RefPlus Guardian+ RC-A Owner's manual

R
PROGRAMMING
MANUAL
OPTI-MIST PLUS ADIABATIC CONTROL
RC-A
VERSION 1.4

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SpecificationS

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INTERFACE KEY DESCRIPTIONS................................................................................................................................................... 4
NAVIGATION PRINCIPLES................................................................................................................................................................................... 4
OPERATION PRINCIPLE / SEQUENCE OF OPERATION ....................................................................................................... 5
COOLING DEMAND .................................................................................................................................................................................................. 5
SYSTEM SELECTION: PULSING VALVE ............................................................................................................................................................... 5
SYSTEM SELECTION: MODULATING PUMP..................................................................................................................................................... 9
STATUS AND PROGRAMMING MENU & SUB-MENUS DIAGRAM ................................................................................... 11
MENUS AND PARAMETERS............................................................................................................................................................ 12
VERSION INFO ...................................................................................................................................................................................... 12
STATUS MENU (SYSTEM STATUS & RUN HOURS)............................................................................................................................ 13
FACTORY RESET PROCEDURE ........................................................................................................................................................... 14
SETTING UP YOUR CONTROLLER USING THE PROGRAMMING MENU .................................................................................... 16
1. FACTORY SETUP..................................................................................................................................................................................................... 16
SYSTEM SPECIFICATIONS .................................................................................................................................................................................. 17
COMMUNICATION SETTINGS ..................................................................................................................................................................... 19
DIGITAL INPUTS.................................................................................................................................................................................................... 20
DELAYS .................................................................................................................................................................................................................. 22
FEATURES/ALARMS ENABLE/DISABLE ............................................................................................................................................................. 23
DEVICES RUN HOURS (RESET AND STORE SETTINGS).................................................................................................................................. 24
ALARMS LOGGING RESET.................................................................................................................................................................................. 25
2. USER SETUP............................................................................................................................................................................................................. 26
TEMPERATURE SETTINGS................................................................................................................................................................................... 26
MAIN PAGE RETURN DELAY ............................................................................................................................................................................... 27
3. SERVICE MENU ....................................................................................................................................................................................................... 27
OFFSETS ......................................................................................................................................................................................... 28
TEMPERATURE SETTINGS................................................................................................................................................................................... 28
SERVICE ALARMS SETTINGS .............................................................................................................................................................................. 29
RUN HOURS RESET (FOR SERVICE ALARMS) ................................................................................................................................................... 29
4. CLOCK ........................................................................................................................................................................................................ 30
ALARM HISTORY....................................................................................................................................................................................................... 31
ALARM SYSTEM................................................................................................................................................................................... 32
SWITCHING THE ADIABATIC CONTROL ON/OFF ................................................................................................................. 33
table of contentS

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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 system may start inadvertently. Always switch the system off prior to changing any
parameter.

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operation principle / Sequence of operation
The Opti-Mist® Adiabatic pre-cooling system is designed to
help uid coolers, gas coolers and condensers keep their
outlet temperature or pressure under control during high
temperature waves or to increase cooling capacity when a
smaller than desired unit is installed due to limited space.
The system is controlled by the Guardian+ RC-A controller
(PLC) to ensure a fully automatized operation and to run the
system only when necessary. It atomizes water at the air
inlet of the coils (of cooler or condenser) to absorb the heat
and increase its cooling capacity. The amount of atomized
water can be easily adjusted according to the unit needs.
On most systems, once the maximum ventilation capacity
of the cooler is reached, a signal is sent to the adiabatic
system, allowing it to run. If the temperature controlling
the system (either uid or outside) reaches a certain point
and if the piping from the pump to the nozzles is empty, the
controller starts the pump, opens the valve on the pump’s
outlet, closes the drain valve, energizes the water treatment
system and after a delay (to purge the air and easily ll the
pipes), closes the air vent valve.
If the piping from the pump to the nozzles is already lled,
then only the pump and its outlet valve will resume operation.
If the outside temperature drops to a preset point (adjustable
by the user, set to 6oC by default), the system stops and
drains the pipes from the pump’s outlet valve to the air vent
valve, to avoid freeze damage to the pipes, nozzles and air
vent valve. The system will not restart until the temperature
reaches a preset point (adjustable by the user, set to 10oC
by default).
If there is no demand during a predetermined period
(adjustable by the user, set to three days by default ), the
controller drains the same pipe section to avoid bacterial
growth.
The system is also equipped with a water treatment system
which includes a water particle lter, a demineralizer (anti-
scale) and a UV light.
WATER INLET LOW PRESSURE SWITCH (LPS) OR
LOW LEVEL SWITCH (LLS)
IMPORTANT: In the event of a water shortage, the
controller stops the adiabatic system and triggers an
alarm. For this alarm to take place, a low pressure switch
(LPS) or a low level switch (LLS) must be installed. This
switch is not provided by RefPlus and must be eld
installed on the inlet pipe if the system uses city water
(LPS) or on a water tank if the system uses a tank or
a receiver (LLS). When using city water, the minimum
inlet pressure must be 40 psi. The low pressure switch
should be adjusted to open below 40 psi. The Dwyer
A1PS-34 switch is an appropriate switch model.
The system will not restart if the condition persists. Also, it
determines, by reading the pressure drop across the lter
of the water treatment system, if it needs to be replaced. It
monitors the pump outlet pressure and stops the system if
it increases to an abnormal level (with modulating pump). It
allows the user to set service alarms for the water particle
lter, demineralizer, UV light and pump oil (if modulating
pump is used).
The software can adjust the behaviour of the system using
two main congurations: Pulsing Valve or Modulating Pump.
For the sake of simplicity, they are often called PV and MP,
respectively, in this manual. Some parameters are only used
for one of these congurations. They are labeled “only for
PV” or “only for MP”, as needed.
COOLING DEMAND
The cooling demand is the percentage of the temperature
range reached by the temperature reading.
Example:
Setpoint = 28oC
Band = 5oC
Temperature range = 28oC to 33oC
Temperature reading = 31oC
Cooling demand = 60% (as demonstrated in Graph 1)
In this example, the cooling demand is 60%, since it is the
value on the Y axis that corresponds to the temperature
reading on the X axis (Graph 1).
0%
27oC 28oC29oC30oC31oC32oC 33oC 34oC
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
CD
TEMP.
Graph 1 Cooling Demand
The temperature reading used for determining the cooling
demand depends on the setting ‘’Control by’’, which can be
set to Fluid Temperature or Outside Temperature under the
System Specications sub-menu (see page 17).
SYSTEM SELECTION: PULSING VALVE
If the Pulsing Valve has been set (see page 17), two
control options are available, either Ladder or Scaler.
The Scaler and Ladder methods allow the user to congure
a ratio between the pulse length and the cooling demand
(in %) as well as between the pulse length and the outside
temperature (OT).
With the Scaler method, when the cooling demand varies
ever so slightly (i.e. from 10% to 11%), the pulse length will
vary instantly.

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When using the Ladder method, when the cooling
demand varies, the pulse length remains the same within
predetermined cooling demand ranges (i.e. 0%-20%). When
the cooling demand reaches the next range (i.e.20%-40%),
the pulse length then changes.
For both methods, the pulse lengths can also be inuenced
by the outside temperature (OT). This allows the system to
use less water when OT is low. The user must rst set a
low outside temperature (OutTempLW) and a high outside
temperature (OutTempLW + OutTempLW band). Then, the
user can set a low outside temperature pulse length (LOT)
and a high outside temperature pulse length (HOT) for each
cooling demand percentage.
LOT = Pulse length when outside temperature is equal or
below OutTempLW.
HOT = Pulse length when outside temperature is equal or
above OutTempLW + OutTempLW band.
PER = Period of pulsing valve open-close cycle
OutTempLW = Outside temperature when the pulse lengths
are shortest.
OutTempLW + OutTempLW band = Outside temperature
when the pulse lengths are longest.
Also, the user must choose between Proportional and
Range:
Proportional: The pulses will be shorter as OT approaches
OutTempLW and longer as OT approaches OutTempLW +
OutTempLW band.
Range: When OT is equal or below OutTempLW, the
pulses will be shorter (LOT). When OT is equal or above
OutTempLW + OutTempLW band, the pulses will be longer
(HOT). When OT is between OutTempLW and OutTempLW
+ OutTempLW band, the pulses will remain the same; this
means if OT rises and passes OutTempLW, shorter pulses
are still used, and If OT drops and passes OutTempLW +
OutTempLW band, longer pulses are still used.
SCALER
The next two screens show an example of a Scaler
conguration.
SYSTEM SPECIFICATIONS
Pulse length: Scaler
PumpON when CD is: 010%
OutTempLW: 22.0C
OutTempLW band: 05.0C
OutTempLW mode: Prop
Screen A
SYSTEM SPECS (SCALER)
Demand:
0%
020%
040%
060%
080%
100%
LOT HOT PER
006-010/060s
006-010/060s
017 -
022/060s
028- 034/060s
039- 047/060s
050- 060/060s
Screen B
In this example, the OutTempLW is set to 22oC, which
corresponds to the low outside temperature point where
the shortest pulses (LOT) will be applied, depending on
the cooling demand (left column on Screen B). Here, the
OutTempLW band is set to 5oC, this means the high outside
temperature point (OutTempLW + OutTempLW band)
is equal to 27oC, where the longest pulses (HOT) will be
applied, depending on the cooling demand (left column on
Screen B).
The cooling demand is expressed in % as shown in Graph 1.
For each percentage, there is an associated pulse length
range in seconds, as shown on Screen B. For example, for
a 20% cooling demand, the pulse length LOT is 6 seconds
and HOT is 10 seconds. Then the pulse length range is 6-10
seconds.
The next three graphs represent the settings shown on
Screen A and Screen B.
0% 20% 40% 60% 80% 100%
0
6
10
10
20
30
40
50
22
34
47
60
17
28
39
50
PULSE LENGTH RANGE (SECONDS)
COOLING DEMAND
60
HOT
LOT
Pulse length variation depending on OT
Cooling demand (CD) changes pulse length
Graph 2 Pulse length range vs cooling demand (according to
parameters on screen B)

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21oC22oC23oC 24oC 25oC 26oC27oC
6
7
8
9
10
PULSE LENGTH (SECONDS)
OUTSIDE TEMPERATURE
LOT
HOT
OutTempLW
OutTempLW + OutTempLW band
RANGE MODE PROP MODE
Graph 3 Pulse length vs outside temperature (cooling demand
at 20%) (according to parameters on screens A and B).
The higher the OT, the longer the pulse for the same
cooling demand.
21oC22oC23oC 24oC 25oC 26oC27oC
28
29.5
31
32.5
34
PULSE LENGTH (SECONDS)
OUTSIDE TEMPERATURE
LOT
HOT
OutTempLW OutTempLW + OutTempLW band
RANGE PROP
Graph 4 Pulse length vs outside temperature (cooling demand
at 60%) (according to parameters on screens A and B).
The higher the OT, the longer the pulse for the same
cooling demand.
MODE SET TO PROP: According to Graph 2 and Graph 3,
if the cooling demand is 20%, the pulse length will be from 6
to 10 seconds. If the outside temperature is 22oC or below,
the pulse length will be 6 seconds (LOT). If the outside
temperature is 27oC or above, the pulse length will be 10
seconds (HOT). If the outside temperature is anywhere
between 22oC and 27oC, the pulse length will be proportional
within the corresponding 6-10 sec. range.
As another example, according to Graph 2 and Graph 4, if
the cooling demand is 60%, the pulse length will be from 28
to 34 seconds. If the outside temperature is 22oC or below,
the pulse length will be 28 seconds (LOT). If the outside
temperature is 27oC or above, the pulse length will be 34
seconds (HOT). If the outside temperature is anywhere
between 22oC and 27oC, the pulse length will be proportional
within the corresponding 28-34 sec. range.
MODE SET TO RANGE: According to Graph 2 and Graph 3,
if the cooling demand is 20%, the pulse length will be either 6
or 10 seconds. If the outside temperature is 22oC or below, the
pulse length will be 6 seconds (LOT). If the outside temperature
is 27oC or above, the pulse length will be 10 seconds (HOT). If
OT rises and passes 22oC, the pulse remains at 6 seconds. If
OT drops and passes 27oC, the pulse remains at 10 seconds.
According to Graph 2 and Graph 4, if the cooling demand is
60%, the pulse length will be either 28 or 34 seconds. If the
outside temperature is 22oC or below, the pulse length will
be 28 seconds (LOT). If the outside temperature is 27oC or
above, the pulse length will be 34 seconds (HOT). If OT rises
and passes 22oC, the pulse remains at 28 seconds. If OT
drops and passes 27oC, the pulse remains at 34 seconds.
NOTE: In these Proportional and Range examples, pulse
lengths are over a 60-sec. period (PER), which is adjustable
by the user.
Screen C is shown when Scaler is set. No parameters
can be modied here. It shows the resulting pulse lengths
according to the cooling demand percentages that were set
(in our example).
Pulse
008/060s
008 /060s
020 /060s
031/060s
043
/060s
055 /060s
SYSTEM SPECS (SCALER)
Demand:
0%
020%
040%
060%
080%
100%
Screen C
LADDER
Screen D and Screen E show an example of a Ladder
conguration.
SYSTEM SPECIFICATIONS
Pulse length: Ladder
PumpON when CD is: 010%
OutTempLW: 22.0C
OutTempLW band: 05.0C
OutTempLW mode: Prop
Screen D
SYSTEM SPECS (LADDER)
Demand:
0%-020%
020%-040%
040%-060%
060%-080%
080%-100%
100%
LOT HOT PER
006-010/060s
014 - 020/060s
023- 030/060s
032- 040/060s
041 - 050/060s
050- 060/060s
Screen E
In this example, the OutTempLW is set to 22oC, which
corresponds to the low outside temperature point where
the shortest pulses (LOT) will be applied, depending on
the cooling demand (left column on Screen E). Since the
OutTempLW band is set to 5oC, then the high outside

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temperature point (OutTempLW + OutTempLW band) is
equal to 27oC, where the longest pulses (HOT) will be
applied, depending on the cooling demand (left column on
Screen E).
The cooling demand is expressed in % as shown in Graph
1. For each percentage range, there is an associated pulse
length range in seconds, as shown on Screen E. For example,
for a 0 to 20% cooling demand, the pulse length LOT is 6
seconds and HOT is 10 seconds. Then the associated pulse
length range is 6-10 seconds.
The next three graphs represent the settings as shown on
Screen D and Screen E.
0% 20% 40% 60% 80% 100%
0
6
10
10
20
30
40
50
20
30
40
60
50
14
23
32
50
41
PULSE LENGTH RANGE (SECONDS)
COOLING DEMAND
60
HOT
LOT
Pulse length variation depending on OT
Cooling demand (CD) changes pulse length
Graph 5 Pulse length range vs cooling demand (according to
parameters on Screen E)
21oC22oC23oC 24oC 25oC 26oC27oC
6
7
8
9
10
PULSE LENGTH (SECONDS)
OUTSIDE TEMPERATURE
LOT
HOT
OutTempLW OutTempLW + OutTempLW band
RANGE MODE PROP MODE
Graph 6 Pulse length vs outside temperature (cooling demand
from 0 to 20%) (according to parameters on Screen D
and Screen E). The higher the OT, the longer the pulse
for the same cooling demand range.
21oC22oC23oC 24oC 25oC 26oC27oC
14
15.5
17
18.5
20
PULSE LENGTH (SECONDS)
OUTSIDE TEMPERATURE
LOT
HOT
OutTempLW
OutTempLW + OutTempLW band
RANGE PROP
Graph 7 Pulse length vs outside temperature (cooling demand
from 20-40%). (according to parameters on Screen D
and Screen E) The higher the OT, the longer the pulse
for the same cooling demand range.
MODE SET TO PROP: According to Graph 5 and Graph 6,
if the cooling demand is from 0 to 20%, the pulse length will
be from 6 to 10 seconds. If the outside temperature is 22oC
or below, the pulse length will be 6 seconds (LOT). If the
outside temperature is 27oC or above, the pulse length will
be 10 seconds (HOT). If the outside temperature is anywhere
between 22oC and 27oC, the pulse length will be proportional
within the corresponding 6-10 sec. range.
As another example, according to Graph 5 and Graph 7,
if the cooling demand is from 20 to 40%, the pulse length
will be from 14 to 20 seconds. If the outside temperature is
22oC or below, the pulse length will be 14 seconds (LOT). If
the outside temp. is 27oC or above, the pulse length will be
20 seconds (HOT). If the outside temperature is within the
22oC-27oC range, the pulse length will be proportional within
the corresponding 14-20 sec. range.
MODE SET TO RANGE: According to Graph 5 and Graph
6, if the cooling demand is from 0 to 20%, the pulse length
will be either 6 or 10 seconds. If the outside temperature is
22oC or below, the pulse length will be 6 seconds (LOT). If
the outside temp. is 27oC or above, the pulse length will be
10 seconds (HOT). If OT rises and passes 22oC, the pulse
remains at 6 seconds. If OT drops and passes 27oC, the
pulse remains at 10 seconds.
According to Graph 5 and Graph 7, if the cooling demand
is from 20 to 40%, the pulse length will be either 14 or 20
seconds. If the outside temperature is 22oC or below, the
pulse length will be 14 seconds (LOT). If the outside temp.
is 27oC or above, the pulse length will be 20 seconds (HOT).
If OT rises and passes 22oC, pulse remains at 14 seconds.
If OT drops and passes 27oC, pulse remains at 20 seconds.
NOTE: In these Proportional and Range examples, pulse
lengths are over a 60-sec. period (PER), which is adjustable
by the user.
Screen F is shown when Ladder is set. No parameters
can be modied here. It shows the resulting pulse lengths
according to the cooling demand percentages that were set
(in our example).

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SYSTEM SPECS (LADDER)
Demand:
0%-020%
020%-040%
040%-060%
060%-080%
080%-100%
100%
Pulse
006/060s
014/060s
023 /060s
032 /060s
041 /060s
050 /060s
Screen F
SYSTEM SELECTION: MODULATING PUMP
If Modulating Pump has been set as the system selection
(see page 17), the controller allows the user to congure
a ratio between the pump speed and the cooling demand
(in %) as well as between the pump speed and the outside
temperature (OT).
When the cooling demand varies, the pump speed will vary
proportionally.
The pump speed can also be inuenced by the outside
temperature (OT). This allows the system to use less
water when OT is low. The user must rst set a low outside
temperature (OutTempLW) and a high outside temperature
(OutTempLW + OutTempLW band). Then, the user can
set a minimum and maximum pump speed for low outside
temperature (LOT) and a minimum and maximum pump
speed for high outside temperature (HOT).
LOT = Low Outside Temperature = OutTempLW
HOT = High Outside Temperature = OutTempLW +
OutTempLW band
OutTempLW = Outside temperature when the pump
follows the cooling demand at lower speeds (from min to
max speed for LOT).
OutTempLW + OutTempLW band = Outside temperature
when the pump follows the cooling demand at higher speeds
(from min to max speed for HOT).
Also, the user must choose between Proportional and
Range:
Proportional: The pump speed will be lower as OT approaches
OutTempLW and higher as OT approaches OutTempLW +
OutTempLW band, following the cooling demand.
Range: When OT is equal or below OutTempLW (LOT), the
pump will run at lower speeds, following the cooling demand.
When OT is equal or above OutTempLW + OutTempLW
band (HOT), the pump will run at higher speeds, following
the cooling demand. When OT is between OutTempLW
and OutTempLW + OutTempLW band, the pump speed
will remain the same; this means if OT rises and passes
OutTempLW, pump continues to run at low speeds, and If
OT drops and passes OutTempLW + OutTempLW band,
pump continues to run at high speeds.
Screen G and Screen H show an example of a Modulating
Pump conguration.
SYSTEM SPECIFICATIONS
PumpON when CD is: 010%
OutTempLW: 22.0
o
C
OutTempLW band: 05.0
o
C
OutTempLW Mode: Prop
Screen G
SYSTEM SPECIFICATIONS
Water pump
LOT HOT RES
Max spd:
072-082% 072%
Min spd: 040-050% 040%
Acceleration
on start: 01%/sec
Screen H
In this example, the OutTempLW is set to 22oC, which
corresponds to the low outside temperature point where the
pump will run at lower speeds (LOT column on Screen H),
depending on the cooling demand. Since the OutTempLW
band is set to 5oC, then the high outside temperature point
(OutTempLW + OutTempLW band) is equal to 27oC, where
the pump will run at higher speeds (HOT column on Screen
H), depending on the cooling demand. Column RES on
Screen H shows the resulting minimum and maximum
speeds depending on OT.
The cooling demand is expressed in % as shown in Graph
1 on page 5. For each cooling demand percentage,
there is an associated pump speed range in %, as shown
on Graph 8. For example, for a 100% cooling demand, the
pump speed is 72% at low outside temperature and 82% at
high outside temperature.
The next three graphs represent the settings as shown on
Screen G and Screen H.
0% 20% 40% 60% 80% 100%
0%
10%
PUMP SPEED
COOLING DEMAND
20%
30%
40%
50%
60%
70%
80%
82 Max spd (HOT)
72 Max spd (LOT)
50 Min spd (HOT)
40 Min spd (LOT)
90%
100%
Pump speed variation depending on OT
Cooling demand (CD) changes the pump speed
Graph 8 Pump speed range vs cooling demand (according to
parameters on Screen H)

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21oC22oC23oC 24oC 25oC 26oC27oC
40%
50%
45%
PUMP SPEED
OUTSIDE TEMPERATURE
LOT
HOT
OutTempLW OutTempLW + OutTempLW band
RANGE MODE PROP MODE
Graph 9 Pump speed vs outside temperature (cooling demand at
0%) (according to parameters on Screen G and Screen
H).
The higher the OT, the higher the pump speed for
the same cooling demand.
21oC22oC23oC 24oC 25oC 26oC27oC
72%
82%
77%
PUMP SPEED
OUTSIDE TEMPERATURE
LOT
HOT
OutTempLW OutTempLW + OutTempLW band
RANGE MODE PROP MODE
Graph 10 Pump speed vs outside temperature (cooling demand
at 100%) (according to parameters on Screen G and
Screen H
). The higher the OT, the higher the pump
speed for the same cooling demand.
MODE SET TO PROP: According to Graph 8 and Graph 9,
if the cooling demand is 0%, the pump speed will be from
40 to 50%. If the outside temperature is 22oC or below, the
pump speed will be 40% (LOT). If the outside temp is 27oC
or above, the pump speed will be 50% (HOT). If the outside
temperature is anywhere between 22oC and 27oC, the pump
speed will be proportional within the corresponding 40-50%
range.
As another example, according to Graph 8 and Graph 10, if
the cooling demand is 100%, the pump speed will be from 72
to 82%. If outside temperature is 22oC or below, the pump
speed will be 72% (LOT). If the outside temperature is 27oC
or above, the pump speed will be 82% (HOT). If the outside
temperature is within the 22oC-27oC range, the pump speed
will be proportional within the corresponding 72-82% range.
MODE SET TO RANGE: According to Graph 8 and Graph 9,
if the cooling demand is 0%, the pump speed will be either
40 or 50%. If the outside temperature is 22oC or below, the
pump speed will be 40% (LOT). If the outside temperature
is 27oC or above, the pump speed will be 50% (HOT). If OT
rises and passes 22oC, the pump speed remains at 40%.
If OT drops and passes 27oC, the pump speed remains at
50%.
According to Graph 8 and Graph 10, if the cooling demand
is 100%, the pump speed will be either 72 or 82%. If the
outside temperature is 22oC or below, the pump speed will
be 72% (LOT). If the outside temperature is 27oC or above,
the pump speed will be 82% (HOT). If OT rises and passes
22oC, the pump speed remains at 72%. If OT drops and
passes 27oC, the pump speed remains at 82%.
ACCELERATION ON START:
Except when pipes are drained, the pump will always start
at its minimum speed. It will then gradually increase to the
speed dened by the cooling demand. The acceleration
ramp can be set using this parameter. Only for Modulating
Pump (MP).
If the pipes are drained, the pump starts at full speed to ll the
pipes. Then, pump speed drops to minimum and gradually
increases to the speed dened by the cooling demand.

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StatuS anD programming menu & Sub-menuS Diagram
PROGRAMMING MENU
G>VERSION INFO
A>UNIT ON/OFF
B>USER SETUP
ENTER USER PASSWORD
0000
UNIT STATUS
ON
000sec(s)
ENTER USER PASSWORD
0000
ENTER SERVICE PASSWORD
0000
OFFSETS
Outside temp: 00.0
o
c
010.0
o
c
Fluid temp: 00.0
o
c
024.7
o
c
SERVICE ALARMS TIME:
Pump oil: 02000hrs
UV lights: 08000hrs
Filter: 08000hrs
Demineralizer: 00300hrs
Minimum off: 072hrs
ENTER FACTORY PASSWORD
0000
FACTORY SETUP MENU
ALARMS LOGGING RESET
SYSTEM SPECIFICATIONS
DIGITAL INPUTS/OUTPUTS
16 : 47 : 48 2021/05/05
SP:
Band:
Pump. Pump valve.
Air vent val.
Pump: 079%
Drain valve. OT: 010.0
Water treat. FT: 031.3
028.0
07.0
003:Obstr water filter
CLOCK SETTING
Clock Mode: 24h
17:06:03 2020/09/08
Set new hour 17:06
Set new date 20/09/08
yy/mm/dd
A) UNIT ON/OFF B) USER SETUP C) SERVICE MENU
D) FACTORY SETUP
FACTORY SETUP SUB-MENUS
PROGRAMMING MENUS
E) ALARM HISTORY
F) CLOCK G) VERSION INFO
SYSTEM
SPECS
DIGITAL
INPUTS DELAYS
FEATURES/ALARMS
ENABLE/DISABLE
FACTORY
RESET
DEVICES
RUN HOURS
GENERAL
STATUS
ALARMS
LOG. RESET
SYSTEM SPECIFICATIONS
SYSTEM SPECIFICATIONS
Water pump
LOT HOT RES
Max spd:
072-082% 072%
Min spd: 040-050% 040%
Acceleration
on start: 01%/sec
Pulses length: Scaler
PumpON when CD is: 010%
OutTempLW: 22.0
o
C
OutTempLW band: 05.0
o
C
OutTempLW Mode: Prop
ENABLE ALARMS?
Change pump oil: NO
Ch. water filter: YES
Change UV lights: YES
Ck. demineralizer: YES
FACTORY RESET
This will factory
reset the unit.
Are you sure?
Reset
DEVICES RUN HOURS
Are you sure to reset
this device RUN HOURS
registry?
Choose device
Save each: 12hour(s)
Seconds per hour: 3600
Are you sure to reset
the alarms logging?
Reset
TIME SINCE LAST
MAINTENANCE
Water filter: 00000hrs
UV lights:
00000hrs
Demineralizer: 00000hrs
Water pump:
000hs
Water filter: 000hs
UV lights:
000hs
Demineralizer: 000hs
TIME SINCE LAST
MAINTENANCE
Water pump: 00000hrs
Water filter: 00000hrs
UV lights:
00000hrs
Demineralizer: 00000hrs
DEVICES RUN HOURS
Reset alarm?
Restart water pump?
Water low pressure
alarm.
Water inlet low
pressure switch
activated.
Digital Input 1
Signal from interlock
Active if Status
CLOSED CLOSED
Digital Input 2
Water Inlet switch
Active if Status
OPEN CLOSED
Delay time= 005secs.
Digital Input B5
Diff. pressure switch
Active if Status
OPEN CLOSED
Delay time= 030secs.
Digital Input B6
Water pump disch. sw.
Active if Status
CLOSED OPEN
Delay time= 03secs.
16 : 47 : 48 2020/05/05
Status:OFF OT: 010.0
o
C
CD:000% FT: 024.7
o
C
Pump status: OFF
Pulsing valve: CLOSED
Air vent valve: OPEN
Drain valve: OPEN
Water treatment: OFF
ALARMS LOGGING RESET
SYSTEM SPECIFICATIONS
PLAN:01
System selection:
Pulsing valve
Control by:
Fluid temperature
CONTROLLER SETUP
MENUS
by REFPLUS 20072114
VERS 1.4
ADIABATIC
TEMPERATURE SETUP
Setpoint band:
Drain temp. band:
07.0
o
c
04.0
o
c
SETPOINT
DRAIN TEMP.:
28.0
o
c
06.0
o
c
RUN HOURS RESET
This will reset the
RUN HOURS since last
maintenance.
Choose device
TEMPERATURE UNIT
Celcius
MAIN PAGE RETURN DELAY
02Min(s).
TEMPERATURE SETUP
Modulating Pump
Pulsing Valve
STATUS SCREENS ALARM MENU
16 : 47 : 48 2020/05/05
Status:OFF OT: 010.0
o
C
CD:000% FT: 024.7
o
C
Pump status: OFF
Pulsing valve: CLOSED
Air vent valve: OPEN
Drain valve: OPEN
Water treatment: OFF
16 : 47 : 48 2020/05/05
Status:OFF OT: 010.0
o
C
CD:000% FT: 024.7
o
C
Pump speed: 000%
Pump valve: CLOSED
Air vent valve: OPEN
Drain valve: OPEN
Water treatment: OFF
PULSING VALVE-CONTROLLED MONDULATING PUMP
CONTROLLED
MONDULATING PUMP
CONTROLLED
PULSING VALVE-CONTROLLED
SYSTEM SPECS (LADDER)
Demand:
0%-020%
020%-040%
040%-060%
060%-080%
080%-100%
100%
LOT HOT PER
006-010/060s
014 - 020/060s
023- 030/060s
032- 040/060s
041 - 050/060s
050- 060/060s
SYSTEM SPECS (LADDER)
Demand:
0%-020%
020%-040%
040%-060%
060%-080%
080%-100%
100%
Pulse
006/060s
014 /060s
023 /060s
032 /060s
041 /060s
050 /060s
Pulse
008/060s
008/060s
020 /060s
031/060s
043 /060s
055 /060s
SYSTEM SPECS (SCALER)
Demand:
0%
020%
040%
060%
080%
100%
COMMUNICATION SETTINGS
BMS address:001
Protocol:CAREL Local
Baudrate: 19200 baud
SYSTEM SPECS (SCALER)
Demand:
0%
020%
040%
060%
080%
100%
LOT HOT PER
006-010/060s
014 - 020/060s
023- 030/060s
032- 040/060s
041 - 050/060s
050- 060/060s
DELAYS
ON/OFF: 015secs
Fact. pass. enab: 10mins
Drain if no dem: 0072hs
Air vent valve: 030secs
Set 0.23S per feet of
5/8” pipe & 3.1 GPM.

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VERSION INFO
To view the software version installed on the controller:
1. Enter the Programming menu by pressing . The display will read:
PROGRAMMING MENU
G>VERSION INFO
A>UNIT ON/OFF
B>USER SETUP
2. Use to scroll the Programming menu and select G) VERSION INFO
3. Press . The screen will display the software version installed on the controller. In this case, the version is 1.4
by REFPLUS 20072114
VERS 1.4
ADIABATIC
menuS & parameterS

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STATUS MENU (SYSTEM STATUS & RUN HOURS)
When the controller is powered ON, it shows screen 1 of the Status menu. The Status menu has 3 screens. Each one shows
important information regarding the status of the controller and the adiabatic system, such as time and date, controller status
(ON/OFF), operating time, etc. No data can be entered or modied in the Status menu. The Status menu will show
default screens until the controller has been setup in the Programming menu.
STATUS SCREEN 1
Time
Controller Status ON/OFF
Status of water pump3(only for PV)
Cooling Demand1
Outdoor Temperature2
Fluid Temperature2
Date
16 : 47 : 48 2020/05/05
Status:OFF OT: 010.0oC
CD:000% FT: 024.7oC
Pump status: OFF
Pulsing valve: CLOSED
Air vent valve: OPEN
Drain valve: OPEN
Water treatment: OFF
Status of pulsing valve4(only for PV)
Status of air vent
Status of drain valve
Status of UV light
1Indicates the cooling demand depending on the fluid temperature (or on outdoor temperature if set).
2An arrow pointing this line indicates the system is being controlled by this temperature.
3Indicates pump speed when operating with modulating pump.
4Indicates pump outlet valve status when operating with modulating pump.
Press to access Status screen 2.
TIME SINCE LAST
MAINTENANCE
Water filter: 00000hrs
UV lights:
00000hrs
Demineralizer: 00000hrs
Status screen 2 shows the operating time of the four main devices since the last maintenance:
• Water pump: pump operating time since last oil change (only for MP).
• Water lter: lter operating time since last change.
• UV lights: ultraviolet lights operating time since last change.
• Demineralizer: demineralizer operating time since last maintenance.
Press to access Status screen 3.
Water pump: 000hs
Water filter: 000hs
UV lights:
000hs
Demineralizer: 000hs
DEVICES RUN HOURS
Status screen 3 shows the total operating time of the four main devices.

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FACTORY RESET PROCEDURE
This procedure will reset the controller to factory settings. It is carried out at the factory before the controller is shipped.
WARNING! The following step will clear your settings and restore those of the factory. DO NOT perform this
operation unless you want to return to the factory settings.
Note to RefPlus factory technician: Always carry out this procedure before setting up the controller.
Note to eld technician: If this procedure is carried out, controller must be set-up according to your own specications.
1. Enter the Programming menu by pressing . The display will read:
PROGRAMMING MENU
G>VERSION INFO
A>UNIT ON/OFF
B>USER SETUP
2. Use to scroll the Programming menu and select D) FACTORY SETUP
3. Press . The display will read:
ENTER FACTORY PASSWORD
0000
The screen may prompt you to enter the factory password. Please contact RefPlus to obtain your factory password.
4. Press .
5. Use t o enter the factory password. Note: If password is not accepted, verify that date and time are set properly.
See page 30 for Clock Adjustment
6. Press to conrm the password. The display will read:
FACTORY SETUP MENU
ALARMS LOGGING RESET
SYSTEM SPECIFICATIONS
DIGITAL INPUTS/OUTPUTS
7. Use to select FACTORY RESET.
8. Press .The display will read:

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FACTORY RESET
This will factory
reset the unit.
Are you sure?
Reset
9. Press and then to carry out the factory reset.

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SETTING UP YOUR CONTROLLER USING THE PROGRAMMING MENU
Use the Programming menu to make the initial setup of your Guardian+ Adiabatic Controller or to modify a parameter. In this
section, you will enter parameters in the following sections:
1. FACTORY SETUP
2. USER SETUP
3. SERVICE SETUP
4. CLOCK
1. FACTORY SETUP
1. Enter the Programming menu by pressing . The display will read:
PROGRAMMING MENU
G>VERSION INFO
A>UNIT ON/OFF
B>USER SETUP
2. Use to scroll the Programming menu and select D) FACTORY SETUP.
3. Press . The display will read:
ENTER FACTORY PASSWORD
0000
The screen may prompt you to enter the factory password. Please contact RefPlus to obtain your factory password.
4. Press .
5. Use to enter the factory password. Note: If password is not accepted, verify that date and time are set
properly. See page 30 for Clock Adjustment.
6. Press to conrm the password. The display will read:
FACTORY SETUP MENU
ALARMS LOGGING RESET
SYSTEM SPECIFICATIONS
DIGITAL INPUTS

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7. Use to select SYSTEM SPECIFICATIONS and then press to conrm your selection.
The display will read:
SYSTEM SPECIFICATIONS
PLAN:01
System selection:
Pulsing valve
Control by:
Fluid temperature
P-LAN indicates the controller’s P-LAN address.
8. Press .
9. Using , set the system selection, either Pulsing Valve or Modulating Pump.
Pulsing Valve: This is the main and most common system selection. It uses a single-speed centrifugal pump and
the amount of water delivered to the nozzles is controlled by a pulsing valve. Refer to Operation Principle
on page 5.
Modulating Pump: Uses a variable speed pump to change the water ow. Refer to Operation Principle on page 9.
10. Press to conrm your selection.
11. Using , set the method with which the system will be controlled, either according to the uid temperature or
the outside temperature. An arrow pointing to the uid temperature reading (FT) or to the outside temperature reading
(OT) on the main screen is shown, depending on the selected control method.
Fluid temperature: The cooling demand (CD) is based on the uid temperature (FT); the amount of water delivered
to the nozzles is then proportional to the uid temperature (the probe is usually installed on the
cooler coil outlet). The controller also considers outside temperature to determine the amount of
water that must be delivered to the nozzles. Refer to the Operation Principle on page 5.
Outside temperature: The cooling demand (CD) is based on the outside temperature (OT). The amount of water
delivered to the nozzles is then proportional to the outside temperature. Refer to the Operation
Principle on page 5.
12. Press to conrm your selection.
13. Press , the display will read:
SYSTEM SPECIFICATIONS
Pulses length: Scaler
PumpON when CD is: 010%
OutTempLW: 22.0
o
C
OutTempLW band: 05.0
o
C
OutTempLW Mode: Prop
If Pulsing Valve was previously selected, the Pulses length parameter is shown, so follow steps 14 and 15. If Modulating
Pump was selected, continue to step 16 on page 18.
14. Press .
15. Using , select either Scaler or Ladder.
Refer to the Operation Principle on page 6 to page 8 for information regarding the Scaler and Ladder methods.

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PumpON when CD is: A minimum cooling demand can be set to prevent the pump from cycling. The pump will only start if
there is a demand from the unit (cooler or condenser) and if the minimum cooling demand (PumpON when CD) has been
reached. The pump will stop if the demand from the unit no longer exists or if the cooling demand drops to 0%. Refer to the
Operation Principle on page 5 for more information on the cooling demand.
16. Press .
17. Use to set the minimum cooling demand (PumpON when CD).
18. Press .
19. Use to set the OutTempLW.
20. Press .
21. Use to set the OutTempLW band.
22. Press .
23. Use to set the OutTempLW Mode, then press to conrm.
Refer to the Operation Principle on page 6 for more information regarding parameters OutTempLW, OutTempLW
band and OutTempLW Mode.
24. Press .
If system is set to Pulsing Valve and Ladder, continue to step 28.
If system is set to Modulating Pump, continue to step 32.
If system is set to Pulsing Valve and Scaler, the display will read:
SYSTEM SPECS (SCALER)
Demand:
0%
020%
040%
060%
080%
100%
LOT HOT PER
006-010/060s
006-010/060s
017 -
022/060s
028- 034/060s
039- 047/060s
050- 060/060s
25. Press and use to adjust these parameters as desired. Refer to the Operation Principle on page 6 for
more information on the Scaler method.
26. Press until the cursor is back at the upper left corner of the screen. Press , the display will read:
Pulse
008/060s
008 /060s
020 /060s
031/060s
043
/060s
055 /060s
SYSTEM SPECS (SCALER)
Demand:
0%
020%
040%
060%
080%
100%
No parameters can be modied here. It shows the resulting pulse lengths according to the cooling demand percentages that
were set in step 25 as well as according to parameters OutTempLW,OutTempLW band and OutTempLW Mode.
27. Continue to step 35.

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28. If the system is set to Pulsing valve and Ladder, the display will read:
SYSTEM SPECS (LADDER)
Demand:
0%-020%
020%-040%
040%-060%
060%-080%
080%-100%
100%
LOT HOT PER
006-010/060s
014 - 020/060s
023- 030/060s
032- 040/060s
041 - 050/060s
050- 060/060s
29. Press and use to adjust these parameters as desired. Refer to the Operation Principle on page 7 for
more information on the Ladder method.
30. Press until the cursor is back at the upper left corner of the screen. Press , the display will read:
SYSTEM SPECS (LADDER)
Demand:
0%-020%
020%-040%
040%-060%
060%-080%
080%-100%
100%
Pulse
006/060s
014/060s
023 /060s
032 /060s
041 /060s
050 /060s
No parameters can be modied here. It shows the resulting pulse lengths according to the cooling demand percentage
ranges that were set in step 29 as well as according to parameters OutTempLW,OutTempLW band and OutTempLW
Mode.
31. Continue to step 35.
32. If the system is set to Modulating Pump, the display will read:
SYSTEM SPECIFICATIONS
Water pump
LOT HOT RES
Max spd: 072-082% 072%
Min spd: 040-050% 040%
Acceleration
on start: 01%/sec
Refer to the Operation Principle section for more information on the cooling demand (page 5), pump speed adjustment
and acceleration on start (page 9).
33. Use to navigate between elds. Use to enter the values. Press to conrm your selection.
34. Press until the cursor is back at the upper left corner of the screen.
35. Press , the display will read:

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COMMUNICATION SETTINGS
BMS address:001
Protocol:CAREL Local
Baudrate: 19200 baud
36. Press .
37. Use to enter the BMS address, the controller’s address in a supervisory system. Press to conrm.
38. Use to enter the BMS port communication protocol. Set CAREL Local for pCOWEB and BACNET cards; set
MODBUS Slave for MODBUS card. Press to conrm.
39. Use to select the communication Speed for the BMS1 port. Choose between 1200, 2400, 4800, 9600 or
19200 baud. Press to conrm.
40. Press to return to the FACTORY SETUP MENU. The display will read:
FACTORY SETUP MENU
ALARMS LOGGING RESET
SYSTEM SPECIFICATIONS
DIGITAL INPUTS
41. Use to select DIGITAL INPUTS
42. Press to conrm your selection. The display will read:
Digital Input 1
Signal from interlock
Active if Status
CLOSED CLOSED
The purpose of the digital inputs is to run the system, trigger alarms, protect the system, change settings, and others. A
digital input may have several elds such as Name, Active if, Status, Delay, etc.
Name: if the name is displayed, the digital input is enabled. When disabled, the actions related to the input will not be taken.
Active if: OPEN or CLOSED can be set. It allows to set the input for both, normally open or normally closed switches.
Status: digital input status, CLOSED or OPEN. When the status is the same than the “Active if” condition (means the input
is active), the actions for the input are taken.
Delay: the actions for the input will be taken when the input status has been the same than the “Active if” condition during
the time set by “Delay”.
Digital input 1 (Signal from interlock, ID1): signal from the cooler calling for the adiabatic system to run.
43. Press and use to set Signal from interlock.