Daikin Modular L Smart, Service Manual

Page: 11 / 90

ESIE19-06 | Part 1. Introduction 1.3. General operation
21/01/20 | Version 1.1 Page 11
Modular L Smart
1.3. General operation
• The heat reclaim ventilation units (HRV), model name Modular L Smart, is used to supply outdoor air into the building. The
HRV unit is compliant with EN308 regulation according to Lot 6 Ecodesign requirements.
• To reduce the cooling/heating load in the building, the HRV unit can limit the extra load when supplying outdoor air when HRV
unit is set into automatic control.
• The HRV unit contains a high efficiency heat exchange element constructed from high efficiency aluminium. The heat
exchange unit recover sensible heat by a cross flow pattern.
• From the user interface, the operation mode can be set to automatic control, fixed bypass or fixed heat exchange. When
outdoor air temperature drops below +°5C, HRV unit will operate forced in heat-recovery mode.
• The automatic control logic uses air thermistor on the outdoor air intake and the indoor air return side, to control a damper to
set unit into heat recovery or bypass the air return. The main purpose is reduce the capacity need to cool down (when return
air is higher than set value) or heat up (when return air is lower than set value).
• When the HRV unit is equipped individually with a user interface, the operation mode cooling or heating is set by outdoor air
intake temperature.
• When the HRV unit is wired in group to VRV or Sky Air indoor (so on same P1P2 bus), the DX indoor will set the operation
mode cooling or heating on the HRV unit.
• The control can operate the fan motor speed according to required ESP setting (15 steps). The proportion of air volume
between air supply and air return can be altered in fresh-up operation. The fresh air operation can be set by field setting or
voltage free contact input.
• The control can perform a filter contamination check using pressure differential switches.