Electrical Connections - Hitecsa EWMIG 236 Manual De Instalación, Uso Y Mantenimiento

Condensation drain tray
EWMIG models are complete with a condensate drain tray and heating
electrical resistance that prevents ice from developing under the coil in
cases of harsh temperatures. Electrical resistance is regulated
according to the outdoor temperature. The factory-set activation set-
point is 2°C.
The condensate drain pan has two drainage points to facilitate the
evacuation of the water. It is advisable to channel with a tube suitably
inclined, minimizing the number of curves and the load losses to
facilitate drainage.
Outside temperature close to zero, the water normally produced during
defrosting of the batteries could form ice and make slippery pavement
near the place of installation of the unit.
II.6.9 PROTECTING THE UNIT FROM FROST
IMPORTANT!
If the master switch is opened, it cuts the power
supply to the plate exchanger heater and the
compressor crankcase heater. The switch should
only be disconnected for cleaning, maintenance or
repair of the machine.
When the unit is running, the control board protects the water side heat
exchanger from freezing by triggering the antifreeze alarm, which stops
the machine if the temperature of the sensor fitted on the heat
exchanger reaches the set point value and simultaneously maintains
the circulation pump active.
With the unit OFF but powered, if the water sensor on the outlet of the
heat exchanger detects a temperature lower than the antifreeze set-
point, it activates the circulation pump and the antifreeze resistance of
the heat exchanger and any pump heating resistance (RAE) accessory,
if present.
IMPORTANT!
When the unit is out of service, drain all the water
from the circuit.
If the draining operation is felt to be too much trouble, ethylene glycol
may be mixed with the water in suitable proportions in order to
guarantee protection from freezing.
IMPORTANT!
Mixing the water with glycol modifies the
performance of the unit.
The use of ethylene glycol is recommended if you do not wish to drain
the water from the hydraulic system during the winter stoppage, or if the
unit has to supply chilled water at temperatures lower than 5°C The
addition of glycol changes the physical properties of the water and
consequently the performance of the unit. The proper percentage of
glycol to be added to the system can be obtained from the most
demanding functioning conditions from those shown below. Table "H"
shows the multipliers which allow the changes in performance of the
units to be determined in proportion to the required percentage of
ethylene glycol.
SECTION II: INSTALLATION AND MAINTENANCE
The multipliers refer to the following conditions: condenser inlet air
temperature 35°C; chilled water temperature 7°C; temperature
differential at evaporator 5°C. For different functioning conditions, the
same coefficients can be used as their variations are negligible.
Table "H"
Glycol in weight
Freezing
temperature °C
fc QF
fc P
fc Opw
fc G 1,008
fc QF = Cooling capacity correction factor.
fc P = Correction factor for the absorbed electrical current.
fc Opw = Correction factor of the pressure drops in the evaporator.
fc G = Correction factor of the glycol water flow to the evaporator.
II.7

ELECTRICAL CONNECTIONS

DANGER!
Always install a general automatic switch in a
protected area near the machine, which has a
characteristic delayed curve, sufficient capacity and
breaking power. There must be a minimum distance
of 3 mm between the contacts. Earth connection is
compulsory by law to ensure user safety while the
machine is in use.
DANGER!
The electrical connection of the unit must be
carried out by qualified personnel, in compliance
with the regulations applicable in the country where
the unit is installed. Non-conforming electrical
connections releases HITECSA from liability
concerning damage to objects and persons. In
making the electrical connections to the board,
cables must be routed so that they do not touch the
hot parts of the machine (compressor, flow pipe
and liquid line). Protect the wires from any burrs.
IMPORTANT!
For the electrical connections of the unit and
accessories, refer to the relative wiring diagram.
The safety door interlock automatically prevents electric power being
fed to the unit if the cover panel over the electrical panel is opened.
After opening the front panel of the unit, feed the power supply cables
through the cable clamps in the external panelling and then through the
ducts at the base of the electric board.
The electrical power supplied by the single-phase or three-phase line,
must be taken to the main isolator switch. The power supply cable must
be flexible with a polychloroprene sheath not lighter than H05RN-F: for
the section, refer to the following table or wiring diagram.
Cable section
Line Section
PE section
Sectioncontrolsand remote controls
The earth conductor must be longer than the other conductors in order
to ensure that if the cable fastening device should become loose, it will
be the last to be stretched.
II.7.1.1 Remote management through connections
prepared by the installer
The connections between board and switch or remote light must be
made with the screened cable consisting of 2 twisted 0.5 mm² wires and
the screen. The shield must be connected to the earth screw on the
panel (on one side only). The maximum distance allowed is 30 m.
SCR - Remote ON/OFF control selector.
SEI - Summer/winter selector.
LBG - General lockout light.
47
10 % 15 % 20 % 25 %
-5 -7 -10
0,991 0,987 0,982 0,978
0,996 0,995 0,993 0,991
1,053 1,105 1,184 1,237
1,028 1,051 1,074
236
mm² 16
mm² 16
mm² 1,5
30 %
-13 -16
0,974
0,989
1,316
1,100
245-
260
250
16 25
16 25
1,5 1,5