5.10 CONDENSATE SEPARATOR
The cold air exiting the evaporator circulates into the centrifugal type condensate separator. By means of a winged diaphragm, the
incoming air attains a high-speed rotary motion. Therefore, due the centrifugal force, the condensed particles are projected onto the
lateral surface and then migrate to the bottom, which acts as an accumulation reservoir for the separated condensate and is expelled by
the drain solenoid valve at regular intervals. The resulting condensate free air exits the separator and is driven into the air-to-air
exchanger.
The centrifugal type separator offers the advantage of high efficiency, even with variable flow-rates. It doesn’t require maintenance, it
does not clog and it is able to separate solid particles as well.
5.11 DMC5 AIR DRYER CONTROLLER
4 5
2 3
1
6
ON
°C
- +
COM
B D
N
L
PROBE
A
B
C
D
E
F
DIPS
Trimmer
The DMC5 Air Dryer Controller controls the operation of the dryer, and allows
adjustment to the operating parameters. A temperature-dependent semiconductor
probe located at the end of the evaporator controls the hot-gas solenoid valve
activation. An electronic timer drives the condensate drain solenoid valve at regular
intervals.
The DMC5 Air Dryer Controller is preset to factory specifications for typical use. The
following parameters can be changed to meet specific user requirements:
The parameters which can be set up are the following :
SET-POINT SET-UP
Set-Point is the activation temperature of the hot-gas by-pass solenoid valve.
Factory specification for Set Point is 37.4 to 39.2 °F (3 to 4 °C), with a fix hysteresis -
∆
t - equal to 0.9 °F (0.5 ºC). The hot gas by-pass
solenoid valve is activated when the temperature falls below 37.4 to 39.2 °F (3 to 4 °C) and deactivated when the temperature rises over
38.3 to 40.1 °F (3.5 to 4.5 °C).
To adjust the Set Point perform the following steps:
•
Put a thermometer in the vacant copper well near the similar copper well that houses the DMC probe (insert the thermometer to the
bottom of the copper well).
•
Remove the air flow and switch ON the dryer and wait a few minutes.
•
Using a small screw driver rotate the set-point adjusting trimmer so the hot gas solenoid valve coil energizes at a temperature
between 37.4 and 39.2 °F (from 3 to 4 °C). By rotating the trimmer clockwise, the set-point will increase up to a top value of approx.
50°F (10°C); by rotating the trimmer counter clockwise, the set-point will decrease down to a minimum value of approx 32°F (0°C).
NOTE: TO BE PERFORMED BY AUTHORIZED PERSONNEL ONLY! WARRANTY WILL BE VOIDED IF DONE INCORRECTLY.
DRAINING TIME SET-UP
There are two adjustable parameters related to drain timing:
•
T
ON
- condensate drain solenoid valve activation duration time.
•
T
OFF
- Interval time between activation of the condensate drain solenoid valve.
To modify these two times, simply move the 6 micro-switches (DIPS) following the schedule below:
T
OFF
- pause time
T
ON
- activation time
DIPS
D+E+F
D+E
D+F
E+F
F
E
D
C
B
A
Time
[sec]
210
180
150
90
30
60
120
1
2
4
DIPS A, B & C adjust activation time (T
ON
).
DIPS D, E & F adjust pause time (T
OFF
); pause time can be cumulated (i.e. DIPS E+F, D+F, D+E and D+E+F).
Standard setting: DIP B and E set to ON equal to T
ON
= 2 sec and T
OFF
= 60 sec. Drain solenoid valve will be activated 2 seconds every
60 seconds.
