Trane CVHH Installation, Operation And Maintenance Manual page 86

Start-up and Shut-dow n
Figure 49. Adaptive chiller OFF flow chart
First chiller power- up.
Purge operat es
cont inuously for 168
hours t o collect dat a.
Chiller On or Off.
Yes
I s purge run
No
60 m inut es
wit hout
purging?
Run purge.
The purge condensing-unit com pressor suction
tem perature varies w ith the am ount of non-condensables
collected in the purge tank. If the am ount of non-
condensables collected in the purge tank lim its the
available condensing surface in the tank, the condensing-
unit com pressor suction tem perature begins to fall.
The purge controller initiates a pum p-out cycle w hen the
suction tem perature reaches the pum p-out initiate value
that is calculated w ithin the purge control. During the
pum p-out cycle, the sm all pum p-out com pressor pulls any
non-condensables from the purge tank and discharges
them through the carbon tank. As the non-condensables
are rem oved from the purge tank, the condensing-unit
com pressor suction tem perature increases. The purge
86
Chiller Off. Purge Off.
Turn purge Off.
Hold purge Off for
6 hours.
Hold purge Off for
1 day.
Hold purge Off for
2 days.
Hold purge Off for
3 days.
The purge cont rol reviews t he hist orical
pum p- out dat a for " chiller On" and
" chiller Off" and det erm ines t he Pum pout
Tim e ( from t he last 24 hrs, or t he daily
average over t he last 7 days, whichever
is great er) .
I s Pum pout
No
Tim e less t han
5 m inut es?
I s Pum pout
No
Tim e less t han
3 m inut es?
I s Pum pout
No
Tim e less t han
1 m inut e?
controller m onitors the com pressor suction tem perature
and cycles or stops the pum p-out, depending on the
tem perature that is present.
The 1/4 hp air-cooled condensing unit of the refrigeration
system operates effectively w hen it is in the operating
range show n in Figure 50.
Yes
Yes
Yes
CVHH-SVX001A-EN