Trane Optimus RTHD, Инструкция по установке, эксплуатации и обслуживанию

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Installation Electrical
44 RTHD-SVX01K-EN
Module Connections for
Interconnecting Wiring
All connectors can be unplugged or the wires can be
removed from the screw assembly. If an entire plug is
removed, make sure the plug and the associated jack are
marked for proper location identification during re-
installation.
Interconnecting Wiring (Field Wiring
Required)
Important: Do not turn chiller on or off using the chilled
water pump interlocks.
When making field connections, refer to the appropriate
field layout, wiring, schematics and controls diagrams that
ship with the unit. The diagrams in this manual are typical
only and may not match the unit.
Whenever a contact closure (binary output) is referenced,
the electrical rating is:
Whenever a dry contact input (binary input) is referenced,
the electrical rating is 24Vdc, 12 mA.
Whenever a control voltage contact input (binary input) is
referenced, the electrical rating is 120 Vac, 5mA.
Note: Connections denoted with an asterisk require the
user to provide an external source of power. The
115V control power transformer is not sized for
additional load.
Chilled Water Pump Control
Symbio™ 800 has a evaporator water pump output relay
that closes when the chiller is given a signal to go into the
Auto mode of operation from any source. The contact is
opened to turn off the pump in the event of most machine
level diagnostics to prevent the build up of pump heat. To
protect against the build-up of pump heat for those
diagnostics that do not stop and/or start the pump and to
protect against the condition of a bad flow switch, the
pump shall always be stopped when the evaporator
pressure is seen to be close to the Low Side Evaporator
Pressure relief valve setting.
Chilled Water Flow Interlock
Symbio™ 800 has an input that will accept a contact
closure from a proof-of-flow device such as a flow switch.
The flow switch is to be wired in series with the chilled
water pump starter's auxiliary contacts. When this input
does not prove flow within 20 minutes relative to
transition from Stop to Auto modes of the chiller, or if the
flow is lost while the chiller is in the Auto mode of
operation, the chiller will be inhibited from running by a
non-latching diagnostic.The flow switch input shall be
filtered to allow for momentary openings and closings of
the switch due to turbulent water flow. This is
accomplished with a 6 seconds filtering time. The sensing
voltage for the condenser water flow switch is 115/240
Vac.
Important: DO NOT cycle the chiller through starting
and stopping the chilled water pump. This
could cause the compressor to shut down
fully loaded. Use the external stop/start
input to cycle the chiller.
Condenser Water Pump Control
Symbio™ 800 provides a contact closure output to start
and stop the condenser water pump. If condenser pumps
are arranged in a bank with a common header, the output
can be used to control an isolation valve and/or signal
another device that an additional pump is required.
Condenser Water Pump Prestart time has been added to
help with cold condenser water problems. In very cold
outdoor ambients, the cooling towers sump cold water
would reach the chiller some time after the low system
differential pressure protection had run through its ignore
time, and result in an immediate shutdown and latching
diagnostic. By simply starting the pump earlier, and
allowing mixing of the warmer indoor loop with the
cooling tower's sump, this problem can be avoided.
Condenser Water Flow Interlock
The Symbio™ 800 shall accept an isolated contact closure
input from a customer installed proof-of-flow device such
as a flow switch and customer provided pump starter
auxiliary contact for interlocking with condenser water
flow. The input shall be filtered to allow momentary
openings and closings of the switch due to turbulent water
flow, etc. This shall be accomplished with a 6 seconds
filtering time. The sensing voltage for the condenser water
flow switch is 115/240 Vac.
On a call for cooling after the restart inhibit timer has timed
out, the Symbio™ 800 shall energize the condenser water
pump relay and then check the condenser water flow
switch and pump starter interlock input for flow
confirmation. Startup of the compressor will not be
allowed until flow has proven.
If flow is not initially established within 1200 seconds (20
minutes) of the condenser pump relay energizing, an
automatically resetting diagnostic “Condenser Water
Flow Overdue” shall be generated which terminates the
NOTICE
Equipment Failure!
Plugs and jacks must be clearly marked before
disconnecting, because specific plugs will fit into other
jacks. Possible damage to equipment may occur if the
plugs are reversed with the jacks.
At 120 Vac
7.2 amp resistive
2.88 amp pilot duty
1/3 hp, 7.2 FLA, 43.2 LRA
At 240 Vac
5.0 amp resistive
2.0 amp pilot duty
1/3 hp, 3.6 FLA, 21.6 LRA