Connection diagram
Figure 21
The electric valve package kits and room thermostat are optional parts. If they are required by customers,
the electric valve package kits can be installed in factory (refer to Figure 22) and the room thermostat will be
with the unit as accessory.
Figure 22
Maintenance
L Operating voltage AC 250 V
M 3-speed fan
N Neutral
Q1 Control output
“Fan speed ”, AC 250 V
Q2 Control output
“Fan speed ”, AC 250 V
Q3 Control output
“Fan speed ”, AC 250 V
Y Control output
“Valve actuator”, AC 250 V
D Thermal valve or zone valve
Water inlet
Brass connector
Water outlet
2-way valve
General
Installation and maintenance should be performed by qualified persons who are familiar with local code and
regulation, and experienced with this type of appliance.
Confirm that the unit has been switched OFF before installing or servicing the unit.
A good general maintenance plan will avoid loses and unexpected shutting down of the equipment.
Dirty filters reduce air flow as well as unit performance. Thus changing or cleaning the filters is very
important. Check the cleanliness of filter and replace or clean as required monthly.
Coils shall be cleaned from dust, dirt or lint with compressed air, water. They can be brushed with a soft
brush and vacuum cleaner.
Water coil not used during winter season shall be drained, or anti-freezing solution shall be added to the
water circuit to avoid freezing.
Month intervals
1 Inspect and clean condensate drain pan to avoiding clogging of drainage by dirt, dust, etc. Inspect
drainage piping to ensure the proper condensate flow.
2 Check and clean the coil. Clean the coils with low pressure water jet or low pressure air.
3 Clean and tighten all the wiring connections.
4 Drain out the system water and check for build up of mineral deposits.
Page 39
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