The supply or exhaust air channel pressure deviates too
much from the current setting for a time period of 5 min.
Supply temp., exhaust temp. or room temp. deviates too
much from the temperature indicated by the controller.
Alarm limits and duration of deviations are given in the
maintenance mode. Hint: see ”Supply air info”.
The supply or exhaust air flow speed is below the alarm
limit for a time period of 2 min. The flow alarm is activated
if the flow is under the alarm limit for 10 seconds. A cause
for the alarm may be, e.g., the belt breaks.
*)The controller shuts down the AH unit if ”Actuator stop”
has been selected from maintenance's general settings.
Pressure alarm!
Contradiction!
Deviation alarm
Supply temp.
Exhaust temp.
Room temp.
SF flow
EF flow
EF running info
SF filter PDE
EF filter PDE
SF fan PDS
EF fan PDS
SF fan PDE
EF fan PDE
Temp.relay alarm
Efficiency alarms
SF pressure
EF pressure
Flow alarm
When the controller has given a fan running command
and has not received running information after 35 s, the
controller gives a contradiction alarm. *) with 2-speed
units the controller controls the AH unit at ½ speed in the
event of a contradiction alarm.
The pressure difference (switch or transmitter information)
over the supply or exhaust air fan (or over the measuring
ring for air flow) is below the alarm limit 35 s after the unit
has been started up. (e.g., belt breaks)
The pressure difference (Pa) over the supply or exhaust
air filter is below the alarm limit 2 min after the unit has
been started up. (e.g., belt breaks)
When the controller has given a fan ½ speed running
command and does not receive running information for
35 s, the controller gives a contradiction alarm.
SF running info
EF running info
SF ½ running info
EF ½ running info
AH main pump
Cooling pump
Cooling pump
HRU pump
When the controller does not receive main pump running
information, the controller gives a pump alarm but not an
additional alarm (see p. 45).
The controller does not receive running information from
the HRU glycol pump 1)
The controller does not receive running information from
the cooling glycol pump 1)
.
1) The pump alarm is not given if the controller has stopped the pump
The fan's temperature relay (overflow protection) has
been triggered. *) In 2-speed units the controller controls
the AH unit at ½ speed.
The fan's temperature relay (overflow protection) has
been triggered.
SF 1/1 fan
EF 1/1 fan
SF 1/2 fan
EF 1/2 fan
HRU
HRU pump
The HRU's glycol pump temperature relay has been
triggered.
The cooling glycol pump temperature relay has been
triggered.
R1 R2
*)
*)
*)
In the event of an alarm the controller shuts down
the AH unit by interrupting R1 and R2 relay control.
Pump alarm
B- ALARMS
B- ALARMS
R3
The deviation alarm is given if the EF did not start
up 35 seconds after the SF started up and
contradiction alarms are not in use.
The electric heater
output is immediately
dropped to zero during
these alarms.
In the event of an alarm the controller also shuts
down the AH unit by the R3 locking relay (conn. to
the distribution centre).
Switch override
SF AC f. conv.
EF AC f . conv.
The SF (EF) freq. converter is overriden by a hand
switch, the fans run at maximum speed.
Alarm name
:
Alarm type:
Explanation:
HRU efficiency has dropped below the alarm limit.
17
