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54 Chapter 6 System O&M

DM Series 16kW Air Conditioner User Manual

Yes

Note:

HMV:

humidifier valve

IFS:

Infrared small pan

IFL:Infrared large pan

Call for humidification

On in last

15 hours?

refill

HMV and

lamps on

4min: IFS

7min: IFL

Humidification

lamps only

8min: IFS

10min: IFL

110% ～ 500%

HMV pre

-fill

IFS: 30s

IFL: 60s

Figure 6-4 Humidification control logic

6.1.6 Electric Reheat

Check the rust on the electric reheat. If necessary, clean the dust with wire brush, or replace the heater.

The electric reheat is classified into upflow heater and downflow heater, as shown in Figure 6-5. Three temperature

switches are in series connection within the internal control circuit of the heater, including two auto-reset switches and

one manual reset switch. When the heater does not respond to the heating demand, check that the manual reset

switch is on.

Manual reset switch

Automatic reset switch

Upflow electric reheat

Manual reset switch

Automatic reset switch

Downflow electric reheat

Figure 6-5 Upflow electric reheat and downflow electric reheat

6.1.7 Cooling System

Check the cooling system components once a month to make sure that the system function is normal and there are no

signs of wearing. Because the failure or damage of components is usually accompanied by corresponding faults,

regular checking is a major means to prevent most system faults. The refrigerant pipes must be supported by properly

set brackets, and be laid away from the ceiling, floor or anywhere that vibrates. Check the refrigerant pipes once every

six months to make sure that they are not worn out, and the fixing brackets are not loosened.

Each system has a sight glass to facilitate the observation of refrigerant flow and the system moisture content. When

the system moisture content is too high, the sight glass turns from green to yellow.

When the cooling system is faulty, you can locate the fault by referring to certain parameters of system operation.

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