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4.2 Professional maintenance
4.2.1 Structure
Water outlet
Water inlet
Drain pipe
connection
Casing
Water outlet
Water inlet
For dual-pipe system and four-pipe cold water coil, the water inlet and outlet joints are G3/4. For four-pipe hot water coil,the
water inlet and outlet joints are G1/2.
The casing of the unit is made of galvanized steel; the air filter is made of nylon fibre, and the aluminum alloy air filter can be
customized; the motor has internal overheat protection and overcurrent protection; a centrifugal rotating fan is used; a
soundproof material such as sponge is used; the fin type heat exchanger is composed of copper pipe and aluminum foil, and
the heat exchanger pipe connection can be changed on site.
4.2.2 Maintenance
Only qualified technicians who have unit and refrigeration system experience can perform maintenance operation.
Proper gloves are required.
Before maintenance or check, disconnect the unit from power supply, keep the main switch closed with warning sign attached,
to prevent others from resuming the power accidentally.
1) Routine maintenance
2) Once every month
Check whether the air filter is clean. The air filter is washable as it is made of fibre. When the unit is operational, make sure you
check the air filter every month.
3) Once every six months
Check whether the heat exchanger and condensate drain pipe are clean. After power disconnection, disassemble the unit to
check the heat exchanger and condensate drain pipe.
Heat exchanger
Air outlet grille
Figure 4-2 Unit cased
Heat exchanger
Air outlet grille
Return air cover
Figure 4-3 Unit uncased
NOTE
06
Drain pan
Motor
Filter
Fan
Drain pan
Motor
Filter
Fan
Electric
control box
Base
Electric
control box
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