3. Maintenance
3.1 General
The CDU should be cleaned on a regular basis and checked for leaks and malfunctions.
Maintenance should only be carried out by personnel qualified to work on this type of equipment.
For information on Maintenance or Service Support, contact the supplier - detail in Section 4.3
3.2 Fluid Specifications
Primary Circuit
The RM100 CDU is designed for use with a facility supply of plain water or up to 20% glycol/water. A
20% glycol concentration will give protection to approx. -9°C (16°F). If a higher concentration of
glycol is used, then the cooling capacity of the unit may have to be de-rated (contact manufacturer
for advice).
Secondary Circuit
The secondary circuit should be filled with particulate free deionized water treated with suitable
corrosion inhibitors and biocides, or Recochem OAT PG-25 computer coolant.
Failure to use adequate water treatment may result in decreased system performance and reliability
due to corrosion, scaling, fouling and microbiological growth which may invalidate the warranty.
3.3 Planned Maintenance
Planned maintenance services should be carried out every 6 months following installation &
commissioning.
3.3.1 Special tools/equipment
- Surface temperature measurement device
- Air temperature measurement device
- Clamp-on ammeter
- Drain tube (supplied with unit)
- Fluid sample kit (for fluid analysis)
- Micro-SD card reader and computer
3.3.2 Visual checks for damage & leakage
- Pipework and hoses
- All temperature, level, flow and pressure sensors
- Expansion vessel and Schrader valves
- Vent & drain points
- Pump clamped connections
- Pipe/hose clamped connections
- Check running pump for abnormal noise
- Record any damage to unit
3.3.3 General settings
- Record unit serial no. on maintenance check list
- Record values from controller display home page
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