YORK INTERNATIONAL
73
FORM 150.62-NM7 (103)
The above two messages will appear se quen tial ly for
each system. The fi rst dis play shows ac cu mu lat ed run-
ning hours of each com pres sor for the spe cifi c system.
The second message shows the number of starts for
each compressor on each sys tem.
S Y S X S P = 7 2 . 1 P S I G
D P = 2 2 7 . 0 P S I G
These displays show suction and discharge pressures
for each system. The discharge pressure transducer is
op tion al on some models.
If the optional discharge trans duc er is not in stalled, the
discharge pressure would dis play 0 PSIG (0 barg).
Some models come factory wired with a low pressure
switch in place of the suction trans duc er. In this case,
the suction pressure would only be displayed as the
maximum suction pres sure read ing of >200 PSIG (13.79
barg) when closed, or < 0 PSIG (0 barg) when open.
The minimum limits for the display are:
Suction Pressure: 0 PSIG (0 barg)
Discharge Pressure: 0 PSIG (0 barg)
The maximum limits for the display are:
Suction Pressure: 200 PSIG (13.79 barg)
Discharge Pres sure: 400 PSIG (27.58 barg)
These messages will be displayed for each system, if an
EEV is installed in the system. The EEV % is the EEV
controller output.
Cooler inlet temperatures, as measured by the re frig -
er ant temperature sensor in the cooler, will be displayed
on R-407c units for both systems.
Run times and starts will only be dis-
played for the ac tu al number of sys-
tems and com pres sors on the unit.
This display of the load and unload timers in di cate
the time in seconds until the unit can load or unload.
Wheth er the systems loads or unloads is de ter mined by
how far the actual liquid tem per a ture is from set point.
A de tailed de scrip tion of unit load ing and un load ing is
cov ered un der the topic of Capacity Control.
The display of COOLING DEMAND indicates the cur rent
“step” in the capacity control scheme when in Re turn
Water Control Mode. The num ber of available steps are
de ter mined by how many com pres sors are in the unit. In
the above display, the “2” does not mean that two com-
pres sor are running but only in di cates that the ca pac i ty
con trol scheme is on step 2 of 8. Ca pac i ty Con trol is
cov ered in more de tail in this pub li ca tion which pro vides
spe cifi c in for ma tion on com pres sor staging (for Return
Water Control only).
The COOLING DEMAND message will be replaced
with this message when Leaving Chilled liquid control
is se lect ed. This message indicates the temperature
error and the rate of change of the chilled liquid tem-
perature.
2
S Y S X S U C T = X X X . X ° F
S A T S U C T = X X X . X ° F
S Y S X E E V = X X X . X %
S U C T S H E A T = X X X . X ° F
S Y S X H O U R S 1 = X X X X X
2 = X X X X X, 3 = X X X X X
C O O L I N G D E M A N D
2 O F 8 S T E P S
L O A D T I M E R 5 8 S E C
U N L O A D T I M E R 0 S E C
S Y S X S T A R T S 1 = X X X X X
2 = X X X X X, 3 = X X X X X
S Y S X C O O L E R I N L E T
R E F R I G T E M P = X X X . X ° F
T E M P E R R O R X X X . X ° F
T E M P R A T E X X X . X ° F / M
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