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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).
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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.
IMPORTANT: Always install an air flow pressure switch
(control lot) and program a fan delay time of several minutes.
IMPORTANT: 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.
Power
1 ph
2 ph
3 ph
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
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exemple :
1
2
FAN MOTOR
ELECTRIC
HEATER
ELECTRIC
HEATER
Power circuit supply
Control circuit
Q
Main disconnect switch
QR2 Electric heater thermal cut-out
BSC1 Electric heater safety thermostat
automatic reset
QV1 Fan motor thermal-magnetic circuit breaker
KR2 Electric heater switch
BSC2 Electric heater safety thermostat
manual reset
KV1 Fan motor switch
R2
Electric heater
BSC3 Electric heater safety thermostat
automatic reset
MV1 Fan motor
QT1 Remote control thermal cut-out
BSC4 Electric heater safety thermostat
manual reset
QR1 Electric heater thermal cut-out
INT
On/off switch
TH1
Room thermostat
KR1 Electric heater switch
K1
Time-delay relay
TH2
Room thermostat
R1
Electric heater
PA
flow rate controller
NB: Do not earth the electric heater (class 2 insulation). Instead, make a connection to the casing as close as possible to
the heater.
3 - INSTALLATION
14
Summary of Contents for 39CZ
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