29
BRAT2 - BRAN2 EN
PEAK LIMITER ALARM SIGNALS
I A
The heat pumps can be fitted with a single-phase or three-phase peak limiter to reduce compressor start-up current.
Single-phase peak limiter
The green LED on steady indicates line voltage is present.
The red LED identifies the type of alarm, based on the
sequence of flashes. The orange LED indicates the delay
between unit starts and/or stops.
Three-phase peak limiter
The three-phase peak limiter has 2 built-in indicator LEDs.
The green LED indicates line voltage is present and correct
operation. The red LED identifies different alarm conditions
based on the sequence of flashes, as shown in the enclosed
table.
FAULT CAUSE SOLUTION
Display indication
Er75
Pressure transducer malfunction
Check electrical connection (see unit wiring dia-
grams)
Replace component
Display indication
Er81
Compressor maintenance interval
Check operating pressure
Check condition of the compressor
Reset the clock
Display indication
Er85
Water pump maintenance interval
Check condition of the water pumps
Reset the clock
Display indication
Er90
Maximum alarm log size exceeded
Reset alarm log
Values display indication
Er61
Faulty BT2 system water outlet sensor
(automatic reset)
Check electrical connections
Replace component
* monitored during inactivity and bypass
** In this situation, the red LED flashes 4 times; the service
centre needs to be contacted to reset the device.
Orange LED Condition Action
ON
Minimum recovery
time between starts
and/or recovery time
between stop and start
Autoreset when the
minimum recovery
time has elapsed
Red LED Condition Action
2 flashes
Undervoltage
Ue < 190VAC)
Autoreset after
5 minutes *
3 flashes
Overcurren
(>80 A for 1 sec.)
Autoreset after
5 minutes
4 flashes Protection relay
Autoreset after
5 minutes **
5 flashes Ramp incomplete
Autoreset after
5 minutes
Green LED Condition Action
Flashing Power supply alarm
Contact service
centre
ON
Device powered,
no faults
Awaiting
compressor
start signal
Red LED Condition Action
2
Incorrect phase sequence
Reverse the phases
3
Line voltage out
of limits
Autoreset after
5 minutes
4 Frequency out of limits
Autoreset after
5 minutes
5
Locked rotor
(during ramp)
Autoreset after
5 minutes
6
Ramp starting
> 1 sec
Autoreset after
5 minutes
7 Excess temperature
Autoreset after
5 minutes
8
Low current
(during bypass)
Autoreset after
5 minutes
9 Voltage unbalanced
Autoreset after
5 minutes if all the
three phases (L1, L2,
L3) are connected
Green LED Condition Action
Flashing
1 minute recovery
between starts and/or
recovery time between
stop and start
ON
Device powered,
no faults
ON
Device powered
during ramp
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