigaTion using The basiC (remoTe) Display
Basic (Remote) Display User Interface
Most Guardian+ controllers ship with the Basic Display. The
display allows service technicians to change the major setpoints.
Setpoints can also be accessed using the Guardian+ Combo
Display or the controller’s web pages.
Controller Setup
Upon initially applying power to the controller, the controller
will initialize, then automatically enter Introduction Mode. The
Introduction Mode consists of four Types of Control options:
Ed - Electric Defrost with Mechanical TEV
EdE - Electric Defrost with Electric Expansion Valve
Ad - Air Defrost with Mechanical TEV
AdE - Air Defrost with Electric Expansion Valve
Step 1 - Using the and arrows, moves the user through
the available Types of Control options. Once the preferred
option is displayed press and hold the ENTER button for 3
seconds.
Note: For mechanical valve control, Ed and Ad options,
continue to Step 4. For Ede and AdE control options
continue to Steps 2, 3, &4.
Step 2 - Next, the controller prompts for the Expansion Valve
Type, and displays rS (RSV). If this is the correct selection,
press and hold the ENTER button for 3 seconds.
If not, use the or arrow to move to the correct valve.
With correct electric valve displayed, press and hold ENTER for
three seconds.
Note: Custom valve setup is not available from the Basic
Display.
Step 3 - The controller now prompts for Refrigerant Type
and displays 404 (R-404a) as the default. Change this value by
pressing the or arrow. Once you have the correct value,
press and hold ENTER for three seconds.
Step 4 - The fourth prompt is whether SMART ACCESS is
ENABLED or DISABLED. SMART ACCESS allows you to
easily view your controller online. Make your selection by using
the or arrow, and then press and hold ENTER for three
seconds. THESE ARE THE ONLY SETPOINTS REQUIRED
TO BEGIN CONTROLLING THE SYSTEM.
Additional Setpoints
For the majority of users, the Basic Display will provide the
necessary parameters to setup the controller.
From the default display, pressing the and arrows will cycle
through the Variables menu. The ENTER button will toggle
between the variable name and value.
Changing Setpoints
Pressing and holding the ENTER button will enter the Basic
Setpoints menu. Press ENTER button to toggle between set
point and value.
Pressing and holding the BACK button will enter the Advanced
Setpoints menu. Press ENTER button to toggle between
setpoint and value.
When the parameter value is displayed it may be changed by
using and arrows, and ENTER buttons. The and
arrows will increase or decrease numerical values, and will scroll
through the available options, on the non-numerical setpoints.
Press and hold the ENTER button for 3 seconds to save the
displayed value.
To abort changes, press BACK to return to the parameter
abbreviation.
Manual Valve Control
Press and hold the BACK button & arrow to put the EEV
in Manual Control mode. and arrows will control the valve
opening. ENTER will advance to the next digit, and BACK will
exit this mode.
Manual Defrost
Press and hold
ENTER
and to put the controller into Defrost
(next mode).
Diagnostics Mode
The Guardian+ has been programmed with a diagnostics mode.
When activated, the controller energizes each relay for 60
seconds. When the compressor relay is on the EEV will regulate
to the Superheat setpoint.
Display Firmware
Pressing and holding all 4 buttons ( BACK and ENTER )
will show the display’s rmware revision (dir – Display Revision)
Display Options
Simultaneously pressing and holding the and arrows will
show the address of the display (reserved for future versions).
Web Login
The User Name and Password are required when accessing the
controller using the web page.
The defaults are: User Name: ke2admin Password: ke2admin
IMPORTANT: For security purposes, the User Name and
Password should be changed from the default.

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menus & parameTers

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menus & parameTers

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menus & parameTers

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menus & parameTers

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menus & parameTers

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menus & parameTers

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Introduction to Smart Access
Smart Access provides quick and easy, real time access to your
refrigeration systems, 24/7
Now it’s easier than ever to monitor and adjust your Guardian+
remotely. While the Guardian+’s free connectivity is still avail-
able, some customers prefer the simplicity and convenience of
Smart Access to enjoy the benets of the controller’s communi-
cation capability.
All the Guardian+ needs is a physical connection to the network
router with a cat 5 cable. Once enabled, Smart Access quickly
connects to your personal web portal, hosted by KE2 Therm,
and provides a “customized” dashboard of all the controllers you
setup with Smart Access, akk for a nominal monthly fee. No port
forwarding. No VPN.
Smart Access - Online Access In 3 Easy Steps
Preliminary
Connect the Guardian+ to the customer’s network.
Step Enable Smart Access in the Set points
menu
After the initial Introduction Mode setup, press and
hold the ENTER button.
Press the arrow two times to view SA
(abbreviation for Smart Access). Press ENTER ,
then use the arrow to change diS (disabled) to
EnA (enabled)
Press and hold the ENTER button for 3 seconds to
save the change.
Step Go to smartaccess.ke2therm.net
Using your PC, tablet or smartphone, enter
http://smartaccess.ke2therm.net in the web
browser’s address bar.
Step Enter default information and click Log In
button
Site: installer
Password: controller’s Mac Address (from sticker
on back of controller).
Replacement paRts
Please refer to the Replacement Parts Catalogue available online at www.refplus.com
(https://refplus.com/en/parts-services/)
All RefPlus products have a nameplate with a QR code that you can scan to obtain the unit’s technical
pedigree as well as a list of replacement parts.
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Wiring Diagram - poWereD by exTernal sourCe (piloT DuTy)
X1
Y1
K1
K2
T1
S1
14
12
11
212
R212
COMPRESSOR RELAY
E1
Z1
D1
COM
NO
NC
COM
FAN RELAY
DEFROST RELAY
RJ45
TEMPERATURE SENSOR
TAUX
+
AUX3
AUX2
L1
NO
NO
NC
L2/N
TCOIL
TAIR
TSUCT
PRESSURE
TRANSDUCER
LIQUID LINE SOLENOID/
COMP CONTACTOR RELAY
NO
NO
-
RS-485
+-
SHIELD DISPLAY
VOUT 0-10V
GND
ELECTRIC VALVE
BK - BK
RD - WH
YE - GN
OG - RD
BU - EMPTY
RSV - HSV
SS
AS
TS
TS
EXV
CFR
PT
HS
1T
1F
LS
USE COPPER CONDUCTOR ONLY
KE404 GUARDIAN 1
LEGEND
- - - - : BY OTHERS
□ : TERMINAL BLOCK
TS TEMPERATURE SENSOR (DEFROST)
AS : AIR TEMPERATURE SENSOR (ROOM)
SS : SUCCION TEMPERATURE SENSOR
HS : HEATER SAFETY
LS : LIQUID LINE SOLENOID VALVE
DH : DEFROST HEATER
PT : PRESSURE TRANSDUCER
M# : FAN MOTOR INTERNALLY PROTECTED

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Wiring Diagram - poWereD by ConDensing uniT (line DuTy)
AS
SS
HS
LS
TS
TS
EXV
PT DH
BLACK
RED
WHITE
COM
NO
NC
COM
FAN
RELAY
DEFROST
RELAY
RJ45
TEMPERATURE SENSOR
EEV
BLK
WHT
GR
RD
EMPTY
+
AUX3
AUX2
L1
NO
NO
NC
L2/N
TCOIL
TAIR
TSUCT
PRESSURE
TRANSDUCER
COMP CONTACTOR RELAY
LIQUID LINE SOLENOID/
NO
NO
-
RS-485
+ -
SHIELD
DISPLAY
VOUT 0-10V
GND
NC
TAUX
RED
BLACK
GREEN
CFR
M2M1 M3
LEGEND
- - - - : BY OTHERS
□ : TERMINAL BLOCK
TS TEMPERATURE SENSOR (DEFROST)
AS : AIR TEMPERATURE SENSOR (ROOM)
SS : SUCCION TEMPERATURE SENSOR
HS : HEATER SAFETY
LS : LIQUID LINE SOLENOID VALVE
DH : DEFROST HEATER
PT : PRESSURE TRANSDUCER
M# : FAN MOTOR INTERNALLY PROTECTED
240/1/60
FROM COND. UNIT
USE COPPER CONDUCTOR ONLY
KE2 GUARDIAN

The RefPlus EcoEcient+ program aims to improve your environmental
footprint by reducing refrigerant leakage, noise and power
consumpon with uncompromising performance.
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IOM_GUARDIAN+ RC-S CONTROLLER_EN-R4
RefPlus Inc. reserves the right to make any changes in the design or
specications of any product at any time without notice.
© Copyright 2023 by RefPlus Inc.
09/23
USA & CANADA 1-888-816-2665 / refplus.com
2777 Grande-Allée,Saint-Hubert, Québec,Canada,J4T 2R4 T450 641-2665 F450 641-4554
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