NA 03.28 D
EN - 10
Direct expansion coil
Installation must be performed by qualified personnel.
For coils containing "SPLIT SYSTEM" refrigerant, the unit must not be stored near to a source of heat or in direct sunlight (increase in
refrigerant pressure).
Droplet eliminator
They are placed downstream of the cooling coil. Clean them once a year with suitable products to remove any deposits. Specially
designed products are available for this operation.
3.5 Electric heaters
Electrical connection and control with the fan motor assembly:
Always follow general safety instructions and especially current standards (e.g. NFC 15-100 on overcurrent and overvoltage protection)
when making electrical connections.
Always install an air flow pressure switch (control lot) and program a fan delay time of several minutes.
Connect the electric heater with high-temperature wires. Take into account the temperature inside the electric heater when selecting
these wires.
Example: for a 2.5 diameter, 50 m cable (4 conductors), the following are available:
- 80°C high temperature cable: Max current: 45 A - 120°C high temperature cable: Max current: 27 A
Connect these wires to the designated terminals and the terminals on the manual and automatic reset thermostats (depending on unit)
inside the box.
The stages (power-connection terminals) are identified with labels of the same colour.
If there are three stages, there will be three sets of these labels.
The connections must be made as per the schematic diagram (example for
connection of two heaters
NB:
Do not
earth the electric heater (class 2 insulation)
. Instead, make a connection to the casing as close as possible to the heater.
Power
1 ph
2 ph
3 ph
Q: main disconnect switch
QV1: fan motor thermal-magnetic circuit breaker
KV1: fan motor switch
MV1: fan motor
QR1: electric heater thermal cut-out
KR1: electric heater switch
R1: electric heater
QR2: electric heater thermal cut-out
KR2: electric heater switch
R2: electric heater
QT1: remote control thermal cut-out
INT: on/off switch
K1: time-delay relay
PA: flow rate controller
BSC1: Electric heater safety thermostat
automatic reset
BSC2: Electric heater safety thermostat
manual reset
BSC3: Electric heater safety thermostat
automatic reset
BSC4: Electric heater safety thermostat
manual reset
TH1: room thermostat
TH2: room thermostat
example:
1
2
FAN MOTOR
ELECTRIC
HEATER
ELECTRIC
HEATER
Power circuit supply
Control circuit
