Plan a shrouded cable connection whose passage will be at
least 30 cm distant from all lines succeptible of generating para-
sites, the shrouding will be connected to the mass at both ends.
If there are several shrouded cables, each shrouding will be
connected separately (if a risk of parasite still exists, plan the
relay of several entries).
•
Distance superior to 30 meters :
Plan relaying the various entries, 1 relay per entry mounted in
the vicinity of the electronic card (cables section : 0.5 mm2).
Entries :
heating/cooling operation
– building frost free : return water temperature maintained at
30
°
C
– electrical auxiliary devices shedding/repowering : closed =
shedding
– remote assistance resetting : in case of level 1 fault, the con-
tact closing permits relaunching the electrical auxiliary devices
for 48h heating (while waiting for fault repair). This entry must
be used with a
push button
type contact.
– Common
If the heating and cooling entries are supplied simultaneously,
the unit goes into stop mode.
If the frost-free entry is supplied simultaneously with the heating
and/or cooling, the unit goes into frost-free mode
"
Managing of the unit with the MCAD5
remote control (optional)
The MCAD5 is available in the catalogue. It offers a fault exit
NO/NF (terminal box J2 of the MCAD5) and an automaticity
control (terminal box J2 of the MCAD5).
Automaticity control : you can connect a potential free contact
(ex : clock.. ;) between 1 and 2 on the terminal box J2 :
closed contact : operation of the unit authorised
open contact : unit is stopped.
ATTENTION :
do not connect a phase or a neutral on terminals
1 and 2 of terminal box J2.
Wiring diagram.
•
The green LEDs correspond to the operation of the asso-
ciated symbol (compressor running, auxiliary electrical
devices,
heating or cooling mode).
During a compressor anti-short cycle, the compressor running
green LED flashes.
•
The yelllow LEDs permit visualizing the requested action (run/
stop, access to parameters, heat pump relaunching, frost-free
mode).
•
The red LEDs signal a level 1 or 2 operating fault. In case of
level 1 fault, the key 8 (relaunch) permits relaunching the elec-
trical auxiliary devices for a 48 hours heating period (while wait-
ing for repair). The display panel indicates the 48 hrs backward
counting.
H
Parameters available for vizualization
P35, P36, P51 (see para. “commissioning”)
P65 :
software version MRS5.1
(press + for version and – for index)
Software version MCAD5 by pressing 5 sec.
The lamp test key
Liaison RS485 fault (standard visualization by
strokes on the display panel)
"
Safety and regulation devices
All the unit safety devices are controlled by the electronic card
MRS5.1. If a safety device stops the group for a level 1or 2 fault,
the fault must be read on the MRS5.1 display panel ; solve the
problem, then cancel with the RS5.1 reset key. The unit will start
again after a minimum period corresponding to the compressor
anti-short cycle.
H
Description of faults levels :
– Level 0 fault : automatic restart of the unit after fault acquittal
and a time delay
– Level 1 fault : the unit stops ; It is possible to relaunch the elec-
trical auxiliary devices for a 48hrs heating period (while await-
ing for repair).
– Level 2 fault : unit stops. Heating is impossible.
For units fitted with a switch on their supply source, the opening
of the electrical door is only possible when the switch is on
“ off ”. To carry out measurements, make adjustments on the
regulation card, visualize the faults on the MRS5.1 card. It
should therefore be back on position “ On ”, electrical door
open.
ATTENTION :
the operation can only be done by qualified staff.
IMPORTANT :
the safety devices must not be shunted.
Note :
the setting values of the unit are pre-set in factory and
cannot be modified.
H
Low pressure pressostat
This pressostat has a safety function. It is connected on the
compressor intake pipe. It controls the low pressure.
If the pressure goes down below the setting value, the com-
pressor supply is cut and displayed on the MRS5.1 display
panel (fault D.5.0). The manual acquittal is only required if 5
faults occurred within 24 hours (Fault D5.2 in heating and fault
D5.1 in cooling).
Start : 0.5 bar
Trip : 2 bar
Automatic reset thermostat
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