Unit Start/Stop Control - Carrier AQUASNAP 30RB Manual De Controles Y Soluciones De Defectos

The summary interface (right hand section) includes a
mimic diagram of the unit, together with push-buttons
and LEDs. It gives quick access to the main operating
parameters of the unit.
SUMMARY INTERFACE LED'S
LED INDICATION WHEN LIT
Green LED:
The unit is authorised to start or is already running
Red LED:
A
- Lit: circuit A or unit shut down by alarm
- Flashing: circuit A or unit running with alarm present
Red LED:
B
- Lit: circuit B or unit shut down by alarm
- Flashing: circuit B or unit running with alarm present
Red LED:
C
- Lit: circuit C or unit shut down by alarm
- Flashing: circuit C or unit running with alarm present
Green LED:
The evaporator pump is running.
Yellow LEDs:
From top to bottom - start/stop status of compressor A1, A2, A3 and
A4 or B1, B2, B3 and B4 or C1, C2, C3 and C4. Flashing LED indi-
cates that the circuit is in the protection or defrost mode (A, B or C).
Green LED:
The unit operates in heating mode.
Green LED:
The unit operates in cooling mode.
SUMMARY INTERFACE PUSH BUTTONS (DUAL-CIRCUIT)
BUTTON DISPLAY
Blue button: evaporator leaving or entering water temperature in °C
Gray button: outdoor air temperature in °C
Control point (setpoint + reset) in °C
Press 1: circuit A/B discharge pressure in kPa
Press 2: circuit A/B saturated condensing temperature in °C
(1)
Press 1: circuit A/B suction pressure in kPa
Press 2: circuit A/B saturated suction temperature in °C
(1)
Press 1: compressor A1/B1 operating hours in h/10 or h/100
Press 2: compressor A2/B2 operating hours in h/10 or h/100
(1)
Press 3: compressor A3/B3 operating hours in h/10 or h/100
Press 4: compressor A4/B4 operating hours in h/10 or h/100
(1) There is a separate button for each of the two circuits.
SUMMARY INTERFACE PUSH BUTTONS (TRIPLE-CIRCUIT)
BUTTON DISPLAY
Blue button: evaporator leaving or entering water temperature in °C
Gray button: outdoor air temperature in °C
Control point (setpoint + reset) in °C
Press 1: circuit A/B/C discharge pressure in kPa
(1)
Press 2: circuit A/B/C saturated condensing temperature in °C
Press 1: circuit A/B/C suction pressure in kPa
Press 2: circuit A/B/C saturated suction temperature in °C
(1)
Press 1: compressor A1/B1/C1 operating hours in h/10 or h/100
Press 2: compressor A2/B2/C2 operating hours in h/10 or h/100
(1)
Press 3: compressor A3/B3/C3 operating hours in h/10 or h/100
Press 4: compressor A4/B4/C4 operating hours in h/10 or h/100
Press 1: Selects circuit A to display information
(only on triple-circuit units)
Press 1: Selects circuit B to display information
B
B
(only on triple-circuit units)
Press 1: Selects circuit C to display information
C
C
(only on triple-circuit units)
(1) There is a common button for the three circuits; for circuit selection press one
of the three last buttons described above.

4.2 - UNIT START/STOP CONTROL

4.2.1 - DESCRIPTION
The unit start/stop can be controlled by one of the following
methods:
• Locally on the actual unit (Local control type);
• By remote control with the aid of user contacts (remote
control type);
• By CCN control with the aid of the CCN (CCN control
type).
The main interface includes a Start/Stop button which can
be used to stop or start the unit in the local operating type
or to select the remote or CCN operating type.
The available operating types are described in the following
table.
The following operating types can be selected using
the Start/Stop button:
OPERATING TYPES
4 DIGIT DISPLAY DESCRIPTION
LOFF Local Off. The unit is halted in local mode.
L-On Local On. The unit is in local control mode and is
authorised to start.
L-Sc* Local On - timer control. The unit is in local control
mode. It is authorised to start if the period is occupied.
If the timer program for unit operation is unoccupied,
the unit remains shut down until the period becomes
occupied.
CCN CCN. The unit is controlled by CCN commands.
rEM Remote. The unit is controlled by remote control
contacts.
MAST* Master Unit. The unit runs as a master in a two unit
lead/lag arrangement. This is displayed if the unit is
configured for master/slave control.
Legend
* Displayed if the configuration requires it.
Section 5.1 gives a more detailed description of the commands to start/stop
the unit, analysed by operating type.
4.2.2 - STOPPING THE UNIT IN LOCAL MODE
The unit can be stopped in local mode at any time by
pressing the Start/Stop button.
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