Carrier 30RQ Operation And Maintenance Instructions page 14

Information menu (3) continued
Item Format Units
14 [2]
occu -
unoc
Forc
15 ±nn.n °C
16
±nn.n °C
Forc
17 ±nn.n °C
18 n
19 n
[1] This item is masked when nil.
[2] This item is displayed in certain unit configurations only.
Description of operating modes (item 1 of the Information menu)
Mode # Mode name
1 Delay at start-up active
2 2nd cooling/heating setpoint active
3 Setpoint reset active
4 Demand limit active
5 Ramp loading active
6 Water heat exchanger heater active
7 Evaporator pump reversal in effect
8 Evaporator pump periodic start
9 Night mode (low noise level)
10 Unit in SM control
11 Master/slave link active
12 Auto heating/cooling changeover active
13 Free cooling mode active
14 Heat reclaim mode active
15 Electric heating stages active
16 Low water entering temperature protection
in heating mode
17 Boiler active
18 Ice storage mode active
19, 20 Defrost
21, 22, 23 Low suction temperature protection
24, 25, 26 Hot gas protection
27, 28, 29 High pressure protection
30, 31, 32 Low superheat protection
14
Description
Setpoint occupied mode.
Occupied: cooling setpoint 1 is active
Unoccupied: cooling setpoint 2 is active
The value shall be displayed in turn with 'Forc' when the unit is in CCN control and if this variable if forced through CCN.
Active setpoint. This is the current cooling/heating setpoint: cooling/heating setpoints 1, 2 or ice storage setpoint.
Control point. This is the setpoint used by the controller to adjust the temperature of the leaving or entering water (according to
configuration).
Control point = active setpoint + reset. See section 5.6
The value is displayed in turn with 'Forc' when the unit is in CCN control and if this variable if forced through CCN.
Controlled water temperature. Water temperature that the unit tries to maintain at the control point.
Heat reclaim sequence indicator, circuit A (option).
Heat reclaim sequence indicator, circuit B (option).
Description
The delay at start-up operates after the unit has been switched on. If the delay has not expired, the mode is
active. The delay is configured in the User Configuration 1 menu.
The second cooling/heating setpoint is active. See section 5.6.1
In this mode, the unit uses the reset function to adjust the leaving water temperature setpoint.
In this mode, the demand at which the unit is authorised to operate is limited.
Ramp loading is active. This item is referenced to the allowed low and high temperature limits, controlled at the
water heat exchanger in order to prevent compressor overloading. Ramp function must be configured (see
User Configuration 1 menu). Ramp values can be modified (see Setpoint menu).
The water heat exchanger heater is active.
The unit is fitted with two evaporator water pumps and reversal between pumps is in effect.
The unit is stopped and the pump is started each day at 14.00 p.m. for two seconds. This function needs to be
configured in the User Configuration 2 menu.
The night mode (low noise level) is active. The number of fans is reduced (if operating conditions allow) and
unit capacity can be limited.
Unit is in control of a System Manager (FSM, CSM III or HSM).
Unit is connected to a secondary unit by a master slave link and the master/slave modes are active.
If the unit is in auto mode, the heating/cooling changeover is automatic, based on the outdoor temperature.
The free cooling mode is active.
The heat reclaim mode is active.
The electric heating stages are active.
The unit is in heating mode and compressor start is not authorised, as the entering water temperature is below 10°C.
The unit controls a boiler and this is operating.
The unit operates in cooling mode and the ice storage mode is active.
19 = circuit A, 20 = circuit B. The unit is in heating mode, and the defrost sequence is active on the relevant circuit.
21 = circuit A, 22 = circuit B, 23 = circuit C. Protection for evaporator low suction temperature circuit is active. In
this mode, circuit capacity is not authorised to rise and the circuit can be unloaded.
24 = circuit A, 25 = circuit B, 26 = circuit C. Hot gas discharge protection is active. In this mode, the circuit
capacity cannot increase, and the circuit may be unloaded.
27 = circuit A, 28 = circuit B, 29 = circuit C. The circuit is in high pressure protection mode because the HP
protection threshold has been exceeded. Circuit has been unloaded and the circuit capacity is not authorised
to rise.
30 = circuit A, 31 = circuit B, 32 = circuit C. The circuit is in the low superheat protection mode to prevent the
compressors drawing in liquid refrigerant.