York YCAL0014E Series, Installation Operation & Maintenance

Page: 91 / 212

JOHNSON CONTROLS
91
FORM 150.62-NM8 (1020)
2
ISN – YorkTalk via ISN allows remote load
limiting and temperature reset through an ISN
system.
* LOAD LIM – load limiting enabled. Can be
either stage 1 or stage 2 of limiting
(see Section
2, Load Limiting located on Page 123 of this
IOM).
* PWM TEMP – EMS-PWM temperature
reset
(see Section 2, EMS-PWM Remote
Temperature Reset located on page 124of this
IOM).
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:
U N I T A M P S = 5 4 . 0
V O L T S = 1 . 2
If the microprocessor is programmed for CURRENT
FEEDBACK NONE, no current display will appear.
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
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.
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 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 F A N S T A G E 3
S Y S X A M P S = 3 6 . 0
V O L T S = 0 . 8
E V A P P U M P I S O N
E V A P H E A T E R I S O F F
This display indicates the status of the evaporator pump
contacts and the evaporator heater.
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 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.
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.
A C T I V E R E M O T E C T R L
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 active.
Remote monitoring may be via ISN.
temperature.
L E A D S Y S T E M I S
S Y S T E M N U M B E R 2
This display indicates the current lead system. In this
example system 2 is the lead system, making system
1 the lag system. The lead system can be manually
selected or automatic. Refer to the programming under
the OPTIONS key.
The LEAD SYSTEM display will
only appear on a two system unit.
A unit utilizing Hot Gas Bypass should
be programmed for MANUAL with
system 1 as the lead system. Failure
to do so will prevent hot gas operation
if system 2 switches to the lead system
when programmed for Automatic
Lead/Lag.