Service Key Parameters - York J Series Manual

Cooling SAT Limit #1
This tells the control what the low limit is for the
SAT during mechanical cooling when only one com-
pressor is operating as used for excessive SAT cooling
evaluation.
Cooling SAT Limit #2
This tells the control what the low limit is for the SAT
during mechanical cooling when more than one com-
pressor is operating as used for excessive SAT cooling
evaluation.
Heating SAT Limit
This tells the control what the high limit is for the Sup-
ply Air Temperature during heating operation as used
for excessive SAT heating evaluation.
Power Exhaust Config
This tells the control if the unit is supplied with a Power
Exhaust System and what type of power exhaust system
it is. There are four (4) options:
• No Powered Exhaust:
This Power Exhaust Configuration setting is set to
0 when the unit is not equipped with a powered
exhaust.
• 2-Position Control Based on OAD Position:
The Power Exhaust Configuration setting is set to
1 for this exhaust system. This is a two position
control based on OAD Position, and cycles a single
speed exhaust fan based on the position of the Out-
side Air Damper (OAD).
• 2-Position Control Based on Building Pressure:
The Power Exhaust Configuration setting is set to 2
for this exhaust system. This is a two position con-
trol based on building pressure and cycles a single
speed exhaust fan based on the static pressure within
the building or space.
• Proportional Control Based on
Building Pressure:
The Power Exhaust Configuration setting is set to 3
for this exhaust system. This setting is proportional
control based on building pressure and modulates
either a discharge damper on a single speed ex-
haust fan, or modulates a Variable Frequency Drive
(VFD) on a variable speed exhaust fan based on the
static pressure within the building or space. The
control output is the same for either case.
JOHNSON CONTROLS
Economizer Installed
This setting tells the control that there is Economizer
hardware installed on the unit.
Duct Sensor Hi Limit
The Duct Sensor High Limit is used to select the upper
measurement limit of the sensor used for measuring the
static air pressure of the supply air duct. This selection
will be either 5.0 inwg for 2.50 inwg, depending on duct
pressure transducer used.

SERVICE KEY PARAMETERS

These parameters are normally view-only, but can
be accessed by service personnel to make changes to
run-timers, such as would be the case if a compressor
or fan motor was replaced.
Sys X Comp Runtimes
The compressor runtimes are changed only when a com-
pressor is replaced. This entry would be zero for a new
compressor. If the compressor is previously used, this
value in hours would be the run-time on the compressor
if known. There are entries for each compressor. Each
system (X:1-3) is displayed with the value selected and
entered for a compressor in the system (Y:A or B).
Sys X Comp Starts
The number of compressor starts are changed only when
a compressor is replaced. This entry would be 0 for a new
compressor. If the compressor is previously used, this
value is the no. of starts on the compressor if known.
There are entries for each compressor. Each system (X:
1-3) is displayed with the value selected and entered for
a compressor in the system (Y:A or B).
Supply Fan Runtimes
The Supply Fan runtime is changed only when the fan is
replaced. This entry would be zero for a new fan. If the
fan is previously used, this value in hours would be the
runtime on the fan if known. The user must determine
whether this number is used to represent the fan motor
and impeller assembly (i.e. bearings).
The "setpoints" are listed in Table 7 and show the units
of measure, default values, value ranges, and which key
the "setpoint" is located under.
FORM 100.50-NOM7 (808)
59
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