Table of Contents
Advertisement
Installation Electrical
diagnostic. This condition requires manual reset at the
front of the control panel.
Connect low voltage leads to terminal strip locations on
1K2. Refer to the field diagrams that are shipped with the
unit.
Silver or gold-plated contacts are recommended. These
customer-furnished contacts must be compatible with 24
VDC, 12 mA resistive load.
External Auto/Stop
If the unit requires the external Auto/Stop function, the
installer must provide remote contact 6S1.
The chiller will run normally when the contacts are closed.
When either contact opens, the compressor(s), if
operating, will go to the RUN:UNLOAD operating mode
and cycle off. Unit operation will be inhibited. Closure of
the contacts will permit the unit to return to normal
operation.
Field-supplied contacts for all low voltage connections
must be compatible with dry circuit 24 VDC for a 12 mA
resistive load. Refer to the field diagrams that are shipped
with the unit.
Ice Building Option
Symbio™ 800 provides auxiliary control for a customer
specified/installed contact closure for ice building if so
configured and enabled. This output is known as the Ice
Building Status Relay. The normally open contact will be
closed when ice building is in progress and open when ice
building has been normally terminated either through Ice
Termination setpoint being reached or removal of the Ice
Building command. This output is for use with the ice
storage system equipment or controls (provided by
others) to signal the system changes required as the chiller
mode changes from "ice building" to "ice complete".
When contact 5K3 is provided, the chiller will run normally
when the contact is open.
Symbio™ 800 will accept either an isolated contact closure
(External Ice Building command) or a Remote
Communicated input (Tracer) to initiate and command the
Ice Building mode.
Symbio™ 800 also provides a "Front Panel Ice
Termination Setpoint", settable through Tracer
adjustable from 20 to 31°F (-6.7 to -0.5°C) in at least 1°F
(1°C) increments.
Note: When in the Ice Building mode, and the evaporator
entering water temperature drops below the ice
termination setpoint, the chiller terminates the Ice
Building mode and changes to the Ice Building
Complete Mode.
48
Equipment Damage!
Failure to follow instructions could result in damage to
system components.
Freeze inhibitor must be adequate for the leaving water
temperature.
Tracer™ TU must also be used to enable or disable Ice
Machine Control. This setting does not prevent the Tracer
from commanding Ice Building mode.
Upon contact closure, the Symbio™ 800 will initiate an ice
building mode, in which the unit runs fully loaded at all
times. Ice building shall be terminated either by opening
the contact or based on the entering evaporator water
temperature. Symbio™ 800 will not permit the ice building
mode to be reentered until the unit has been switched out
of ice building mode (open 5K3 contacts) and then
switched back into ice building mode (close 5K3 contacts.)
In ice building, all limits (freeze avoidance, evaporator,
condenser, current) will be ignored. All safeties will be
enforced.
If, while in ice building mode, the unit gets down to the
freeze stat setting (water or refrigerant), the unit will shut
down on a manually resettable diagnostic, just as in
normal operation.
Connect leads from 5K3 to the proper terminals of 1K22.
See the field diagrams which are shipped with the unit.
Silver or gold-plated contacts are recommended. These
customer furnished contacts must be compatible with 24
Vdc, 12 mA resistive load.
External Chilled Water Setpoint (ECWS)
Option
The Symbio™ 800 provides inputs that accept either 4-20
mA or 2-10 VDC signals to set the external chilled water
setpoint (ECWS). This is not a reset function. The input
defines the setpoint. This input is primarily used with
generic BAS (building automation systems). The chilled
water setpoint is set via the Tracer
through digital communication with Tracer.
The chilled water setpoint may be changed from a remote
®
TU, and
location by sending either a 2-10 VDC or 4-20 mA signal to
the 1K24, terminals 2 and 3 LLID. The 2-10 VDC and 4-20
mA each correspond to a 10 to 65°F (-12 to 18°C) external
chilled water setpoint.
The following relationships exist:
Voltage Signal
< 1 VDC
1 VDC to 2 VDC
2 VDC to 10 VDC
10 VDC to 11 VDC
> 11 VDC
NOTICE
®
AdaptiView™ TD7 or
External Water Setpoint
Invalid
min
min + (max-min)* (Signal-2)/8
max
Invalid
RTAF-SVX001K-EN
Advertisement
Table of Contents
