Acson international 5WSS 07AR Mode D'emploi page 19

1. Make sure all wiring connection is correct and power supply is compatible to the rated voltage.
2. Open all valves in full open position and start the circulating pump. Make sure there is water running through the water
loop before operating the unit.
3. Set to mode 'Cool'. Then set the temperature to the coolest. The unit has time delay which protects the compressor for
short cycling. Wait for a few minutes before check on the air discharge for cool air delivery.
4. Measure the temperature difference between entering and leaving water. It should before approximately 1.3 to 1.5 times
greater than the heating mode temperature difference.
Example: If water temperature difference in cooling mode is 5°C (9°F), the heating mode difference should be 3.3°C
(6°F).
5. If without automatic flow control valves, target the cooling mode water temperature difference between 5°C (9°F) to 8°C
(14.4°F). This can be achieved by adjusting shut-off / balancing valve in the return piping to a suitable water flow rate to
achieve the desire temperature difference.
6. Set to mode 'Heat'. Set the temperature to the warmest. Again the air conditioner has built in time delay that prevents the
compressor to start immediately. The fan will start first before the compressor. Check for warm air discharge. If it is a 'cold
building' start-up, leave the unit running until return air to the unit is at least 18°C (65°F).
7. Measure the temperature difference between entering and leaving water. With entering water temperature of 16°C to 27°C
(60°F to 80°F), leaving water temperature should be 3.3°C to 6°C (6°F to 12°F) cooler and the air temperature rise through
the machine should not exceed 19°C (35°F). If the air temperature exceeds 19°C (35°F), then the water flow rate is
inadequate.
8. Check for vibration refrigerant piping, fan wheels, etc.
NOTE
• Water source heat pump split type unit is controlled by fan coil unit.
• The controller is located on the fan coil unit.
• Ensure there is water supply into the unit at all times before operating.
• Service and maintenance should be performed by authorized dealer or qualified contractor.
• Internal components can be accessed through two service panels (front and back). External control box for easy access of
electrical components.
• Regular checks on the water strainer are recommended. Clean the strainer if dirty or clogged.
• Maintain a log data on measurement of volts, amps, and water temperature difference (heating & cooling) is recommended.
A comparison of the data during start-up and periodic data is useful as indicator of general condition of equipment.
• Do not attempt to do any service or maintenance when the unit is operating.
• Unauthorized modification of the unit is not allowed.
All manuals and user guides at all-guides.com
UNIT START UP AND OPERATION
! ! ! ! ! CAUTION
SERVICE AND MAINTENANCE
! ! ! ! ! CAUTION
1-8