Section 6
COMPRESSOR OPERATION
24
CONTROL OR INDICATOR PURPOSE
THERMAL MIXING VALVE Bypasses fluid flow around the cooler until the former
reaches a temperature of 170
_
F(77
_
C).Useful forfast
warm--up during start. Maintains a minimum tempera-
ture of 180
_
F(82
_
C) during periods of low load or low
ambient temperatures.
SUMP SIGHT GLASS Indicates level of lubricant in the sump. Located on the
sump side, it should show half--full (compressor
stopped) for proper fluid level.
SEPARATOR RETURN LINE SIGHT GLASSES Indicate fluid flow in the separator return lines. Large
flow should be visible during full load operation; little to
no flow during unloaded operation. Sluggish flow dur-
ing full load operation indicates the need to clean the
strainers fitted to the return lines.
W ATER PRESSURE SWITCH De--energizes the starter, via the Supervisor II, if the
water pressure falls below 10 psig (0.7 bar). This
switch is not adjustable. Used on water--cooled pack-
ages only.
W ATER REGULATOR VALVE Regulates the amount of water used, as well as shuts
the water flow off when the package is not running.
Used on water--cooled packages only.
DRAIN GLOBE VALVES Furnished as manual backup and bypass for the auto-
matic (float--type) drain valve used in the condensate
separator vessel. Also used as lubricant sump drain
valve.
6.3 SUPERVISOR II OPERATING PARAMETERS--
SET UP
Pressing the program key enters parameter display
and edit mode. To move to the next parameter press
the program key. To increment a parameter press
the up arrow key or logo key. The logo key will incre-
ment by 10. To decrement the value press the down
arrow key.
The parameters are displayed in the following order:
S
SS
S
Unload pressure
-- The pressure where
the machine is unloaded. For example if
this parameter is set to 110 psi (7.6 bar) the
machine will unload when the line pressure
is above 110 psi (7.6 bar).
UNLOAD
100 PSI
S
SS
S
Load differential
-- The pressure differen-
tial below the unload pressure where the
machine is loaded. For example if the un-
load pressure is set to 110 psi (7.6 bar) and
the load differential is set to 10 psid (0.7
bar), the machine will load when the line
pressure goes below 100 psi (6.9 bar).
LOAD
10 PSI
S
SS
S
P1 Max
-- Maximum sump pressure. An
alarm and shut down will occur when the
sump pressure rises above this pressure.
P1 MAX
135 PSI
S
SS
S
Wye to delta transition timer
-- F o r f u l l
voltage starters this parameter is set to
zero.
WYE DELT
10 SEC
S
SS
S
Restart time
-- Time to wait after powerup
before starting machine. This parameter is
used to keep several machines from start-
ing at the same time after power up, or to
delay start until other equipment is started.
If disabled the machine will not automatical-
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