York YLAA0285SE Manual page 147

FORM 150.72-NM3 (1020)
ISSUE DATE 10/05/2020
E V A P O R A T O R
S T A T U S I S
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 (4.4 °C) the heater is turned on. When
the temperature rises above 45 °F (7.2 °C) the heater
is turned off. An under voltage condition will keep the
heater off until full voltage is restored to the system.
E V A P O R A T O R
P U M P S T A T U S
The evaporator pump dry 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 micropanel 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.
E V A P P U M P
H O U R S
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.
A C T I V E R E M O T E
N O N E
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 is 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
JOHNSON CONTROLS
H E A T E R
= X X X
W A T E R
= X X X X
T O T A L R U N
= X X X X X
C T R L
* R e f e r t o t h e s e c t i o n o n O P E R A T I N G
CONTROLS.
If the microprocessor board 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:
U N I T A M P S
V O L T S
If the microprocessor board is programmed for
CURRENT FEEDBACK NONE, no current display
will appear.
S Y S X C O M P
1 = X X X 2 = X X X
S Y S X R U N
X X - X X - X X - X X
S Y S X L L S V
H O T G A S S O L
S Y S X F A N
S Y S X A M P S
V O L T S
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.
SECTION 7 – UNIT CONTROLS
= 5 4 . 0
= 1 . 2
S T A T U S
3 = X X X
T I M E
D - H - M - S
I S O N
I S O F F
S T A G E 3
= 3 6 . 0
= 0 . 8
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