Trane CVHH CenTraVac Installation, Operation And Maintenance Manual Download

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102

CVHH-SVX001G-EN

Remaining carbon capacity% =

100 - (pump-out minutes since last regen/pump-out
minutes at 100% capacity)*100

For example, an R-1233zd-equipped chiller that has
accumulated 80 minutes of purge pump-out time since
the last carbon tank regeneration would be estimated
to have 84 percent carbon tank capacity remaining:

100 – (80/500)*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

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X39003892001A

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application only.

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•

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 determine 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 240°F (115.6°C),
and control within a ±10°F (5.6°C) dead band for
15 minutes (this step should take approximately
three hours).

•

If the carbon tank temperature does not increase
more than 25°F (13.9°C) in the first two hours,
the controller generates a non-latching
diagnostic, Carbon Regeneration Temperature
Too Low, and indicates a status of Carbon
Regeneration Disabled. The purpose of this
diagnostic is to identify a failed heater or
temperature sensor. It prevents automatic
regeneration from occurring, but a service
technician can initiate a manual regeneration for