6 - ALARM DESCRIPTION
6.1 - Alarm listing
The following tables of alarms list their probable cause and the likely effect on the unit, as well as the reset type. Proposed investigations
and corrective actions shall be performed by fully qualified technician.
Description
1
EWT sensor failure
2
LWT sensor failure
Refrigerant Temperature (TR) sensor
3
failure
4
OAT sensor failure
5
DHW_TT sensor failure
6
CHWSTEMP sensor failure
10
Discharge Temperature (TD) sensor failure
Air Exchanger Temperature (TE) sensor
11
failure
14
Suction Temperature (TS) Sensor failure
TE & TS sensors wrongly connected or
16
PMV failure
17
Suction Pressure transducer failure
20
Loss of communication with UI
21
Loss of communication with Inverter
23
Loss of communication with Slaves
24
Loss of communication with Master
25
Loss of communication with Jbus Master
31
Safety Input
32
Flow Switch failure
33
High Pressure Switch failure
40
Leak detection alarm
41
Low Superheat failure
42
Compressor not started
43
Drive unconfigured
44
Four-way Valve failure
45
Lower Fan not started
46
Upper Fan not started
66
Table 6: Alarms listing
Reset type
When value returns within correct
Continue X
range
When value returns within correct
Stop
X
range
When value returns within correct
stop
X
range
When value returns within correct
Continue X
range
DHW
When value returns within correct
X
Failed
range
When value returns within correct
Continue X
range
When value returns within correct
Stop
X
range
When value returns within correct
Stop
X
range
When value returns within correct
Stop
X
range
X Error becomes definite after
Stop
X
retrying operation for 5 times.
When value returns within correct
Stop
X
range
When a new message is
Continue X
received from the UI
When a new message is
Stop
X
received from the Inverter
Master
continues X
Stop
X
When a new valid message is
Stop
X
received from the Jbus Master
Stop
X
When Safety Input is closed
Error becomes definite after
Stop
X
X
retrying operation for 5 times.
Error becomes definite after
Stop
X
retrying operation for 4 times.
When value returns within correct
X
range
When value returns within correct
Stop
X
range
Stop
X
Stop
X
Drive configuration completed
When value returns within correct
range
Stop
X
X
Power cycle after more than 3
occurrences in 2 hours
Power cycle after more than 5
Stop
X
X
occurrences in 1 hour
Power cycle after more than 5
Stop
X
X
occurrences in 1 hour
Investigation / corrective actions
Comment
1. Check EWT sensor (EWT).
2. Check NHC board.
1. Check LWT sensor (LWT).
2. Check NHC board.
1. Check TR sensor (TR).
2. Check NHC board.
1. Check Additional OAT sensor (OAT).
2. Check NHC board.
1. Check DHW sensor (DHW_TT).
2. Check NHC board.
1. Check CHWSTEMP sensor
(CHWSTEMP).
2. Check NHC board.
1. Check discharge temp. sensor (TD).
2. Check inverter connection
1. Check temp. sensor (TE).
1. Check suction temp. sensor (TS).
1. Check temp. sensor (TE, TS)
2. Check PMV (expansion valve)
electrical connexion
1. Check suction pressure. sensor (PS).
1. Ensure that water flow rate is
sufficient and fan operation is normal
2. Check PMV operation
3. Check high pressure switch electrical
connection
1. Stop and disconnect the unit
2. Check compressor connection
1. Check operation of 4-way valve
2. Check 4-way valve coil and
connection
3. Check TE, TS, TR, EWT and OAT
sensors
1. Stop and disconnect the unit
2. Check fan motor connection
3. Check if impeller is not blocked
1. Stop and disconnect the unit
2. Check fan motor connection
3. Check if impeller is not blocked