Start-up and Shut-down
CVHH-SVX001A-EN 89
For example, an R-1233
zd
(E)-equipped chiller that has
accum ulated 80 m inutes of purge pump-out time since the
last carbon tank regeneration would be estimated to have
84 percent carbon tank capacity remaining:
100 – (80/350)* 100 = 84%
The purge controls may initiate a carbon tank regeneration
cycle when the remaining carbon tank capacity is
calculated to be less than 80 percent. However, the
continued stable operation of the chiller is always more
important than the regeneration of the carbon tank.
Therefore, the following rules apply:
1. If the Daily Pump-out Limit is disabled, a regeneration
cycle may not be initiated, regardless of the value of
the remaining carbon capacity.
Also, if the Daily Pump-out Limit is disabled during a
regeneration cycle, the regeneration cycle must be
terminated.
2. When the remaining carbon capacity is less than
80 percent, a regeneration cycle will be initiated at the
next opportunity when the chiller is running (after the
chiller has started and no pump-out minutes have
accumulated for the previous 60 minutes).
3. If there is no opportunity to purge as indicated by Rules
1 and 2 and the remaining carbon capacity is less than
50 percent, a regeneration cycle will be initiated at the
best opportunity when the chiller is shut down (and no
pump-out minutes have accumulated for the previous
60 minutes).
4. If there is no opportunity to regenerate as indicated by
Rules 1, 2, and 3, and the carbon capacity drops below
0 percent, then a regeneration cycle is initiated.
5. Note that if at any time during the regeneration cycle,
the chiller is running and shuts down or if the chiller is
off and starts up, then the regeneration cycle is
continued.
Carbon Tank Regeneration Sequence
Note: Graphic labels (shown above) are used for CE
application only.
Important:
• Before servicing, disconnect all power sources and
allow at least 30 minutes for capacitors to discharge.
• All electrical enclosures—unit or remote—are IP2X.
If the purge controller determines that carbon tank
regeneration is desired and is allowed, the purge controls:
1. Disable the purge refrigeration circuit and the pump-
out solenoid valve.
2. Open the regeneration solenoid valve and turn on the
carbon tank heater.
3. Monitor the carbon temperature until it reaches the
regeneration temperature value of 115.6°C (240°F), and
control within a ±5.6°C (±10°F) dead band for
15 minutes (this step should take approximately
3hours).
WARNING
Hazardous Voltage
Failure to disconnect power before servicing could
result in death or serious injury. Disconnect all electric
power, including remote disconnects before servicing.
Follow proper lockout/ tagout procedures to ensure the
power can not be inadvertently energized.
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