Lytron MCS50 series Heat Exchanger

Commands | Description | MSDS | NVS parameters | Parts | Planned Maintenance | Procedures | Troubleshooting

Description

On some output devices, heat exchangers are used as a replacement for the Polyscience chillers for cooling thermal 1.7x heads. They are far less complex and more reliable than chillers and use the same pre-mixed coolant that chillers use. A heat exchanger uses ambient temperature air to remove heat from the head's coolant fluid. It consists of a heat exchanger block, a pump, a coolant reservoir, and 3 fans to blow air through the heat exchanger block. Because the heat exchanger runs continuously, there is no need for a signal interface to the output device. The heat exchanger must not be installed near a heat source or warm air exhaust as this will affect its performance.
Heat exchangers are available in two models (includes heat exchanger, funnel, coolant, and brass fittings):

• 120v, 50/60 Hz - 500-02031B
• 208-240v, 50/60 Hz - 500-02032B

Note:

The interface in the Polyscience chiller has a jumper across pins 1 and 9 which is used as a cable detect signal by the Trendsetter. The heat exchanger does not require an interface cable to the Trendsetter, but the firmware still expects a cable detect jumper on the interface. A jumper plug (Creo part number 220-01149A) has been created to provide the cable detect signal by connecting pins 1 and 9. This plug connects to the Chiller connector on the debris removal cabinet or to the interface on the Trendsetter if there is no debris unit installed. If the jumper plug was not shipped with one of the early heat exchanger shipments, then order a jumper plug. As a temporary measure, connect a jumper between pins 1 and 9 on the connector or mask status #25 in the firmware (mask on 25, nvs save status 1).

Procedures

For information on operating and replacing the heat exchanger, refer to the manual supplied with the heat exchanger.

• Checking temperature limits on a Trendsetter VLF or Trendsetter 3244 (TS3 or TS3/8)
• Installation and Maintenance: Heat Exchanger for Trendsetter VLF

Planned Maintenance

Refer to the manual supplied with the heat exchanger for the most up-to-date procedures.

Operator maintenance (weekly)

• Check the fluid level indicator on the front of the heat exchanger - it should be full. If not, the system should be checked for leaks.
• Vacuum the air filter on the front of the unit to keep it operating at maximum efficiency.
• Listen for unusual noise from the heat exchanger. This may be an indication of a problem with the pump or fans.

Preventive maintenance (during PM)

• Air filter - inspect the air filter and clean or replace if necessary.
  The air filter is very important on a heat exchanger since it affects the cooling capacity of the heat exchanger.
• Water filter and coolant – Lytron recommends that the water filter on the back of the unit, and the coolant be replaced every 6 months.
  The water filter has an O-ring to seal it. When replacing the filter, be careful not to damage the O-ring and make sure that the filter housing is tight when it is re-installed. A damaged O-ring may result in a slow leak. Optionally, you can lubricate the O-ring with Dow-Corning high vacuum grease to provide a better seal—Lytron coats the O-ring with this grease in the factory.
• Pump motor – the pump motor should be lubricated every 3 years using electric motor oil or SAE 10 oil.

MSDS

New! All MSDS information is now available through one portal. Go to http://msds.kpgraphics.com/company/index.asp for the most current MSDS.

Troubleshooting

• The heat exchanger makes unusual noise
  • This could be an indication that the pump or fans are failing.
• The fluid level is low
  • Check around the heat exchanger to see if there are any visible leaks. If there are no leaks visible, there may be a leak inside the output device. If a leak is visible, check that the hoses are securely connected to the heat exchanger and output device.
  • Check around the top of the water filter canister located in the back of the unit. If the leak is inside the heat exchanger, the coolant liquid will leak out the holes in the bottom of the heat exchanger.
• Head over-temperature error
  • Check that the heat exchanger is powered on.
  • Check the hoses at the back of the heat exchanger and make sure that they are securely connected.
  • Check the fluid level in the heat exchanger and make sure that it is full.
  • Inspect the air filter and clean it if it is dirty.
  • Verify that the room temperature is 30 deg C (86 deg F) or less.
  • Ensure that the air inlet is not blocked and that warm air or some other heat source is not blowing into it.

Commands and NVS parameters

Because there is no electrical interface between the heat exchanger and output device, the commands and parameters used for the chiller will have no effect on the heat exchanger. Some useful commands for systems equipped with a heat exchanger are:

• Head status: Displays the temperature of the head and the internal ambient temperature.
• Laser: Displays the status of the imaging laser diode, including the temperature.
• Mask: Mask #25 will mask the cable detect for the UDRC and the chiller/heat exchanger. This should not be masked because the system will not be able to detect whether the UDRC is connected. A 15-pin DSUB connector with a cable detect jumper is supplied with the heat exchanger. Connect this to the chiller connector on the back of the UDRC to prevent chiller cable detect errors. The cable detect jumper connects pins 1-9 on the 15-pin connector.
• Ale: Displays the status of the output device, the temperature of the engine, and the temperature of the pulley nut on the leadscrew. The engine temperature is generally 2 deg C higher than the ambient room temperature.

Parts

The air filter and the water filter are available directly from Lytron. The water filter is a standard 5-micron filter and can be ordered from a number of suppliers. Lytron part numbers are listed in the back of the Lytron operator manual.