RefPlus Guardian+ RC-F Owner's manual

R
PROGRAMMING
MANUAL
FLUID COOLER & PUMP PACKAGE CONTROL
RC-F

2
R
SPECIFICATIONS ................................................................................................................................................................................. 3
REPLACEMENT PARTS ...................................................................................................................................................................... 3
TYPICAL WIRING DIAGRAM ........................................................................................................................................................... 4
OVERALL DIMENSIONS.................................................................................................................................................................... 5
INSTALLATION...................................................................................................................................................................................... 5
INTERFACE KEY DESCRIPTIONS................................................................................................................................................... 6
NAVIGATION PRINCIPLES ....................................................................................................................................................................................... 6
OPERATION PRINCIPLE.................................................................................................................................................................... 7
STATUS AND PROGRAMMING MENU & SUB-MENUS DIAGRAM ................................................................................... 13
MENUS AND PARAMETERS............................................................................................................................................................ 14
VERSION INFO ...................................................................................................................................................................................... 14
STATUS MENU........................................................................................................................................................................................ 15
FACTORY RESET PROCEDURE ........................................................................................................................................................... 18
SETTING UP YOUR CONTROLLER USING THE PROGRAMMING MENU .................................................................................... 20
1. FACTORY SETUP..................................................................................................................................................................................................... 20
SYSTEM SPECIFICATIONS................................................................................................................................................................................... 20
DIGITAL INPUTS.................................................................................................................................................................................................... 32
DELAYS .................................................................................................................................................................................................................. 34
ALARM BUZZERS .................................................................................................................................................................................................. 36
DEVICES RUN HOURS.......................................................................................................................................................................................... 38
ALARMS LOGGING RESET.................................................................................................................................................................................. 39
GENERAL STATUS (NON-ADJUSTABLE) ........................................................................................................................................................... 39
2. USER SETUP............................................................................................................................................................................................................. 40
SETPOINTS............................................................................................................................................................................................................ 41
MAIN PAGE RETURN DELAY............................................................................................................................................................................... 43
3. SERVICE MENU ....................................................................................................................................................................................................... 44
OFFSETS ......................................................................................................................................................................................... 44
TEMPERATURE SETUP ......................................................................................................................................................................................... 45
ENABLE & SWITCH PUMPS................................................................................................................................................................................. 45
4. CLOCK...................................................................................................................................................................................................................... 46
ALARM HISTORY....................................................................................................................................................................................................... 47
ALARM SYSTEM......................................................................................................................................................................................................... 48
SWITCHING THE FLUID COOLER CONTROL ON/OFF......................................................................................................... 49
AUXILIARY DISPLAY SETUP............................................................................................................................................................. 50
CONTROLLER INPUTS & OUTPUTS ............................................................................................................................................. 51
Table of ConTenTs
IMPORTANT NOTE:
In this manual and in the controller interface:
• The system that requires cold uid from the uid cooler is referred to as the REQUIRING UNIT.
• A STAGE is dened as one or more fans controlled simultaneously trough a common signal.
• GLYCOL refers to the uid in the uid cooler. The temperature of the uid at the outlet is called GT.
• Modulating fans refer to ECM variable speed motors (Dynamic fans) or VFD controlled fans.
• ONE-SPEED and TWO-SPEED motors refer to single-speed and twin-speed motors.

3
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speCifiCaTions
ReplaCemenT paRTs
Sensors 1 outlet uid temperature sensor
1 outside temperature sensor
Voltage 208/240/480/575V
Control Voltage 24V (120/240V optional)
Power Input Refer to unit nameplate
Battery Life 10 years (program/data protection)
Operating conditions 14oF to 140oF (-10oC to 60oC), < 90% RH non-condensing
Communication
(optional) Modbus RTU, BACNET MSTP, MODBUS TCP/IP, BACNET IP, SNMP, LonWorks.
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.

4
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TypiCal WiRing DiagRam
#C2
U2
RED
BROWN
YELLOW
YELLOW
ORANGE
M#
WHITE
ORANGE
BLACK
W2
TB
TB
U1
BLACK
BLUE
GRAY
RED
BLUE
V2
V1
W1
#C1 #C3
L1 L2 L3
RED
U2
M#
WHITE
ORANGE TB
TB
W2
BLACK U1
ORANGE
YELLOW
YELLOW
BROWN
RED
BLUE V1
V2
W1 BLACK
GRAY
BLUE
YELLOW
WHITE
M#
TB
V1 BLUE
U2
W2
U1
RED
BROWN
ORANGE
YELLOW
BLUE
BLACK
WHITE
BLACK
TB
W1
V2
BLACK
GRAY
RED
RED
(200)
250VA
FS2
15 Amp
24
FP2
1 Amp
CT2 575
(200)
(105)
GA
(103)
(100)
(100)
(501)
(200)
(100)
(200)
PHONE
CABLE
50m Max.
KEYPAD
OPERATOR
PANEL
(100)
(100)
1C FAN(S) 1
2C FAN(S) 2
3C FAN(S) 3
4C FAN(S) 4
5C FAN(S) 5
6C FAN(S) 6
(104)
(106)
(107)
(108)
(109)
(1041)
(1051)
(1061)
(1071)
(1081)
(1091)
(507)
(508)
(114)
(100)
8C
(1111) 7C
(1101)
9C
(1121)
10C
(1131)
(110)
(111)
(112)
(113)
#R
FAN(S) 7
FAN(S) 8
FAN(S) 9
FAN(S) 10
#ER FAN 1
(104)
(101)
(102)
(504)
(505)
(506)
(502)
(503)
(100)
(100)
(100)
(100)
(300)
(400)
(300)
(400)
NO13
NC13
C13
J18
C12
NO12
NC12
J17
SuperVisaire Controller
NO10
J16
NO11
C9
NO9
C9
NO8
NC8
J15 C8
NO7
J14
C7
NO6
C7
C4
NO5
NO4
J4 J13
C4
NO2
J12
NO3
C1
NO1
J3
C1
575/3/60
L1
L3
L2
RX +
RX -
GRN
J2 J11
J10
G0
J1
GJ9
Serial Cord
RS485
GRN
RX -
RX +
01
02
GENERAL ALARM DRY
CONTACT FOR REMOTE
INDICATION
ID14*
ID10*
ID13*
J8
IDC13
IDC9
ID12*
J7
ID11*
ID9*
GND
U7 J6
U8
U6
IDC1
ID8*
ID7*
J5
ID5*
ID6*
ID4*
ID2
ID3*
ID1
100
501
100
VG0
Y3
Y4
Y2
Y1
VG
GND
GND
U5
U4
GND
+VDC
U3
U1
U2
N.F.D.
TB1
TB2
TB3
TB4
TB5
TB6
FLUID TEMPERATURE
SENSOR
OUTSIDE TEMPERATURE
SENSOR
100
507
24V SIGNAL FROM
UNIT REQUESTING FLUID
SUMMER / WINTER SET
NC14
J21
C14
NO14
M#
NC15
C15
NO15
M#
TB8
TB7
TB9
TB10
TWIN SPEED AND/OR
ADIABATIC SYSTEM INTERLOCK
DETAIL "B"
DETAIL "C"
NO4
PUMP 1
PUMP 2
504
505
506
502
503
100
#C4
CS1
PUMP 1 OVERLOAD
FAN FAILURE ALARM
REMOTE ON/OFF
SWITCH
PUMP 2 OVERLOAD
FLUID LOSS
COM N.O.
PDS
100
508
CURRENT SENSOR RELAY 1
100
CS2
509
CURRENT SENSOR RELAY 2
100
100
100
24
575 CT1
75VA
TO ECM
FAN(S)
M#
H2
H1
H3
X2
X1
X3
M#
1GAR1
BLACK
RED
GREEN
WHITE
GREEN
WHITE
BLACK
RED
BLACKRED BLUE
24V
GND
GND
TO VG0 ON PORT J4
TO Y1 ON PORT J4
D1 E1 A1 24V
GND D1 E1 A1
L3L2L1
M#
E1
0-10V DYNAMIC FAN
FROM CAREL BOARD
L3L2L1
#ER#
BLACKRED BLUE
L3L2L1
M#
#ER#
CLASS II
#C3
WHITE
YELLOW
M#
TB
YELLOW
BLUE
BROWN
RED
ORANGE
V1 BLUE
U2
W2
U1 BLACK
WHITE
BLACK
ORANGE
TB
BLACK
GRAY
W1
V2
RED
RED
#C1 #C2 #L3#L1 #L2#H2 #H3#H1
L1 L2 L3
ORANGE
I1
I2
INTERLOCK
B1
G
ATS
(TO BE INST'L UNDER
ELECTRICAL BOX)
B2
G
LTS
(TO BE INST'L ON LIQUID HEADER)
AVV 06
H3
(200)
(10##)
#R# #L4
#H4
#L
#C
#H
DETAIL "C"
ADIABATIC SYSTEM PARTS
DETAIL "B"
DETAIL "B"
DETAIL "A"
HIGH SPEED WIRING, ADD
JUMPERS ON FOLLOWING:
W1 TO V2
V1 TO U2
U1 TO W2
LOW SPEED WIRING, ADD
JUMPERS ON FOLLOWING:
V2 TO U2 TO W2
ECM WIRING TWIN SPEED
WIRING
MF1
DETAIL "A"
MF#
REGULAR MOTOR(S)
STAGES 1-10
DYNAMIC
MOTOR(S)
(ECM)
RELAY REPLACES CONTACTOR
FOR DYNAMIC MOTOR(S) (ECM)
ATF1
XXXXVA
USE COPPER SUPPLY WIRES
M# : Fan Motor
TB# : Motor Thermal Protection
* Digital inputs (ID#) are configurable
for alarms, current sensors or seasonal
settings
#C : Main Contactor
NFD : Non Fused Disconnect
: Terminal block
(100) : Line number
#R : Relay
ATF# : Auto Transformer Fuse
MF# : Motor Fuses
PDS : Pressure Differential Switch
For reference only. Refer to the wiring diagram supplied with your unit.

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oveRall Dimensions
insTallaTion
WARNING: Before installation or maintenance, always check to be sure that main power to system is OFF.
Electrical shock can cause personal injury or death.
SAFETY CONSIDERATIONS
Installing, starting up, and servicing any equipment can be hazardous due to system pressures, electrical components
and equipment location (elevated structures, etc.). Only trained and qualied installers as well as service technicians or
electricians should install, start-up and service this equipment.
When working on the equipment, observe precautions found in the literature, on the tags, stickers, and labels attached to
the equipment.
Follow all safety codes. Wear safety glasses and work gloves.
S: 226mm (8.9”)
M & L: 315mm (12.4”)
S & M:112.2mm (4.4”)
L:1132mm (5.2”)
69.8mm (2.7”)

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inTeRfaCe Key DesCRipTions
ALARM KEY
Lets you access the Alarm menu (some controller models may have a bell icon)
PROGRAMMING KEY
Lets you access the Programming menu (Prg on some controller models)
ESCAPE KEY
Returns to the Status menu or the previous menu (Esc on some controller models)
DOWN KEY
Lets you navigate down through screens and menus or lets you change the value of a eld
UP KEY
Lets you navigate up through screens and menus or lets you change the value of a eld
ENTER KEY
Lets you conrm a selection and lets you navigate between elds in a screen
NAVIGATION PRINCIPLES
1.Use the keys to navigate between screens.
2.Once on the desired screen, use the key to navigate between elds.
3.Once on the desired eld (blinking cursor), you can change the value using the keys.
Note: Press and hold an arrow key to speed up value change.
4.To conrm your selection, press key (note that your selection is conrmed only after is pressed).
WARNING: For certain parameters, which have only two states (ON/OFF, Enable/Disable, Open/Close, etc.), selections will
be applied immediately, without the need to conrm by pressing .
When changing those parameters, the unit may start inadvertently. Always switch the unit off prior to changing any parameter.

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opeRaTion pRinCiple
The purpose of a uid cooler is to cool a uid (glycol), which will in turn be used by a remote unit (Requiring Unit). The
requiring unit regularly sends a signal to the uid cooler to send cold uid when necessary. This signal tells the uid cooler
to start operating by turning on cooling fans, a pump and a 3-way valve, depending on the conguration of the unit.
The Guardian+ RC-F Controller monitors the outlet uid temperature in real time and uses predictive smart algorithms to
optimize fan cycling and consequently control the outlet temperature. It can be programmed to run a uid cooler with up to
20 fans and can control single-speed, twin-speed or modulating-speed ECM fans. It can also manage up to two pumps as
well as a 3-way valve for an even more precise outlet temperature.
CHOICE OF 5 CONTROL METHODS
The controller can run the system using one of the 5 following control methods. It is important for you to understand
these ve methods in order to choose the one that best suits your needs:
Method 1: Fan cycling over a cooling band. Lower point of the cooling band set by user.
Method 2: PID (Proportional Integrative Derivative). Setpoint set by user. Note: This method provides the smoothest and the
most linear ventilation capacity variation while delivering the most precise outlet temperature.
Method 3: Fan cycling is driven by an external signal (not supplied by RefPlus). Lower point of the cooling band set by user.
Method 4:Fan cycling over a moving cooling band (variant of method 1). Lower point of the cooling band based on outside
temperature and on a differential set by the user. With this method, the controller always provides the lowest possible uid
temperature, depending on the outside temperature.
Method 5:PID (Proportional Integrative Derivative) (variant of method 2). As in method 2, it offers the same advantages in
airow and precision for outlet temperature combined with a temperature setpoint based on outside temperature and on a
differential set by the user. Outlet temperature control precision + the lowest possible uid temperature.
WHAT IS THE SETPOINT, THE COOLING BAND AND THE DIFFERENTIAL?
In methods 2 and 5 (both PID controlled), the Setpoint is the target outlet uid temperature that the controller will try to
maintain. In methods 1, 3 and 4, there is a temperature range rather than a Setpoint, called the Cooling band, within which
the controller will work to maintain the required outlet temperature. The Cooling band has a lower and upper point. The
“Setpoint” parameter becomes the “Lower point of the Cooling band”. The Cooling band range (or length) is set by the user,
using the parameter “Band” under the Service menu. The upper point of the Cooling band is equal to the lower point + Band.
The lower point can either be xed and set by the user or it can be sliding and dependent on the outside temperature + a
differential set by the user. In this last option, the Cooling band will also move to follow changes in the outside temperature,
as shown in Graph 1 below.
The differential is the difference between the outside temperature and the lower point of the Cooling band (method 4) or
between the outside temperature and the Setpoint (method 5). No system, when using outside air, can cool uid down to
outside temperature. Therefore, using outside temperature as the lower point of the Cooling band or Setpoint would make
the controller run unnecessary stages when trying to reach outside temperature, which would result in wasted energy. For
this reason, the user must set a reasonable amount of degrees above outside temperature, which will determine the lower
point of the Cooling band or the Setpoint.
Example where the lower point and Cooling band or Setpoint are controlled by outside temperature:
Outside temperature = 73oF
Differential = 2oF (set by user)
Lower point for Cooling band = 75oF (varies according to outside temp.)
Band = 10oF (set by user)
74OF73OF 75OF 76OF 77OF 78OF 79OF 80OF 81OF 82OF 83OF 84OF 85OF 86OF
COOLING BAND - METHOD 4
(SET BY USER)
DIFFERENTIAL
(SET BY USER)
• Lower point of Cooling band (method 4)
• Setpoint (method 5) Upper point
of Cooling band
(method 4)
COOLING BAND SLIDES FOLLOWING CHANGES IN OUTSIDE TEMPERATURE (METHOD 4)
OUTSIDE
TEMPERATURE
Graph 1: Lower point of cooling band or Setpoint based on outside temperature (control methods 4 & 5)

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METHODS 1 & 4
There are 3 typical scenarios when operating with method 1 or 4. These are the standard methods with fan cycling over a
Cooling band; xed for method 1 or moving for method 4.
SCENARIO 1:
• Fluid cooler has 20 regular ON/OFF fans (10 stages of 2 fans). Fans can be single or twin speed.
• System has one or two pumps.
• Lower point of Cooling band:
Method 1: 75oF (set by user).
Method 4: Outside temperature at 73oF + differential set to 2oF (by user) = 75oF: Refer to Graph 1 for a better
understanding of the Cooling band when using method 4.
• Band set to 10oF by user.
• High speed of fans set to 10% by user.
Since the lower point of the Cooling band is 75˚F and the band is set to 10˚F, the cooling band is from 75˚F to 85˚F.
When the uid cooler is ON but the requiring unit has not sent the signal, the uid cooler remains on stand-by; therefore no
fans or pumps are running. Once the signal is sent (cold uid is required by the requiring unit), the uid cooler runs the fans
according to the outlet uid (glycol) temperature (GT). It will also run the pump(s), if congured.
The software will determine the outlet uid temperature for which each stage will run and stop. The stages are overlapped
to create a bigger gap from ON to OFF points and, consequently, minimize cycling and extend fan life.
When there is a demand (signal sent), the rst stage will immediately start. In this scenario, the second stage will only start
when GT is equal or above 77˚F and stop when GT goes below 75˚F. All other stages will start and stop in a similar way, as
shown in Graph 2 and Graph 3.
High speed of fans set to 10% implies that when GT rises and reaches the end of the Cooling band + 10% of the Cooling
band, the fans will all run at high speed (only for twin-speed fans). 10% of a 10˚F cooling band = 1˚F, meaning that at 86˚F
or above, all fans will run at high speed. If GT drops below 85˚F, they all return to low speed.
Graph 2 and Graph 3 show how the fans (stages) will run according to the uid (glycol) temperature (GT).
REGULAR
FANS
STAGE ON at OFF
below
ST2 77oF 75oF
ST3 78oF76oF
ST4 79oF 77oF
ST5 80oF78oF
ST6 81oF 79oF
ST7 82oF80oF
ST8 83oF81oF
ST9 84oF82oF
ST10 85oF83oF
HS
FAN 86oF85oF
STAGE 2
RAMP UP
STAGE 2
RAMP DOWN
STAGE 3
RAMP UP
STAGE 3
RAMP DOWN
STAGE 4
RAMP UP
STAGE 4
RAMP DOWN
STAGE 5
RAMP UP
STAGE 5
RAMP DOWN
STAGE 6
RAMP UP
STAGE 6
RAMP DOWN
STAGE 7
RAMP UP
STAGE 7
RAMP DOWN
STAGE 8
RAMP UP
STAGE 8
RAMP DOWN
STAGE 9
RAMP UP
STAGE 9
RAMP DOWN
STAGE 10
RAMP UP
STAGE 10
RAMP DOWN
75OF 76OF 77OF 78OF 79OF 80OF 81OF 82OF 83OF 84OF 85OF 86OF 87OF
HIGH-
SPEED
RAMP
DOWN
HIGH-
SPEED
RAMP
UP
COOLING BAND (SET BY USER) 10% of
cooling
band
Lower Point
of Cooling band
SET BY USER HIGH-SPEED
Upper point
of Cooling band
Graph 2: Scenario 1 (control method 1)

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REGULAR
FANS
STAGE ON at OFF
below
ST2 77oF 75oF
ST3 78oF76oF
ST4 79oF 77oF
ST5 80oF78oF
ST6 81oF 79oF
ST7 82oF80oF
ST8 83oF81oF
ST9 84oF82oF
ST10 85oF83oF
HS
FAN 86oF85oF
STAGE 2
RAMP UP
STAGE 2
RAMP DOWN
STAGE 3
RAMP UP
STAGE 3
RAMP DOWN
STAGE 4
RAMP UP
STAGE 4
RAMP DOWN
STAGE 5
RAMP UP
STAGE 5
RAMP DOWN
STAGE 6
RAMP UP
STAGE 6
RAMP DOWN
STAGE 7
RAMP UP
STAGE 7
RAMP DOWN
STAGE 8
RAMP UP
STAGE 8
RAMP DOWN
STAGE 9
RAMP UP
STAGE 9
RAMP DOWN
STAGE 10
RAMP UP
STAGE 10
RAMP DOWN
74OF
73OF75OF76OF 77OF 78OF 79OF 80OF 81OF 82OF 83OF 84OF 85OF 86OF 87OF
HIGH-
SPEED
RAMP
DOWN
HIGH-
SPEED
RAMP
UP
COOLING BAND (SET BY USER) 10% of
cooling
band
Outside
temperature
Differential
BASED ON OUTSIDE TEMP. + DIFFERIENTIAL SET BY USER
Lower point
of Cooling band
HIGH-SPEED
Upper point
of Cooling band
Graph 3: Scenario 1 (control method 4)
SCENARIO 2:
• Fluid cooler has one stage of dynamic fan(s) (Modulating speed ECM fan(s)).
• Fluid cooler has 9 stages of regular ON/OFF fans. Fans can be single or twin speed.
• System has one or two pumps.
• Lower point of Cooling band:
Method 1: 75oF (set by user).
Method 4: Outside temperature at 73oF + differential set to 2oF (by user) = 75oF: Refer to Graph 1 for a better
understanding of the lower point of Cooling band when using method 4.
• Band set to 10oF by user.
• Modulating fan minimum speed set to 20% and maximum speed to 100% by user.
• High speed of fans set to 10% by user.
Since the lower point of Cooling band is 75˚F and the band is set to 10˚F, the cooling band is from 75˚F to 85˚F.
When the uid cooler is ON but the requiring unit has not sent the signal, the uid cooler remains on stand-by, therefore no
fans or pumps are running. Once the signal is sent (cold uid is required by the requiring unit), the uid cooler runs the fans
according to the uid (glycol) temperature (GT). It will also run the pump(s), if congured.
The software will determine the outlet uid temperature for which each stage will run and stop. The stages are overlapped
to create a bigger gap from ON to OFF points and, consequently, minimize cycling and extend fans life.
When there is a demand (signal sent), the modulating fan(s) will immediately start. In this scenario, the rst stage of regular
fans will only start when GT is equal or above 77˚F and stop when GT drops below 75˚F. All other stages will start and stop
in a similar way, as shown in Graph 4.
High speed of fans set to 10% implies that when GT rises and reaches the end of the cooling band + 10% of the band, the
fans will all run at high speed (only for twin-speed fans). 10% of a 10˚F cooling band is 1˚F, meaning that at 86˚F or above,
all fans will run at high speed. If GT drops down below 85˚F, they all return to low speed.
The modulating fan(s) speed depends on the outlet uid temperature (GT). Below the Cooling band, fan speed will be at
minimum. When GT increases (RAMP UP), from the lower point of the Cooling band to the point where the rst stage of
regular fans starts, it will increase proportionally from minimum to maximum speed. Once a regular fan stage starts, the
modulating fan speed decreases to the minimum speed and again it increases proportionally from the minimum to the
maximum speed from this point to the point where the next stage of regular fans starts.

10
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The modulating fan speed will also have this behaviour from the point where the last stage of regular fans starts to the point
where the high-speed of regular fans starts (from 85˚F to 86˚F in our example). Beyond this point, the modulating fan speed
increases proportionally over the next 1˚C (1.8˚F). When GT is decreasing (RAMP DOWN), the behaviour is similar.
See the lines for RAMP UP and RAMP DOWN in Graph 4 below for a better understanding.
NOTE: In case of single-speed fans, the 86oF shown in the graph would represent the point where the modulating fan(s)
would be at maximum speed.
Modulating FAN
(MIN TO MAX)
RAMP UP RAMP DOWN
DEMAND YES
(MIN SPEED)
DEMAND NO
(OFF)
75-77oF75-76oF
77-78oF76-77oF
78-79oF77-78oF
79-80oF78-79oF
80-81oF79-80oF
81-82oF80-81oF
82-83oF81-82oF
83-84oF82-83oF
84-85oF83-85oF
85-86oF85-86oF
86-87.8oF86-87.8oF
REGULAR FANS
STAGE ON at OFF
below
ST1 77oF 75oF
ST2 78oF76oF
ST3 79oF 77oF
ST4 80oF78oF
ST5 81oF 79oF
ST6 82oF80oF
ST7 83oF81oF
ST8 84oF82oF
ST9 85oF83oF
HS FAN 86oF85oF
STAGE 1
RAMP UP
STAGE 1
RAMP DOWN
STAGE 2
RAMP UP
STAGE 2
RAMP DOWN
STAGE 3
RAMP UP
STAGE 3
RAMP DOWN
STAGE 4
RAMP UP
STAGE 4
RAMP DOWN
STAGE 5
RAMP UP
STAGE 5
RAMP DOWN
STAGE 6
RAMP UP
STAGE 6
RAMP DOWN
STAGE 7
RAMP UP
STAGE 7
RAMP DOWN
STAGE 8
RAMP UP
STAGE 8
RAMP DOWN
STAGE 9
RAMP UP
STAGE 9
RAMP DOWN
74OF 75OF 76OF 77OF 78OF 79OF 80OF 81OF 82OF 83OF 84OF 85OF 86OF 87.8OF
HIGH-
SPEED
RAMP
DOWN
HIGH-
SPEED
RAMP
UP
COOLING BAND (SET BY USER)
HIGH-SPEED
1.8OF
Modulating fan
min to max
Lower point
of Cooling band
Upper point
of Cooling band
MODULATING FAN SPEED: 20% (MIN.)
AIR FLOW (RAMP DOWN)
MODULATING FAN SPEED: 100% (MAX.)
AIR FLOW (RAMP UP)
METHOD 1 = SET BY USER
METHOD 4 = BASED ON OUTSIDE TEMP. + DIFFERENTIAL SET BY USER
10% of
cooling
band
Graph 4: Scenario 2 (control methods 1 & 4 with modulating fan)
SCENARIO 3:
• Fluid cooler only has modulating fans (ECM).
• System has one or two pumps.
• Lower point of Cooling band:
Method 1: 75oF (set by user).
Method 4: Outside temperature at 73oF + differential set to 2oF (by user) = 75oF: Refer to Graph 1 for a better
understanding of the lower point of Cooling band when using method 4.
• Band set to 10oF by the user.
• Modulating fan minimum speed set to 20% and maximum speed to 100% by the user.
Since the lower point of the Cooling band is set to 75˚F and the band to 10˚F, the cooling band is from 75˚F to 85˚F.
When the uid cooler is ON but the requiring unit has not sent the signal, the uid cooler remains on stand-by, therefore no
fans or pumps are running. Once the signal is sent (cold uid is required by the requiring unit), the uid cooler runs the fans
according to the uid (glycol) temperature (GT). It will also run the pump(s), if congured.
The speed increases proportionally from minimum to maximum, from the lower to the upper point of the Cooling band.