Trane CVHH - Page 85

Start-up and Shut-down
CVHH-SVX001A-EN 85
Adaptive Mode Procedure—Chiller
Compressor Off
Refer to Figure 49, p. 86 for an illustration of the process
described in this subsection.
If the chiller compressor is turned Off, the purge
refrigeration circuit Off cycle is determined by the purge
control. The purge Off-cycle duration is determined by the
pump-out time, which is the greater of the following two
values:
• Daily Pumpout—24 Hours (the pump-out time over the
last 24 hours whether the chiller is On or Off)
• Average Daily Pumpout—7 Days (the pump-out time
with the chiller On over the last 7 days)
Note: These two values can be seen on the Tracer
AdaptiView display.
The purge will be shut down for a corresponding period of
time, as shown in the following table:
During the purge refrigeration circuit Off cycle, the time
remaining is displayed as the Time Until Next Purge Run
in the purge report of the Tracer AdaptiView display.
If the controls determine it is necessary to run the purge
while the chiller compressor is Off, the purge will be
started and run until 60 consecutive minutes have passed
without any pump-out of non-condensables.
If the chiller compressor starts before the purge Off cycle
has elapsed, the purge starts and transfers to Adaptive
Mode Procedure—Chiller Compressor On.
Figure 48,
p. 84
, illustrates this process.
Submodes
You can view up to six purge submodes from the Purge
Settings screen. The available purge submodes are:
Refrigeration Circuit On. appears if the purge
condensing unit/compressor is operating.
Refrigeration Circuit Idle. appears if the purge
condensing unit/ compressor is not operating.
Pumping Out. appears if the purge refrigeration circuit
is On and pump-out has been initiated by the purge unit
controls.
Exhaust Circuit Check. appears if a pump-out has been
initiated by an operator.
Pumpout Inhibited. appears if the purge refrigeration
circuit is On but pump-out has been inhibited by a low
condenser saturation temperature.
Daily Pumpout Limit Disabled. appears if the purge
refrigeration circuit is On but the daily pump-out limit has
been disabled.
Regenerating. appears if the purge carbon system is in
its regeneration mode. Pump-out is not allowed in this
submode.
Alarm–Check Diagnostics. appears if a new diagnostic
occurs.
Purge Diag Shutdown. appears if the purge system
has shut down in response to a latching diagnostic.
Regen Disabled. appears if carbon regeneration is not
allowed.
The pum p- out tim e w ith chiller On or Off
( over the last 24 hrs or daily average over
the last 7 days, w hichever is greater)
Pu rg e Of f cy cle
du ra tion
Pump-out time ≤ 1 minute 3 days
1 m inute < pump-out tim e ≤ 3 m inutes 2 days
3 m inutes < pump-out time ≤ 5 minutes 1 day
Pump-out time > 5 m inutes 6 hours