GE Hangwei Medical Systems: Modular Cooling System
GE Hangwei Medical Systems: Modular Cooling System
GE Hangwei Medical Systems: Modular Cooling System
GE Part # 5344803
Lytron Part # MCS7627G1
Introduction ............................................................................................................................................. 3
General Information............................................................................................................................... 3
Service Hotline
Lytron has a 24-hour per day, 7 day per week service hotline to help you with questions on the startup and
operation of your MCS. (We recommend you review the trouble shooting guide) before calling our service
hotline. Lytron USA service can be reached by dialing +1-781-933-7300 . To facilitate your call please have the
model number and serial number (located on rear of the unit) of the unit for the Lytron Service Technician.
- Identifies the port where heated fluid returning from the customer’s
RETURN TO
machine is connected.
COOLING SYSTEM
Product Specifications
Watts 6,000
Cooling Capacity
Btu/Hr 20,500
Inlet (Barb) 1”
Fluid Connections
Outlet (Barb) 1”
The MCS7627G1 is a liquid-to-air type cooling system designed to pump ambient temperature liquid from the
MCS’s reservoir tank through the end user’s heat source, though the MCS’s radiator, and back to the reservoir tank
(see Appendix A for internal plumbing schematic). The external plumbing and the heat source are provided buy the
end. A typical cooling loop can be seen in Figure 1.
Lytron Heat
MCS Source
STEP 8: "DRAIN-DOWN"
After the level has become stable (while still continuously jogging on and off), turn the pump off and observe the
coolant level. If the level remains the same, all is well. However, if the level slowly begins to rise, it means
coolant at a higher level is draining back down into the reservoir.
In this event, turn the pump back on again to return the tank to a steady level. Raise the MCS to a higher
position, to see if this will temporarily correct the problem.
This "drain-down" problem can be permanently corrected by (1) either installing a shutoff valve in the return line
(either manual or automatic); or (2) by using a non-vented cap on the reservoir (during shutdown only).
STEP 9: "ON-LINE"
Your MCS Cooling System is now ready for full-time use.
It has been designed for reliable service on a CONTINUOUS OPERATIONAL DUTY CYCLE.
Routine system maintenance should be very minimal once the MCS Cooling System has been initially installed,
filled, primed and is up and running. Maintenance instructions for changing and maintaining coolant level not
covered in the installation and operating instructions will be covered here under SYSTEM MAINTENANCE.
Operating experience with each unique equipment installation will dictate reasonable frequency of system
inspections and/or scheduled maintenance. Suggested guidelines are presented under the following Sections
(B), (C) and (E).
Leakage: The weekly visual check does not require removal of the top cover. However, observation of coolant
on the floor surface, coming out from under the system, calls for a further check for possible new leaks.
Coolant Level: Any significant drop in the coolant level on the front panel since the previous weekly check
should be investigated further. If there is no visual system leak, then the loss may be due to leakage elsewhere
in the equipment. See Section (D) for instructions on "topping up" the reservoir.
Pump and Fan Assemblies: With upwards of 10,000 hours continuous duty life expectancy on the pump and
20,000 hours on the fan, both of these components should check OK, on a week-after-week basis.
Heat Exchanger: The fins of the heat exchanger(s) provide the surface area for heat transfer to occur. Dust
buildup will inhibit adequate heat transfer, so removal of dust from the fin area will help maintain efficiency of the
system. Use a fine haired brush or vacuum to remove any dust from the heat exchanger. This should be done
on a monthly basis.
Coolant Temperature: With no temperature monitor in the system, checking each week by placing a hand on
top of the cover, will determine if relative operating temperature level is consistently the same as the week
before (normal temp level checks OK). Any substantial increase in temperature level should be further
investigated (i.e., airflow obstruction, filter blockage).
• Remove top cover and right panel (from front of system); remove cap from reservoir.
• Add coolant into the reservoir, up to the FULL mark on the front panel.
Drain Coolant from System: The system is best drained using a wet-vac. First vacuum all of the water out of
the tank. Once the tank has been emptied, disconnect the supply and return lines one at a time and using the
wet-vac to vacuum water out of the lines.
Reconnect Hoses: Reconnect system coolant supply and return hoses, making sure the hose clamps are on
tight. Also check any other equipment lines that may have been disconnected for draining.
Reconnect Power Plug: Plug should be reapplied with electrical power to the plug OFF. Once energized, the
green indicator light on the front panel of the system will illuminate.
CAUTION: PUMP WILL BE DAMAGED IF RUN DRY. If pump starts, quickly check to make sure
system power to the unit is OFF (fan not running), before proceeding. Also check level switch for "hang-up."
Coolant Refill: Now perform Steps 4, 6 & 7 of the previous Installation and Operational Instructions for initial
refilling procedure.
Restart Cooling System: After the coolant level has become stable for several minutes and has been topped
off again to the FULL mark, the system can now be turned on again to full operation.
Replace System Cover: Before replacing the system covers, carefully recheck a final time for any new leaks.
Shipping conditions are not a controlled environment; temperatures during winter months may well be much
lower than the operation and storage conditions as specified. To prevent freeze-up during shipment, the
following observations and special instructions should be noted.
From the Factory: The MCS cooling system is shipped dry from the factory.
After Initial Filling: For any subsequent shipments anytime after the unit has once been filled for operations,
the following applies:
• Drain the Cooling System using normal draining procedures found in Maintenance Section (E). The system
reservoir will be drained empty during this procedure.
CAUTION: THE UNIT MUST BE COMPLETELY DRAINED AND DRY TO PREVENT FREEZING
DURING LOW TEMPERATURE SHIPPING.
Improper voltage to the system. Verify and correct the voltage to the unit.
Pump motor
overheats Shut down unit, clear obstructions and
Obstruction in pump head.
restart unit.
Low coolant level or no coolant in the Check for leaks. Repair any leaks and fill
reservoir. reservoir.
Restriction in coolant lines external to the Eliminate restrictions in the lines. Open
Low coolant flow unit. any valves.
Turn unit off. Wait for overload to cool. It
Pump overload has tripped.
will reset on its own in 30 minutes or less.
Leaks in external piping. Repair leaks.
Pressure drop through system is too Reduce line length or increase line
Supply pressure is large. diameter.
too high Adjust gate valve until desired pressure is
Gate valve is not open enough.
achieved.
Remove obstruction. Ref. Step 3 in
Fan obstruction
Installation Instructions.
All 4 fans are not operating. Replace faulty fan.
Pump is not delivering adequate flow. To
check the pump’s performance, close the
Diminished system flow control valve on the pump discharge
Replace pump.
performance port and verify that the pressure gauge
reads a minimum of 53 psig for 60 Hz or
36 psig for 50 Hz.
Service Assistance If, after following these trouble shooting steps, your unit fails to operate properly, contact Lytron for
assistance.
5 11
10
6
Figure 3: Casters, Pressure Gauge, & Pump Figure 4: Level Switch & Heat Exchangers
16 17 14 15
13
12
Figure 5: Fans, Finger Guard, Relay, Circuit Breaker, Motor Starter, & Phase Reverse
Lytron’s cooling systems are the product of over 50 years of thermal engineering and
manufacturing experience. We designed them to provide superior reliability, easy
maintenance, and worry-free operation. However, occasionally a system may need repair.
To ensure your process is back up and running quickly, Lytron has implemented the
following cooling system service policy.
Diagnostic Consultation:
At no cost, Lytron will attempt to diagnose the problem over the phone. Our service department can be
reached by calling 781-933-7305 and following the menu or contacting one of our regional Service-
Depots. Service technicians are available 24 hours/7 days for consultation. Lytron strongly
encourages customers to take advantage of this service before returning a cooling system to Lytron for
evaluation. Often a problem with a system can be fixed quickly in-house or it is determined that it is an
application problem. By utilizing our service hotline, you can avoid the downtime and expense
associated with returning the system to our factory. Phone diagnosis can be difficult and may actually
be a trial and error process. Lytron will not assume any liability for misdiagnosis when diagnosing
over the phone.
A credit card or, for existing customers, a purchase order, (PO), is also required for the
evaluation and repair charges if Lytron determines the system is not defective as defined by the
warranty (see below for more details). The amount suggested will cover the evaluation fee and
most repair charges for non-warranty repairs.
The RMA number should be indicated on the outside packaging of the returned unit. Systems must be
returned clean, dry, and free from chemicals to Lytron’s factory, shipping costs prepaid. Lytron is not
responsible for any damage incurred in the return shipment. Coolant disposal fees may apply for
returned units. Please contact your service representative for details.
Debit memos should not be issued for any repair, either warranty nor non-warranty repairs.
Lytron ordinarily will evaluate the unit within 2 or 3 business days of receipt. Lytron will use
reasonable effort to repair the unit promptly, in most cases within one week of receiving all of the
required parts. Lytron’s warranty covers repair of the unit but Lytron’s warranty does not cover
cosmetic issues. If upon examination Lytron determines the system has not failed as defined by the
warranty, an evaluation fee will be charged. The evaluation fee will be charged regardless of
Repair warranty:
Lytron warranties the replacement parts and labor for 90 days from the repair date under the
terms of our standard warranty or the balance of the original warranty, whichever is longer.
Return Shipments:
Lytron’s warranty covers payment for standard, ground return shipment of warranted repairs. The
incremental price difference for expedited return shipments, if requested, are the responsibility of the
customer. After non-warranty repair, Lytron will ship the system back using the customer’s preferred
shipping method.
All requests for On-Site Services require a PO or credit card authorization before services will be
scheduled.
When using Lytron-arranged, on-site service, Lytron warranties the replacement parts and repair labor
for 90 days from the repair date under the terms of our standard warranty or for the balance of the
original warranty, whichever is longer. If non-authorized labor repairs the system or installs
replacement parts, Lytron does not warranty the parts or work and this action potentially voids any
remaining warranty.
Lytron is expanding its worldwide service presence. Please contact the Service Department for the
latest areas where on-site service is available.
Replacement Parts:
Replacement parts can be ordered using a credit card or purchase order. Parts being returned from
systems under warranty should be returned using a Lytron issued RMA number. If the parts are found
to be defective and the claim is within the warranty period, credit will be issued for the price of the
parts and one-way ground shipping charges. If the parts are not defective or indicate end user
damage, no credit will be issued. Lytron will not cover the incremental cost of air shipment of
replacement parts, regardless of warranty status.
In-stock parts will normally ship the next business day; non-stocked parts will be shipped as quickly as
reasonably possible.
This policy is subject to change. Please check with Lytron’s service department for the current
policy.
Description: The heat exchanger ‘fins’ should be checked during normal planned maintenance and
cleaned as required.
Symptoms: When used in an environment with dust and debris it is possible for the heat exchangers
in the Modular Cooling System to become blocked with dust. This will lead to a reduction of airflow
across the cooling fins thereby reducing the cooling capacity.
Tools Required:
• Philips Screwdriver (#2)
• Small soft-bristle brush (2” or 5cm paint brush)
• Rag or towel
• Large sheet of paper or piece of cardboard to catch debris
• Dust pan or Vacuum
WARNING: Disconnect power before servicing the unit. Follow all Lock-out/Tag-out procedures.
CAUTION: The copper ‘fins’ of the heat exchanger are very sharp. Use care when working near
the heat exchanger.
Procedure:
1. Disconnect power from the MCS
2. Remove top and side covers to expose the heat exchanger.
3. Place rag or towel over tank cap.
4. Place sheet of paper over the tank and pump to protect them from debris. Figure 1.
5. Using soft bristle brush, gently sweep in the direction of the fin. Start sweeping from top and
move toward bottom of heat exchanger. Figure 1.
End of procedure.