88 Chapter 7 System Operation And Maintenance
Autoflush system of the infrared humidifier
Note
The normal operation of the autoflush system, the humidifier demands a water source with minimum water flow of 1gpm (0.063
l/s) and minimum pressure of 20PSIG (138kPa).
The autoflush control program is an integral part of the infrared humidifier system. The program automatically controls
a water makeup valve to maintain the proper water level in the water pan of the infrared humidifier during the
humidification operation. When a call for humidification exists, the program checks how long the infrared humidify has
been off.
1. If the humidifier off time is equal to or greater than the programmed value (factory default is 15hr), the iCOM
controller assumes that the pan is dry and a program called pre-fill is initiated to add water to the water pan. The pre-fill
time is different according to the different water pan size. During the pre-fill operation, the infrared lamps of the infrared
humidifier are inactive.
2. If the off time of infrared humidifier is less than the programmed value, the pre-fill program will be ignored, and the
humidification status will be appeared. At this point, the infrared lamps are energized and the water makeup valve is
opened to fill water in the water pan.
During normal infrared humidification operation, the water makeup valve will operate the periodically based on the
evaporation of water from the pan. Water is added after eight minutes humidification of the small water pan and ten
minutes humidification of the large water pan, so as to complement the water volume due to humidified consumption,
and clear the mineral floating on the water pan surface. According to the different parts of the water quality, you can
set the water volume yourself. In general, the water volume can be adjusted from 110% to 500% in 1% increments
(default: 150%).
The automatic flushing system washes the water pan of the infrared humidifier to prevent erosion caused by sediment
minerals produced in the water. As the water source regulation is different, the water volume flowing through the
system can be set by using the program to meet local needs. The selectable range of water volume is the water flush
rate of between 110% ~ 500%. After the selection of water volume, the flushing system will run automatically, without
the need for any further adjustment. See Figure 7-3 for humidification logic.
Yes
Note:
HMV: humidifier valve
IFS: Infrared small pan
IFL: Infrared large pan
Call for humidification
On in last
15 hours?
No
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 7-3 Humidification logic
7.5 Electric Heater
Check the rustiness condition of the electric heater; if possible, use the iron brush to get rid of the rust, or replace it.
The electric heater includes two types: upflow and downflow, as shown in Figure 7-4. Three temperature switches are
series connected to the control loop inside the electric heater, including two automatic reset switches and one manual
reset switch. When there is heating requirement, but no heating effect, you should use a multimeter to check whether
the cable used to temperature switch is in action, so as to ensure the three temperature switches are in normal state. If
the cable is not in action, you should remove the electric heater to check whether the manual reset switch is
disconnected, the automatic reset switch or the electric heater pipe is damaged.
Liebert.PEX2 Series Air Conditioner User Manual
Содержание Liebert PEX Series
Страница 1: ...User Manual ...
Страница 5: ......
