Movincool CMW30 - Inspection of Water System

Repair Section
65
8.11 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 5.3 gal/min (20 L/min) at 6 psi (40 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 130 °F (54 °C).
• The unit’s maximum LWT is 150 °F (66 °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 related to
clogged water system.
- 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) Turn off the unit and disconnect power. Shut off
the water supply and disconnect the drain plugs
to drain the water from the drain ports. Then
disconnect the water pipes.
2) Connect tap water to the water inlet of the unit.
Connect water outlet of the unit to drain.
ILL00437-00
Water
Supply
Water
Return
Drain Plug
Drain Port
Shut-off Valve
CMW30
Unit