York YCAS Series, Installation Operation & Maintenance

Page: 162 / 216

162 YORK INTERNATIONAL
FORM 201.19-NM8 (804)
System Data:
The following sequence of three displays are provided
fi rst for System 1, then for System 2, and then for Sys-
tems 3 and 4 as applicable.
This message indicates whether the compressor on this
system is ON or OFF.
This message indicates the compressor motor current in
amps and as a percentage of Full Load Amps.
This message indicates the system oil pressure, suction
pressure, and discharge pressure.
This message shows the system oil temperature, suction
temperature, and discharge temperature.
These messages indicate compressor suction gas satura-
tion temperature and superheat.
This message indicates compressor discharge gas satura-
tion temperature and superheat.
This message indicated the compressor slide valve po-
sition. 0 steps equals minimum capacity and 75 steps
equals fully loaded.
The upper message indicates the difference (error) be-
tween actual leaving chilled liquid temperature and the
pro grammed Target temperature. The lower message
indicates the rate of change of the chilled liquid leav-
ing tem per a ture in degrees per minute. A minus sign (-)
in di cates falling temperature. No sign indicates rising
tem per a ture.
This message advises which system is programmed as
the lead.
This message indicates the position of the optional
aux il ia ry contacts for the evaporator water pump and
the status of the evaporator heater.
For the evaporator pump contacts, ON = contacts closed,
OFF = contacts open.
The Evaporator Heater status is controlled on ambient
temperature as follows: If measured ambient falls be low
40°F (4°C), the Evaporator Heater is switched ON. If
measured ambient then rises above 45°F (7°C) the heater
is switched OFF. The evaporator heater pre vents water
standing in the evaporator from freezing.
This message indicates that a remote device such as a
Remote Control Center, an ISN controller, or another
device sending a PWM signal for temperature or cur rent
reset is overriding control points programmed through
the keypad or default microprocessor set points. The
following displays may be encountered:
NONE – No remote control active. Remote
monitoring may be active.
ISN – YorkTalk via ISN or Remote Control
Center (remote mode).
PWM CURR – EMS PWM Current Limiting Enabled
PWM TEMP – EMS PWM Temp. Reset Enabled
CUR/TEMP – EMS PWM Current Limiting &
Temperature Reset Enabled
L E A D S Y S T E M I S
S Y S T E M N U M B E R #
E V A P P U M P I S O F F
E V A P H E A T E R I S O N
A C T I V E R E M O T E C T R L
N O N E
Micro Panel Contents
T E M P E R R O R 0 0 . 5
°
F
T E M P R A T E - 0 . 9 ° F / M
S Y S # C O M P R E S S O R
I S O N
S Y S # M O T O R C U R R E N T
1 3 5 A M P S 7 8 % F L A
S Y S # O I L = 1 7 5 P S I G
S P = 6 2 D P = 2 7 1 P S I G
S Y S # O I L = 1 5 4 . 8 ° F
S T = 3 9 . 0 D T = 1 2 3 . 7 ° F
S # S A T S U C T = 3 4 . 7 ° F
S U C T S H E A T = 1 0 . 5 ° F
S # S A T D S C H = 1 2 9 ° F
D S C H S H E A T = 6 2 . 8 ° F
S Y S # S V S T E P = 4 0