Trane SEHJ090-162, Инструкция по установке, эксплуатации и обслуживанию

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Unit Startup
98 RT-SVX24J-EN
The drain control can be configured via the Human
Interface, and by the drain actuator installation, to hold or
drain water on power loss; the default is set to drain.
Periodic purge is a cyclic opening of the drain to remove
debris and buildup from the sump and add additional
fresh water to the sump. Periodic purge has an adjustable
interval from the setup menu on the Human Interface with
a range of 1-12 hours or can be set to disabled - the default
position if periodic purge is not required.The duration of
the blowdown, or the time that the drain valve is opened,
is adjustable to a range of 5 - 255 seconds, with 120
seconds being the default.
The optional conductivity controller also uses this timer to
open the drain, when required, based on water quality.
During this purge, the fill solenoid will remain energized to
provide fresh water to the sump to replace water being
released during the blowdown. Water treatment
blowdown is provided by shorting the designated input on
the customer-supplied terminal strip. This gives the
customer more flexibility in determining water conditions
via external controls. Once the input is detected closed, the
drain valve will be opened for a time equal to the Human
Interface adjustable periodic purge duration.
Once the duration timer expires, or if the minimum level
switch opens, the drain valve will be closed and the water
treatment blowdown input will be ignored for 15 minutes.
During this blowdown the fill relay will remain open to
provide fresh water to the sump.The adjustable duration
time period should be set so that during drain operation 1
inch of water is drained from the sump with the fill
solenoid valve closed. If the minimum water level switch
opens during a blowdown cycle, the unit will de-energize
the sump pump in order to protect the compressors and
sump heater from insufficient water levels. Once the water
level reaches the minimum level input and this input
closes for 10 seconds, the compressors and sump heater
operations will be allowed to restart.
Evaporative Condenser Drain Valve Setup
The drain valve is shipped to “Drain During Unit Power
Loss Conditions.” This means that when the unit
disconnect is turned off, the 1S2 toggle switch is turned off,
or the unit loses power, the drain will open. The valve is
spring loaded and will travel from fully closed to fully open
in approximately 25 seconds.
This is desirable in cold climates where a risk of freezing
exists. In milder climates it may be desirable to keep the
water in the sump when unit power is off to avoid
unnecessarily wasting water whenever the unit
disconnect is turned off.
To convert the unit to “Hold During Unit Power Loss
Conditions”:
1. Remove power from the unit.
2. Remove the weather shield cover ( Figure 62, p. 98 ).
3. Loosen the shaft set screw ( Figure 62, p. 98 ), remove
the locking clip, remove the shaft adapter ( Figure 63,
p. 99 ).
4. Lift the drain valve actuator and rotate it to the “hold
during power loss” position. ( Figure 64, p. 99 )
5. Reinstall the shaft adapter and locking clip and reinstall
the actuator onto the base. Make sure the arrow on the
shaft adapter is set to 0°.
6. Make sure the valve is in the fully closed position, then
tighten the shaft set screw.
7. Reinstall the weather shield cover.
8. Restore power to the unit.
9. At the Human Interface, press SETUP, NEXT until 'Head
Pressure Control Setup Submenu” is seen. Press
ENTER.
10. Change the “Sump Drain Valve Relay Control” from
Drain to Hold.
Figure 62. Drain valve actuator with weather shield
Weather Shield
Shaft Set Screw
Drain Valve Actuator