Trane IntelliPak CG-SVX02B-EN, Руководство по установке и эксплуатации

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1. when the unit is stopped (Unit Stop or External Auto/
Stop)
2. during the unit’s Power On Delay Time
3. when the primary control states are:
Ice Rebuild Delay
Ice Building Complete
A Solution Pump “Off Delay” Time may be programmed to
allow the Solution Pump to remain “On”, for an adjustable
period of time between 0.5 minutes and 10 minutes, at the
time an “Off” state is requested. The Solution Pump will al-
ways run for this delay time when turning off except during
an Emergency Stop condition. If an Emergency Stop is initi-
ated, the Solution Pump is immediately turned “Off” (relay
de-energized).
On units configured with pump mode 'Auto', a solution pump
'On Delay' of 60 seconds will be enforced after the pump
turns off to allow the solution flow proving switch to open
before the pump is allowed to start. If the flow switch opens,
this delay will be over-riden and the pump will be allowed to
start.
Low Ambient Pump Control (Standard)
A Low Ambient Pump “On” Control function (LAPC) allows
the pump to run continuously if either the entering or leaving
solution temperature falls below a programmable Low Ambi-
ent Pump Override Temperature (LAPT) Setpoint or if either
the entering or leaving Solution temperature input failure
occurs. An Auto Reset Diagnostic will be issued and remain
as long as the condition exists.
If both entering and leaving solution temperatures rise
above the Low Ambient Pump Override Temp Setpoint plus
three degrees and either temperature has risen above the
Active Leaving Solution Setpoint, the Auto Reset diagnostic
is cleared and the pump is turned off.
This function will be disabled when an Emergency Stop
request is initiated.
During service test operation, if a low ambient condition ex-
ists when the operator attempts to turn the pump “Off”, a
message will be displayed on the Human Interface Module
advising that the pump cannot be turned off due to the low
ambient condition.
Emergency Stop (Optional)
Is accomplished when a customer provided, field installed
binary input device is connected to the CGM. The unit will
immediately shut down when the contacts are opened.
Emergency Stop is a top priority command that will override
all other commands received by the UCM. A manual reset
diagnostic will occur and an indication showing that the unit
is shut down due to Emergency Stop will be displayed at the
Human Interface Module.
External Auto/Stop (Optional)
The unit can be Stopped and Started by a remote customer
provided field installed binary input device (such as a time
clock) connected to the CGM. When the input is opened
(Stop), the unit will stage the compressors and the solution
pump “Off” in a normal manner and display “Off due to ex-
ternal stop” at the unit Human Interface. When the input is
closed (Start), the unit will start and run normally.
The External Auto/Stop input operates in the same manner
as the STOP/AUTO keys on the unit mounted Human Inter
face or the Remote Human Interface (RHI). However, the
Stop key at the unit mounted Human Interface has priority
over both the remote External Auto/Stop and the Remote
Human Interface Auto/Stop.
Note: If the STOP key is pressed at the unit
mounted Human Interface, no remote AUTO (Start)
key will start the unit until the AUTO key is pressed
at the unit mounted Human Interface.
A start (AUTO) command is allowed only if no overriding di-
agnostics or higher priority function is present.
Flow Switch Interlock (Standard)
While the factory provided field installed flow switch is wired
to the CGM, if it opens for more than 6 continuous seconds
when the pump is requested to be "On", compressor opera-
tion will be inhibited and if compressors are operating, they
will be turned off. If the flow switch remains open for 5 con-
tinuous minutes an auto reset diagnostic will occur.
Chiller Heat Tape Control Output
Heat tape control for the chiller heat exchanger will be pro-
vided by the unit. If either the entering or leaving solution
temperatures fall below the heat tape temperature setpoint,
the heat tape relay on the MCM module will de-energize,
turning the heat tape on. If either of these two sensors fail,
the heat tape relay will de-energize, turning the heat tape
on. The heat tape relay will energize, turning the heat tape
off when 1) compressor operation is required, or 2) both
EST and LST rise 3
o F above the heat tape temperature.
Unit Component “Layout” and “Ship with”
Locations
(60 Ton Unit Illustrated)
General Information