MovinCool Office Pro W20 Service Manual - Manual (Page 52)

Repair Section
52
9.12 Inspection of Water System
• In most cases, the cause for insufficient cooling is a clog in the system, a leakage, or an incorrect
amount of water in the system. In such cases, inspect the system according to the following
procedure.
(1) Insufficient Water flow
Sufficient water flow is required while the unit is operating. Insufficient water flow can activate
the high pressure switch causing the unit to stop. The recommended supplied water source
should have a minimum flow rate of 4.8 gal/min (18 L/min) at 7psi (50 kPa) or higher.
• Insufficient water flow can be estimated by measuring the leaving water temperature (LWT).
During normal operation, the LWT should be less than or equal to 104 °F (40 °C).
• The unit’s maximum LWT is 120 °F (49 °C). If the LWT is higher than the maximum value, adjust
the supplied water source to meet the recommended minimum flow rate or higher.
(2) Clogged water system
• In case a self-diagnostic code “HP” is displayed, there are two possible causes.
- Condensing capacity is reduced by accumulated sediment.
- Water line is clogged with accumulated sediment.
• Clean inside of the water system to remove accumulated sediment. For details, see below.
(3) Cleaning inside of the water system
The water regulating valve in the water system can be manually flushed to clear any sediment
accumulated inside of the water system.
1) Stop the unit and unplug the power cord. Then
shut off the water supply and disconnect the
water pipes or hoses.
2) Connect tap water to the water inlet of the unit.
Connect water outlet of the unit to drain.
3) Remove five (5) screws from the service panel on
the rear side of the unit.
ILL00147-00
Screws (5)