Laird MRC 150 User manual

Doc#: 60-70-004
Revision: 07
MRC 150/300
Thermoelectric Re-circulating
Liquid Chiller
User’s Manual
USA: +1 888.246.9050
Europe: +44.1342.315044
Asia: +886.3.312.9292
Website: www.lairdtech.com •Email: clv[email protected]

Doc#: 60-70-004
User’s Manual Revision: 07
Page 2
USA: +1 888.246.9050 Europe: +44.1342.315044 Asia: +886.3.312.9292
www.lairdtech.com •clv[email protected]
Table of Contents
1. .......................................................................................... 2Introduction
2. ............................................................................. 2Incoming Inspection
3. ................................................................................... 3Product Handling
4. ......................................................................... 3Technical specifications
5. ................................................ 8Installation and Operation Instructions
6. .............................................................. 9Recommended Fluid Couplings
7. ................................................................................... 9Digital Controller
8. ........................................................................ 11Troubleshooting Guide
9. ....................................................................................... 12Serviceability
10. .......................................................................................... 12Warranty
11. ............................................................................. 13Return Procedure
1. Introduction
Laird Technologies’ solid-state recirculating liquid chillers are designed to provide
cooling for a wide range of water solutions, and can be used for cooling in many
medical, laser, and test laboratory applications. They are intended to work in
“closed loop” systems that separate the coolant from the outside environment,
protecting the purity of the cooled product.
This manual provides the necessary general information for proper installation
and operation and has been developed to achieve the best results when using the
Laird Technologies chiller.
2. Incoming Inspection
Laird Technologies’ chiller units are designed, built, and packaged to withstand
the shock and vibration normally associated with shipment by common carriers.
Occasionally, improper handling during shipment, such as excessive vibration,
crushing, etc., will cause damage to the product. Therefore, a thorough
inspection should be provided upon receipt of all shipments. Any packaging
tears, dents, scratches, or loose objects are signs of damage and should be noted
on the Freight Bill. Packages should be opened promptly and units inspected for
concealed damage. If damage is found, an immediate claim must be filed
with the freight carrier and an inspection requested. Retain all packing
materials. Laird Technologies cannot be responsible for Consignee’s failure to file
a timely freight claim.

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3. Product Handling
Do not operate this unit before reading this manual.
Before operating Laird Technologies’ recirculating liquid chiller, be certain
that:
1. the unit is positioned vertically.
2. the liquid reservoir and entire recirculating system are filled with
coolant.
3. the air inlet and outlet are at least 12” away from any restrictions.
WARNING
Electrical Shock Hazard
A. DO NOT OPERATE UNIT WITHOUT COOLANT IN THE SYSTEM.
B. ENSURE THAT THERE IS A CIRCUIT BREAKER ON THE LINE AND
THAT IT COMPLIES WITH NAMEPLATE RATING.
C. PLUG UNIT INTO GROUNDED ELECTRICAL OUTLET ONLY.
D. IF THE ELECTRICAL SUPPLY CORD IS DAMAGED, IT MUST BE
REPLACED BY A CORD WITH AN EQUAL OR HIGHER RATING.
Failure to follow the above precautions could result in electrical shock, fire, personal
injury, or damage to the unit, and will void the warranty.
4. Technical specifications
Standard Features
Programmable Digital Temperature Controller
Low and High Temperature Alarm Signals
Low Fluid Level Indicator
Fluid inlet and outlet quick disconnect, 3/8” flow female valves (see
section 7 for recommended system male connectors)
MRC general series specifications
Input voltage, VAC 115-230VAC
Operating environment temperature range, °C (°F)14.4 to 45 (40 to 113)
Control temperature range, distilled H2O as coolant,
°C (°F)22 to 40 (35 to 104)
Control temperature range, using 75% distilled H2O
and 25% glycol or alcohol as coolant, °C (°F)2
-12 to 40
(10.4 to 104)
Controller accuracy, °C ± 0.16
Frequency, Hz 50/60
1For ambient conditions outside this range, please contact Laird Technologies.
2For temperature settings below 2°C, an appropriate coolant must be used.

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User’s Manual
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Chiller model MRC 150 MRC 300
Cooling capacity, Watt
(BTU/hr)3149 (508) 290 (990)
Current, Amperes,
115VAC (230VAC) 4.7 (2.4) 8.5 (4.3)
Input power, Watts 294 507
Fluid capacity, mL (oz.) 250 (8.4) 450 (15.2)
Dimensions, h×w×d,
cm (inches)
30.4×19.5×35.1
(12.0×7.7×13.8)
39.1×20.3×33.8
(15.4×8.0×13.3)
Weight, kg (lbs) 10.9 (24) 13.6 (30)
Maximum flow rate,
LPM (GPM)42.9 (0.76) 3.3 (0.87)
3Capacity rating is given at a temperature of 25°C (77°F) for the ambient air and exiting
fluid.
4For more information, see pump capacity charts.
Model Number Nomenclature
MRC300 ____ - __ - DV _____
Recirculating
Chiller
Digital Controller, accuracy ±0.16°C
DH2 = with RS232 serial communication
DH4
= with RS485 serial communication
Cord set options
A = 115 VAC (North American)
N = 230 VAC (North American)
E = 230 VAC
(
Euro
p
ean
)
HT = Heating Option
Capacity
(Watts)

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MRC 150 Performance Charts
Therma
∆T = Outlet Fluid Temperat
-30
-25
-20
-15
-10
-5
0
5
10
15
0 50
Capac
∆T (°C)
100 200 300 400 500 600
Capacity (BTU/hour)
∆T (°F)
l Capacity
ure - Ambient Temperature
100 150 200
ity (Watts)
-54
-45
-36
-27
-18
-9
0
9
18
27
0

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MRC 300 Performance Charts
Thermal Capacity
∆T = Outlet Fluid Temperature - Ambient Temperature
-30
-25
-20
-15
-10
-5
0
5
10
15
0 50 100 150 200 250 300 350 400
Capacity (Watts)
∆T (°C)
-54
-45
-36
-27
-18
-9
0
9
18
27
0 200 400 600 800 1000 1200
Capacity (BTU/hour)
∆T (°F)

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User’s Manual Revision: 07
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5. Installation and Operation Instructions
1. Install Laird Technologies chiller on a level surface capable of supporting
the weight of the Unit. Allow 30 cm (12”) clearance around the air inlet
and discharge areas to insure proper air circulation. If obstacles block the
airflow, the unit may overheat. This reduces performance and can lead to
failure.
2. Fill the reservoir 2/3 full with fluid (see *Notes below).
3. Connect the Unit to an AC power outlet.
4. Connect the Unit to the liquid lines of your system using the input and
output quick connections on the side of the Unit.
5. Turn power switch ON.
6. Watch the reservoir and keep filling as the fluid level drops.
7. Once the reservoir maintains a 1/2 full level, keep the chiller running for
10 seconds before you top off the reservoir.
8. If you turn off the chiller, wait at least 5 minutes before you turn it back
on. Make sure the fluid is circulating in the reservoir, otherwise turn off
the chiller and wait another 5 minutes. (See **Note Below).
9. If there is any doubt that the system has been purged of air, then check
the fluid level and fill reservoir to the top. (If possible, raise the
recirculating system above the chiller reservoir level for a few seconds to
enable air to gather at the highest point. Then bring system below chiller
fluid inlet and outlet connections for a few seconds to allow that air to
travel to the chiller reservoir. If it is not possible to move the system,
move chiller first down, and then up with respect to the system.)
10. Set digital controller to the desired temperature, as shown in Section 7.
11. Run the Unit and check system for possible leaks.
12. The Unit is ready for continuous operation.
*Note 1: For exiting fluid temperature above 2°C (35°F), 100%-distilled water is
recommended as the coolant.
*Note 2: For exiting fluid temperature below 2°C (35°F), a coolant solution of
75%-distilled water and 25%-glycol or alcohol by volume is recommended.
**Note 3: The pump has a delay re-start time of no more than 5 minutes. If the
unit is re-started without a delay, the pump may not function. This delay is a
manufacturer safety factor to reduce the risk potential failures.

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6. Recommended Fluid Couplings
For the fluid line connections, Laird Technologies recommends the following
male couplings.
Unit Tubing Inner Diameter CPC (Colder Products Co.)
Part Number
1/4” PLCD26004
5/16” PLCD26005
MRC 150,
MRC 300 3/8”
PLCD26006*
* A pair of the indicated couplings is included with each chiller unit.
For technical questions about these couplings, or to locate a distributor,
please visit CPC’s website, www.colder.com.
7. Digital Controller
The controller is available with either RS232 or RS485 serial communication
and controls exiting fluid temperature to ±0.16°C. A separate manual from
the controller manufacturer is included with each unit.
1. To display set point Press and hold the »button. The display will now
show the temperature set point and alternately the units (°C or °F).
2. To enter new set point (Factory preset at 10°C) Hold the »button
(displaying set temperature) while pressing either for gto increase or
decrease the set point. While holding the »button, release for gbuttons
to display the new set point. Release the »button and the default display
(actual exiting fluid temperature) will reappear.
3. To adjust other functions of the controller Press fand gtogether for 3
seconds. for gwill scroll through the functions available on that menu level
and pressing either »and ftogether or »and gtogether will change menu
levels. The following table gives some information concerning some of the
common operational functions of the controller. To change functions other
than those shown (recommended for advanced users only), please consult the
separate manual for the controller.

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Function Code Unit
Factory
setting
Available range
of values Recommended range
Set Point N/A °C or
°F 10°-200°C to 400°C
-15°C to 40°C
Set Scale Max
(High Set Point
Limit)
Hi.Sc °C or
°F 40°C 400°C 40°C
Set Scale Min
(Low Set Point
Limit)
Lo.Sc °C or
°F 0°C -200°C 2°C above coolant
freezing point
High Temp.
Alarm1
SP2.A
then
dU.hi
°C or
°F 5°C 400°C Customer defined
Low Temp.
Alarm1
SP2.A
then
dU.lo
°C or
°F -1°C
-200°C Customer defined
Hysteresis1
(Alarm
Differential)
bnd.2 °C or
°F 5°C From 0.1°
to full
scale 1°C to 5°C
Zero
Adjustment
(Sensor Offset)
2Ero °C or
°F Variable
0 to 25% of Full
Scale Customer defined
Select Display
Units Unit °C or
°F oC oC or oF Customer defined
Set point Lock
SP.LK N/A OFF OFF or On Customer defined
Security Lock LoCK N/A nonE nonE,LEU3,
LEU2,ALL Customer defined
1Not available when the heating option is included with the chiller.

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8. Troubleshooting Guide
Problem Possible Reason Corrective Action
Unit will not start, with power
switch turned ON. Controller
display is off and fans are not
spinning.
Power not applied. Check Power supply and ensure
proper voltage in the line.
Unit runs for a period of time
and then shuts OFF.
Controller display turns off
and fans stop spinning.
Line circuit breaker tripped
due to overload.
Ensure line circuit breaker
matches maximum fuse size on
nameplate. Check that there
are no other electrical
components on this line.
1) The heat load is too high.
1) Refer to performance charts
in Section 4. Correct heat load,
if necessary.
2) Controller has incorrect
temperature setting.
2) Correct set point according to
Digital Controller instructions,
Section 7 of this manual.
Unit is running, but does not
maintain desired liquid
temperature.
3) Digital Temperature
Controller is not operating
properly.
3) Consult Factory.
Unit is running, but the Low
Fluid Indicator LED is lit.
Insufficient fluid level in
reservoir.
Fill up reservoir following air
purge instructions, Section 5 of
this manual.
Unit is running, but the liquid
level in reservoir is
decreasing.
Unit or outside System has
a leak.
Check the System for leaks. Fix
if possible. If the leak is
suspected to be within the Unit,
shut the Unit OFF and
disconnect from outlet, then
consult Factory.
1) System coolant line is
clogged.
1) Check outside System coolant
line for clogged tubing, closed
valves, or for a kink in the
tubing.
2) 5 minute restart delay
required.
2) Turn off unit, wait 5 minutes,
then restart. Check for coolant
flow in reservoir.
3) The System head is too
great for the pump.
3) Relieve System pressure by
removing or redesigning flow
restrictions. Consult pump
capacity charts in Section 4.
4) Fluid is frozen in the
Unit.
4) Change the set point to an
appropriate temperature or
change the liquid mixture to
lower the freezing point.
Unit is running, but there is no
coolant flow. Low Fluid
Indicator LED on the front
panel is not lit.
5) The Unit pump is not
running.
5) After checking 1-4 above,
Consult Factory.
Unit still does not run or
perform to specifications. Consult Factory.

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9. Serviceability
No special maintenance is required when using Laird Technologies
Recirculating Liquid Chillers.
For continued optimal performance and extended life of the unit, it is
recommended to clean the heat sinks periodically, using compressed air. If a
unit is not performing properly, use the troubleshooting chart in Section 8 to
find the problem, or consult the factory.
If using any kind of coolant solutions, it is recommended to periodically check
the concentration.
10. Warranty
Laird Technologies Recirculating Chillers adhere to the highest quality
standards and are free from defects in material, components, and
workmanship. This warranty covers repair or replacement of product, to be
done at a Laird Technologies facility, for a period of one (1) year from date of
shipment. Customer is responsible for shipping product to Laird Technologies
freight prepaid. Laird Technologies in turn will return the warranted product
to customer freight prepaid, if within the time period specified above.
Warranty coverage is in effect when the following operating conditions are
continuously satisfied:
Ambient Temperature Range within 4.4°C (40°F) to 45°C (113°F).
Control Temperature Range within 2°C (35°F) to 40°C (104°F) when using
100% water or -12°C (10°F) to 40°C (104°F) with an appropriate coolant.
Line Voltage variation within plus or minus 10% of nameplate rating.
In addition, the following criteria must be met:
Electrical installation and grounding must comply with local electrical and
safety codes.
Recirculating Chiller must be used in the environment for which it is
designed.
Customer cannot abuse or mishandle the product in any way. Any
modifications to the original unit will also void warranty.
Compliance to User’s Manual or any other instructional guide provided by
Laird Technologies for the product.
This warranty does not cover the following:
Applications where product is being misapplied. This includes
inappropriate selection of Liquid Chiller for the environment and conditions in
which it is to be used.

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Damages caused by shipping carrier or any other accident after product
has left Laird Technologies. Shipping claims are the responsibility of the
customer and are to be completed in a timely manner.
Reimbursement of labor for installation or removal of warranted product,
or for parts and labor resulting from repairs performed by any other source
besides Laird Technologies.
This is the complete warranty and is in lieu of any other warranty expressed
or implied, including but not limited to any implied warranty of
merchantability or fitness for a particular purpose. Laird Technologies will in
no way be liable for incidental or consequential damage whatsoever or for any
other claims by the customer for damages in connection with Laird
Technologies products, even if advised in advance of the possibility of such
damage.
11. Return Procedure
All returns must be assigned a Return Materials Authorization number (RMA#)
in advance. Returns received without RMA # may be refused. In the event
that a return is required, the Customer should call Laird Technologies’
Customer Service Department at USA: +1 888.246.9050 Europe:
+44.1342.315044 Asia: +886.3.312.9292 or send an email to
clv.[email protected]. The Customer will be asked to fill out an
RMA form so that RMA # can be issued. All returns must be securely packed
to prevent shipping damage and must be clearly marked with the RMA# on
the box. Consignor shall pay freight charges on all returns.