GB
18
INSTALLATION RETURN WATER TEMPERATURE SENSOR
• Connect the temperature sensor (
SD1
on diagram
1005753
) to the supplementary
heating electronic controller (
B1
) located in the heating control box (Terminal
S1
).
• In order to ensure that this sensor works correctly:
- ensure that the sensor is correctly secured to the piping,
- use thermoconductive paste to improve conductivity (not included),
- insulate the assembly with insulating foam (not included).
• Two cases:
1)
Tank mounted on the unit.
- The sensor, equipped with its cable (supplied with the module) is to be installed in
the location provided on the unit's water inlet. See drawing.
2)
Tank mounted separately.
- The sensor is placed on the installation's water return line. Use a metal clamp.
- This connection may be extended with a 2-conductor cable, min. size 0.5 mm
2
and
max. length: 25 meters.
To avoid problems related to electromagnetic disturbances, this cable must not be routed near power
cables.
SUPPLEMENTARY HEATING ALARM REPORT
• A potential-free change-over contact (2 A resistive, 250 Vac maximum) is available on the terminal of the heating control
unit (terminals
14
,
15
and
16
).
• Tripping of the contact indicates:
- tripping of the heater's thermal safety thermostat,
- undervoltage on the heating power circuit,
- a drop in tank water pressure.
Detail of control connections:
E
F
KM3
40
32 33
41
30 31 32 33
12 3 4
6
89
7
KM2
8
12 13
9
E
B
C
D
B1
S1
Printed Circuit
Board
6.5.5 - SUPPLEMENTARY ELECTRIC HEATING OPERATION
PRESENTATION
• The heater consists of resistance each rated at 8 kW (400 V, 3-phase), secured to the buffer tank.
• Backup is authorized with the 2nd stage, although is triggered only if the generator is out of service.
•
Securities:
- One of the resistance is equipped with a 2-threshold safety thermostat: one automatic reset threshold which is factory
set at 70°C and a manual reset set at 87°C.
- All malfunctions detected by this thermostat results in the shut-
down of the electric heating.
- After having turned off (and locked out) the power to the unit
and corrected the malfunction, the safety device is reset by
pressing the button located on the body of the thermostat. This
thermostat is accessible under the resistance’s head cover.
- This heater is also slaved to the operation of the water
circulating pump and to the water pressure switch installed on
the tank.
- These heating elements are controlled from a specific heating
control unit (see location in paragraph 4.2.3), equipped with a
2-stage electronic controller.
1
st
stage - 8 kW
2
nd
stage - 8 kW
Back-up - 8 kW
Security
PHRV 22 to 36
Tank
Heating power:
24 kW
Current:
35 A
UNIT
Electrical box
TANK
Unit
On/Off
Heat/Cool
inversion
Pump
control
Supplementary
heating
authorization
3
rd
stage
authozisation
Electronic
controller
Water
temperature
sensor (installation return)
Heating control electrical box
