Johnson Controls YORK Tempo YLAA Series, Installation Operation & Maintenance

Page: 135 / 192

FORM 150.72-NM1 (1020)
135
JOHNSON CONTROLS
7
If the microprocessor is programmed for CURRENT
FEEDBACK ONE PER UNIT under the OPTIONS
key, the display will show up as the first display prior
to the SYS 1 displays. Total chiller current is displayed
as shown below:
If the microprocessor is programmed for CURRENT
FEEDBACK NONE, no current display will appear.
The preceding five messages will appear sequentially,
first for system 1, then for system 2.
The first message indicates the system and the associated
compressors which are running.
The second message indicates the system run time in
days – hours – minutes – seconds. Please note that this
is not accumulated run time but pertains only to the
current system cycle.
The third message indicates the system, and whether the
liquid line solenoid or EEV pilot solenoid and hot gas
solenoid are being turned on by the microboard. Please
note that hot gas is not available for system 2, so there
is no message pertaining to the hot gas solenoid when
system 2 message is displayed.
The fourth message indicates the stage of condenser fan
operation that is active.
See the section on Condenser Fan Control in the UNIT
OPERATION section for more information.
U N I T A M P S = 5 4 . 0
V O L T S = 1 . 2
S Y S X R U N T I M E
X X - X X - X X - X X D - H - M - S
S Y S X C O M P S T A T U S
1 = X X X 2 = X X X 3 = X X X
S Y S X L L S V I S O N
H O T G A S S O L I S O F F
S Y S X A M P S = 3 6 . 0
V O L T S = 0 . 8
S Y S X F A N S T A G E 3
This display indicates the status of the evaporator heater.
The evaporator heater is controlled by ambient air
temperature. When the ambient temperature drops below
40 °F the heater is turned on. When the temperature rises
above 45 °F the heater is turned off. An under voltage
condition will keep the heater off until full voltage is
restored to the system.
The evaporator pump contacts are energized when any
compressor is running, or the unit is not OFF on the
daily schedule and the unit switch is on, or the unit
has shutdown on a Low Leaving Chilled Liquid fault.
However, even if one of above is true, the pump will
not run if the micro panel has been powered up for
less than 30 seconds or if the pump has run in the last
30 seconds to prevent pump motor overheating. This
contact supplies 115 VAC to the pump contactor.
The Evaporator Pump Total Run Hours display indicates
the total pump run hours. Total hours continually
increments similar to Compressor Run Hours. If dual
pumps are fitted, run hours indicates total hours on both
pumps.
There are several types of remote systems that can
be used to control or monitor the unit. The following
messages indicate the type of remote control mode
active:
NONE – no remote control active. Remote monitoring
may be via ISN.
ISN – YORK Talk via ISN allows remote load limiting
and temperature reset through an ISN system.
LOAD LIM – Load limiting enabled using contact
closure.
PWM TEMP – EMS temperature reset
E V A P O R A T O R H E A T E R
S T A T U S I S = X X X
E V A P O R A T O R W A T E R
P U M P S T A T U S = X X X X
E V A P P U M P T O T A L R U N
H O U R S = X X X X X
A C T I V E R E M O T E C T R L
N
O N E