16
*
055D-140D
*
*
055D-140D
020S-045D
MS
EF
IU
MS
IU
RS
MS
IU
EF
MS
RS
*
IU
HOT WATER COIL
PROTECTION AGAINST FREEZING:
• Use glycol water. GLYCOL IS THE ONLY EFFECTIVE
PROTECTION AGAINST FREEZING.
This kit includes a safety thermostat with a probe located inside the hot
water coil. When the temperature drops below 4ºC, the unit will stop in
order to protect the hot water coil and to prevent the unit from working
with very low evaporating temperatures.
Five wires must be added between indoor and outdoor unit with this
option.
Hot water coil includes regulating valve:
- ON/OFF for standard and multi split.
- Proportional (0-10V).
You must ensure that manual or automatic air vents have been
installed on all high points in the system. In order to drain the system,
check that drain valves have been installed at all low points of the
system.
Location of the hot
water coil once
installed
Water inlet
Water outlet
Support
2.7.- OPTIONS INSTALLATION
ELECTRICAL HEATER
The electrical heater must be supplied from the unit’s
electrical box.
Safety thermostat
Small panel for contactors
and connections
Location of the electrical
heater once installed
Support
A HEATING COIL FROZEN DUE TO LOW AMBIENT CONDITIONS IS NOT COVERED BY THE WARRANTY.
INDOOR UNIT
FREE COOLING
1.- OPERATION
The control compares the values of temperature/enthalpy between outside air and room air by means of the probes; if there is a
negative difference and the safety elements allow (discharge temperature probes) then the control acts on the servomotor, which
opens the outside damper and closes the return damper, allowing cool outside air to enter the room.
The damper is proportionally regulated.
If there is not a great demand for air indoors, it may be enough just to have free cooling to condition the room. If there is a greater
demand for air, the free cooling and the unit may need to be working in different cooling mode stages.
2.- SUPPLY AND INSTALLATION
The free cooling option can be delivered as a packaged system or as a split system.
The mixing section will be delivered with the unit for models 020S to 045D and as a split system for the remaining models.
Return fan section will be delivered with the unit.
Confi guration of free cooling supply:
2. INSTALLATION
Exhaust fan
Flexible duct to be installed by the customer.
Mixing section
Return fan section
*
Mixing and return fan sections can be together or not.
Indoor unit