MRC Rova-M-C3 Operation instructions

User’s Operating Manual
Recirculating Cooler
Rova-M-C3
3, Hagavish st. Israel 58817 Tel: [phone], Fax: [phone]
[email protected]
MRC.4.21

Congratulations!
You have made an excellent choice!
First of all, MRC thanks you for the trust you have placed. This operating
manual has been designed to help you gain an understanding the principles of
operating and possibilities of our bath liquid circulation unit. For optimum utilization
of all functions, we recommend that you thoroughly study this manual prior to
beginning operation.
Safety Warnings
1) Take care your unit is operated only by qualified persons.
2) Make sure you read and understand all instructions and safety precautions
listed in this manual before installing or operating your unit. If you have any
questions of your unit or the information in this manual, contact MRC.
3) Performance of installation, operation, or maintenance procedures other
than those described in this manual may result in a hazardous situation
and may void the manufacturer's warranty.
4) Transport the unit with care. Sudden jolts or drops may cause damages in
the interior of the unit.
5) Observe all warning labels.
6) Never remove warning labels.
7) Never operate damaged or leaking equipment.
8) Never operate the unit without bath fluid in the bath.
9) Always turn off the unit and disconnect the mains cable from the power
supply before performing any service or maintenance procedures, or
before moving the unit.
10) Always empty the bath before moving the unit.
11) Never operate equipment with damaged mains power cables.
12) Refer service and repairs to a qualified technician.
Because of upgrade of productions, the contents of the operating manual may
have some differences between the newest production you buy, please consult the
on-the-spot service people when you operate the unit for the first time. In your
afterwards operation, please contact with us in time if there is any question, we will
serve you sincerely. In addition, owing to editor’s limited level, defections may not
be avoided. Those constructive suggestions are welcome.

Table of Contents
Chapter I System Introduction................................................................................- 1 -
Chapter II Installation Instruction...........................................................................- 2 -
Chapter III User’s Guide............................................................................................- 4 -
3.1 Preparations before Operation.................................................................... - 4 -
3.2 Controller Panel............................................................................................... - 5 -
3.3 Operation Guide...............................................................................................- 7 -
3.3.1 Switching on........................................................................................... - 7 -
3.3.2 Setting the Setpoint Temperature..................................................... - 7 -
3.3.3 Start/Stop Compressor........................................................................ - 9 -
3.3.4 Start/Stop Pump.................................................................................. - 10 -
3.3.5 PID Adjustment.................................................................................... - 10 -
3.3.6 Switching off.........................................................................................- 11 -
3.4 Advanced Application Mode....................................................................... - 11 -
3.5 Common Alarms............................................................................................ - 13 -
3.6 Hardware Port (Optional).............................................................................- 15 -
Chapter IV Trouble Shooting Guide....................................................................... - 16 -
Appendix I Parameter Database...........................................................................- 17 -
Appendix II Warning Information......................................................................... - 21 -

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Chapter I System Introduction
The recirculating cooler, also called as chiller, draws heat from bath liquid via the
cooling system for instruments or equipments that need to be cooled (Water is a
common bath liquid, synthetic bath liquid, such as glycol water is used for lower
temperature) to ensure instruments or equipments to work properly under the
regular temperature. A close medium circulation is formed between the unit and
the instrument depending on the pump’s pressure inside the unit, and the
temperature sensor detects the medium temperature to realize the control of the
cooler.
The recirculating cooler is applied vastly for a variety of laboratory test
equipments such as rotary evaporators, X-ray diffractometer, ICP emission
spectrometer, ICP-MS, graphite furnace atomic absorption spectrometer,
ED-XRF, electron microscope, medical CT, medical physiotherapy unit,
production test unit, precision grinder, computer numerical control machine,
machining center, laser equipment etc.
This cooler is an integral unit with parts such as condenser, compressor,
evaporator and pump inside the same case.

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Chapter II Installation Instruction
The recirculating cooler shall be equipped indoor with good environment. The
principles of choosing the location as following:
Location Principle
1
Firm ground or experiment table in a dust-free and cool
environment with good ventilation
2
Far from droplets or steam
3
Far from the location that influx, viscous flow, leak of fuel gas may
happen
4
Far from high frequency devices such as high frequency welding
machine
5
Far from the location where acidic solutions used frequently
6
Far from the location where special sprayer (sulfide contained)
used frequently
As for convenience and safety of maintenance and installation, space between
the indoor unit and obstacles should be ensured.
Ensure the measurements during indoor installation:
1）The distance between the bath top and top obstacles shall be at least 300mm;
2）The distance between two bath sides and obstacles shall be at least 500mm;
3）The distance between bath back and obstacles shall be at least 500mm;
4）The distance between bath front and obstacles shall be at least 1000mm;
The following picture shows the space requirements for installation:
(Measurement unit: mm)

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Unit installation:
Unpack the unit and check the packing list to ensure accessories to be complete.
Please contact with our sales services for solutions when there is a shortage.
Move the unit from the wooden packing base to spacious position and check for
damages incurred during transit. Push the unit to the installation position after
confirmation and ensure it is stable and safe, then install the external circulating
loop pipelines.
Attention
Please ensure correct collection of the external circulating water
loop (That is, the water outlet of the unit should be connected to
the water inlet pipe of the instrument needs to be cooled; the
return pipe of the instrument should be connected to the water
inlet ).
Please pay attention to joint leakage after injection of the
bath liquid. If leakage happens, please deal with it in time.

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Chapter III User’s Guide
3.1 Preparations before operation
1. Please clean the water tank and workspace before operation.
2. Make sure the flange bolts of the external flexible hose tightened.
3. Power connection: connect the chiller’s power outlet with the single phase
power of the workspace (please referring to duty plate of the unit). The
requirement of the power supply shall be grounded single phase three
wire, whose earth resistance shall not be bigger than 0.1Ω. Electric power
supply of single unit shall be at least 10 Ampere.
4. Bath liquid injection: bath liquid should be injected for the first time
operation. It will be better the injection volume over the water level switch
10 to 20mm. To avoid blockage and incrustation in pipelines, please use
deionized water or dedicated bath liquid. It is necessary for you to clean
the water tank and change the bath liquid in water tank regularly to
prevent germs.
5. Automatic feed inlet is used to connect with user’s bath liquid supply
system to realize automatic fluid supplement without supervision. User
can voluntarily connect the inlet with bath liquid supply system via
standard pipeline. Automatic feed inlet system starts in a low water level
state with alarm generated. If user’s instrument has already connected
with the external bath liquid supply, the automatic fluid supplement
process will automatically start. The process will automatically delay 10
seconds to stop after reach the water level.
Remark 1：Bath liquid shall be injected as soon as the orifice unit starts,
which should be slowly injected with funnel diameter no less than
300mm, and stop injection after water level alarm stops.
Remark 2：Different temperature range should apply for corresponding
bath liquid. Reference as following:
Glycol water or alcohol is applied commonly when working temperature
is under 5℃.
Deionized water is applied usually when working temperature is between
5℃and 80℃.
15% Glycerin solution is applied commonly when temperature range is

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between 80℃and 90℃.
Silicone oil is applied commonly when temperature range over 90℃.
Warning
Bath liquid over 35℃should not be directly cooled via
cryogenic circulator. That is, the compressor could not start
when the temperature of the bath is over 35℃.
3.2 Controller Panel
Above is the picture of the unit’s controller panel:
There are two 4-digit LED displays. The following one is main display, the Top
one is the auxiliary display. The former usually shows real-time temperature, the
latter shows target temperature or alarm code and some other related
information.
The digital display tube shows and their meanings as following:

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There are 8 keys on the controller panel, which are Pump key , Menu
key , Left-shift key , Add key , Reduce key , Esc key , Enter
key and Start/Stop key .
There four indicators function as following:
Warning
indicator
Red light flashes
Low water level alarm. No water flow alarm.
Protection delay alarm. High temperature
and low temperature alarm
Cooling
indicator
Green light
Cooling system working indicator
Heating
indicator
Yellow light
Heating system working indicator (heating
function is usually customized by user).
Standard unit is not available of the
function. This indicator only lights on when
heating function is available.
Pump
indicator
Blue light
Water circulation system working indicator

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3.3 Operation guide
3.3.1 Switching on
1. Turn on the leakage protector.
2. Turn on the power switch. Then the unit begins to initializing interface.
When initializing finished, the unit enters standby mode with a buzzer
beep;
3. Press Start/Stop key. Check the fluctuation of the outlet pressure gauge
and the vibration of the pump.
Attention
In case of abnormal noise when pump works, please stop
immediately and check; if pump can not start with power
on, please cut the power at once and check to remove the
faults.
3.3.2 Setting temperature
There are two temperature setting modes: menu set and direct set. Users
can set the temperature by operating the Add key and Reduce key

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directly or Menu key indirectly.
1. Single-point high precision mode:
This mode is to control the water temperature of the bath in a constant value
T00 via PID algorithm. The unit under this mode can also work under the
Start/Stop economic mode by setting R_CS and R_CM parameters (please
refer to Part 3.4 for details).
Remark: In advanced application mode, set 0 as R_CS parameter, 2 as
R_CM parameter to change to single-point high precision mode.
Usually it is not necessary for users to change. It is invalid for
start-stop type unit.
Press Menu key under working interface, then the auxiliary display
shows T00, and the main display shows setting temperature. Press Add key
to add or Reduce key to reduce the value of the corresponding
point. Press Left-shift key to change the point of the display. After
reached the value, please press Enter key to save the value. The
value won’t be saved if press Esc key to return back to the working
interface.
2. Start/Stop economic mode
This mode controls the start/stop of the compressor by setting two kinds of
temperatures (objective control temperature T00 and control precision T01).
When the water temperature of the bath is higher than T00+T01, the
compressor starts to cooling , and it stops until the temperature lower than
T00-T01. This circulation controls the temperature value between T00-T01
and T00+T01. If set T00=20℃and T01=5℃, then the unit will control the
temperature between 15℃and 25℃; when the water temperature is higher

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than 25℃, the compressor starts to cooling, and the auxiliary display shows
the objective cooling temperature as 15 ℃; when the water temperature is
lower than 15 ℃, the compressor stops to cooling, at the same time the
auxiliary display shows the temperature upper limit as 25℃.
Remark: In advanced application mode, it is upper and lower economic
control mode to set 0 as R_CS parameter, 1 as R_CM parameter. Usually
it is not necessary for users to change.
Press Menu key under working interface, then the auxiliary display
shows T00, and the main display shows setting temperature. After
parameters set, press Enter key to save and press Menu key
enter into temperature control precision setting, now the auxiliary display
shows T01(temperature control precision), the main display shows the
precision of the temperature difference control, which can be set by Left-shift
key , Add key and Reduce key .
Remark: Units with Start/Stop economic temperature control mode can
not working under single-point high precision temperature control
mode by setting R_CS and R_CM parameter.
3. Tracking control mode:
In this mode, the water temperature in the bath can be controlled via adding
another temperature sensor by configuration of the sensors’ port of the unit.
This temperature sensor can sense the temperature of the environment or
user’s equipments. Please refer to Part 3.4 for detailed setting method.
Remark: Ordinary chillers are not available of tracking temperature
control mode function, it is optional for customers.
3.3.3 Start/Stop compressor

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Press Start/Stop key under working interface. The pump operation
indicator is on. The auxiliary display shows the compressor protection
countdown. After countdown finished, the compressor begin to run, and the
auxiliary display shows the target temperature., and the cooling indicator will
indicate cooling state according to the computing result of the PID modifier.
Press Start/Stop key to stop operation during unit operation, and the
unit enters into standby mode.
In normal operation state, the auxiliary display on the control panel shows the
target temperature, the main display shows the current temperature value of
the circulation liquid.
3.3.4 Start/Stop pump
The pump indicator is off state when pump does not work. Press Pump key
to start, the pump indicator lights on. During pump is working, pump
operation indicator is always on state until the pump stops.
Remark: In the unit working state, the pump will continue working to
provide bath liquid circulation, it is invalid to stop the pump by pressing
the Pump key .
3.3.5 PID Adjustment
When medium circulator works under different temperatures, the control
parameters are slightly different if cooling power is different. When
connecting with different loading units, the control parameters are usually
different. PID parameters can be adjusted via circulators for much more
precise temperature control.
Adjustment process: First set the target temperature then press Start/Stop
key . Long press Enter key until the auxiliary display shows the
adjusting objective and adjusting state alternatively. At this moment, users
need not do any operation. When adjustment finished, the system will quit
automatically and enter into operating state. If users want to quit the
adjusting state, long press Esc key , then the unit back to operating
state.
Remark: The adjusting time is different from different unit with different

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adjusting temperature. Ordinarily it is about 15 to 20 minutes.
3.3.6 Switching off
1. Press Start/Stop key to stop the compressor, the system enters
into standby state, then press Pump key to turn off then pump.
2. Switch off the power supply of the control panel;
3. Please turn off the electric leakage protection and power supply switch,
empty and dry the water tank and pump for long time outage;
4. After long time usage, the pump should be opened to check and change
the worn-out parts when water flow and pressure decrease obviously;
5. Please ensure no water in the unit (especially in the pump and plate heat
exchanger) when the environment temperature is under 0 ℃. Residual
water will freeze and do damage to parts such as the pump, heat
exchanger and pipes. It is suggestive to use antifreeze as circulating
medium for long time operation and outage in low temperature
environment.
3.4 Advanced application mode
Long press Menu key over 3 seconds into advanced application mode.
The main LED digital display shows four flashing slashes prompting for code,
press Add key and Reduce key to input data, press Left-shift
key to move the input location, press Enter key to enter into
parameter set mode after finished inputting code. Different parameter set
interface can be loaded with inputting different code.
Take setting operation model base as an example in the following text (The
other parameter database setting method is similar, please refer to Appendix

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I for details).
1) Input code 0022 to enter into operation model base. The first interface: the
auxiliary display shows R_AM, which is the code for automatic start with
power on; the main display shows setting parameter, 0 stands for automatic
start, 1 for manual start, 2 for remote control switch, 3 for remote
communication control. Press Add key and Reduce key to
change set value, press Left-shift key to change the current location,
press Enter key to save current setting value and enter into next
parameter set process, press Esc to quit current set and back to the
work interface, press Menu key to quit without saving setting value and
enter into next parameter set interface.
Remark: Start automatic control, cooling temperature control mode will
process automatically with power on; stop automatic control, cooling
temperature control mode can realize by pressing Start/Stop key .
2) The second interface: the auxiliary display shows R_CM, the temperature
control mode code; the main display shows optional parameters of the
temperature control mode, 1 stands for upper and lower limit, 2 stands for
single point high precision temperature control; the set method is ditto.
3) The third interface: the auxiliary display shows R_CS, the main display show
temperature control setting parameter, 0 stands for set mode, 1 stands for
tracking mode. Press Menu key to enter into next interface, use Add
key and Reduce key to change the parameters.
4) The fourth interface: the auxiliary display shows R_MS, the main display
shows the parameter option of the main sensor port, 1 stands for sensor port
one, 2 for sensor port two and 3 for sensor port three; the set method is ditto.
5) The fifth interface: the auxiliary display shows R_SS, the main display shows
the port option of the auxiliary sensor; the alternation method is ditto.
6) The sixth interface: the auxiliary display shows R-LO, the main display shows
keyboard lock options. If choose YES, in three minutes under work state, at
the bottom right of the main display, the decimal point begins to flash, when

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the keyboard locks; long press Esc to quit lock state; Choose NO to
disable the function.
7) The seventh interface: the auxiliary display shows R_RS, the main display
shows NO or YES, this parameter can restore factory default setting; the set
method is ditto.
8) The eighth interface: the auxiliary display shows R_VE, the main display
shows the software version number.
9) The ninth interface: the auxiliary display and the main display both show
_END, which means the end of parameter set.
3.5 Common alarms
■Start-up delay alarm: E_DL
The unit will not enter into cooling state until the delay protection time is full
after power on. It is three minutes start-up delay time. In power-on state,
when the period between two times of the compressor starts to operate is
longer than start-up delay protection time, the compressor starts to cool as
soon as the unit starts. The start-up delay alarm functions when pressing
compressor Start/Stop key before start-up delay protection time fulfils in
power-on state. At this moment, the main display shows E_DL, alarm
indicator flashes and no alarm sound; when start-up delay protection time is
full, the compressor starts automatically with alarm lifted.
■Low water level alarm: E_LS
When the water level is lower than the evaporator, the water level alarm
functions with buzzer beeps, at the same time the water inlet valve opens
automatically, the user’s external water circulation begins to import water. In
standby state, the compressor won’t start when press the compressor
Start/Stop key, it will return to normal after water fulfilled. In work state, low
water level alarm functions for water level shortage, it can be lifted by adding
water or pressing Compressor Start/Stop key to stop the compressor. When
water level alarm functions with buzzer beeps, and the auxiliary display

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shows E_LW.
Remark: To protect cooling unit, please switch off it before check.
■Low water flow alarm: E_LF
In working state, when the water flow amount is lower than the valve (not all
the units available of flow valve, it is optional for customers), the water flow
alarm functions with buzzer beeps and the auxiliary display shows E-LF. At
this moment, please check whether the pump starts or not. If pump not
started, the alarm can be lifted by starting the pump; if it is not the reason,
which indicates that there is a failure in the pump or water circuit is blocked,
please check the water system. At this moment please press Start/Stop key
of the compressor to stop it to lift the alarm and check.
Remark: To protect cooling unit, please switch off it before check.
■Over temperature limit alarm: E_H1、E_H2
In work state, when the water temperature is higher than the setting high
temperature limit, the over temperature limit alarm functions with buzzer
beeps, the auxiliary display shows E_H1. At this moment, the alarm can be
lifted either by waiting for the automatic temperature control system of the
unit to cool, or just pressing Start/Stop key of the compressor to stop it. After
it, you can check the system.

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Remark 1: To protect cooling unit, please switch off it before check.
Remark 2: The compressor can not be started when the temperature of
the circulation liquid is higher than the temperature of compressor
protection.
■Under temperature limit alarm: E_L1、E_L2
In work state, when the water temperature is lower than the setting low
temperature, the under temperature limit alarm will function with buzzer
beeps, and the auxiliary display shows E_L1. At this moment, the alarm can
be lifted either by waiting for the automatic temperature control system of
the unit to heat up, or just pressing Start/Stop key of the compressor to stop.
After it, you can check the system.
Remark: More details about alarms information please refer to
Appendix II.
3.6 Hardware Port (Optional)
The hardware port provides normally open contact signal of the relay to
user’s instrument, whose load capacity is 0.3A/125VAC or 0.3A/110VDC or
1A/30VDC. In which water level alarm signal, water flow alarm signal and
temperature alarm signal can be output. This port on the back of the unit
output signals via 12-pin or 7 pin aviation plug.

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The definition of the 12 pins of the
aviation plug:
Pin 1 & 2: water flow signal output,
which function with normal water
flow and disconnect with abnormal
water flow.
Pin 3 & 4: water level signal output,
which function with normal water
level and disconnect with abnormal water level.
Pin 5 & 6: temperature signal output 1, it is customized.
Pin 7 & 8: temperature signal output 2, it is customized.
Pin 9: control input (+) port for receiving of contact signals or level
signals (15mA/the resistance provided by the client side). Start the unit
with high level or when connected, stop the unit with low level or when
disconnected.
Pin 10: control input (-) port.
Pin 11 & 12：reservation.
Chapter IV Trouble Shooting Guide
Phenomenon: the unit starts with the power supply switch indicator not on
and pump not working for the first time operation;
Possible reason and solution:
Reason: air break switch on the power supply incoming end is OFF state.
Solution: turn ON the air break switch.
Phenomenon: The pump can not work or work properly with the Pump
indicator on but buzzer beeps.
Possible reason and solution:
Reason: it is difficult to start the pump because of a lot of air or dirt in the
pump or long time outage causing the lubrication decrease of the rotor.
Solution: Cut off the power supply, open the cover board of the unit and
pull out the rubber gasket, rotate the rotor for a while by a straight

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screwdriver, then the pump can be restarted properly.
Attention: Different unit may apply for different pump type, the method
above may be not always applicable.
Phenomenon: water level alarm indicator flashes and buzzer beeps.
Possible reason and solution:
a) Reason: water shortage in the water tank, low water level.
Solution: add water until water level above the fluid level switch.
b) Reason: fluid level switch short or damage.
Solution: change the fluid level switch.
Phenomenon: water flow alarm indicator flashes with buzzer beeps
Possible reason and solution:
a) Reason: the pump is not started;
Solution: press Pump key to start;
b) Reason: water circuit leaks;
Solution: check the water circuit;
c) Reason: pump damage;
Solution: change the pump.
Appendix I Parameter Database
Temperature set menu: no code, directly press Menu key to enter;
Item
Parameter
Meaning
Option or
Range
Initial
data
Objective
temperature
T_00
Setting the target
temperature
(Start/Stop type，PID)
C_SL ~C_SH
20
Temperature
deviation
T_01
Setting control
precision
(Start/Stop type)
0.01 ~ 9.99
5
Tracking
temperature
T_11
Setting deviation
temperature
(tracking mode)
-99.9～99.9
-2
Operation mode database: code: 0022, long press Menu key to enter with code;