Chapter 6 System Maintenance 37
New Liebert_DM Series Air Conditioner User Manual
6.2.3 Drain Pipe
Inspect water pan periodically for normal operation of the drain pipe. Ensure that no foreign matter or leakage exits in
the drain pipe.
6.2.4 Heater
If the optional heater is used, it should be maintained periodically. Ensure that no dust or foreign matter collects on its
surface, the heater is fixed reliably and the cable connection is reliable.
The heater elements will heat continuously in normal station. Inspect the heater every six months for its normal
operation.
If the heater needs to be replaced, please contact the Emerson maintenance personnel.
Note
The heater cable must be leaded through the thimble socket, then connected to the heater.
6.2.5 Humidifier
The humidifier kit consists of a bracket (including water pressure components, such as inlet solenoid valve and outlet
solenoid valve), humidifier canister, humidification control board CP2 (located in a metal box close to the humidifier,
including a current transducer TAM), water in pipe, drain pipe and steam pipe, as shown in Figure 6-3.
Figure 6-3 Humidifier
The micro-processing controller calculates whether the humidification is required according to the temperature and
humidity values from the THS. If a call for humidification is registered, the micro-processing controller will send a
humidification command to the humidification control board, through the spare humidification setting port and
humidification output port located on the port board (see the connection diagram attached to the AC unit), and provide
24V power to it. Then the humidification control board will start the humidification operation. The humidification control
board adopts ON/OFF operation mode, and it controls the humidification operation according to a programmed
procedure. The humidification control board is located in a metal box close to the humidifier and its interfaces are
shown in Figure 6-4.
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