Daikin VAM-FA Technical Data Manual page 54

13 Installation
13 - 4 Cautions
1) Operation in highly humid areas (in cooling mode)
To prevent dew formation, use the unit under the condition that the
indoor discharge air is 95% RH or less on the psychrometric chart.
1
13
Fig.1 shows the limit under normal indoor conditions.
Fig.1 Conditions:
Temperature efficiency A = 72%
Enthalpy efficiency B = 56% (In cooling)
This conditions are at the minimum efficiency that are the
severest to dew formation.
100
90
80
70
Available
60
50
40
20
Outdoor air temperature (
2) Operation in cold areas (in heating mode)
To prevent dew formation and freezing, use the unit under the
conditions that the outdoor discharge air is 95% RH or less on the
psychrometric chart.
OA
(In heating)
Temperature efficiency A%
52
• Heat reclaim ventilation • VAM-FA/FB
OA
SA
RA
Temperature efficiency A%
Dry bulb temperature (
Not
available
Indoor conditions
°
25 CDB, 60% RH
°
22 CDB, 50% RH
°
22 CDB, 60% RH
30 40
°
CDB)
RA
EA
°
Dry bulb temperature ( CDB)
• Ventilation • Heat reclaim ventilation
Note:
If the outdoor discharge air exceeds 95% RH, please preheat the
outdoor suction air before it goes through the heat exchanger.
8. Do not use HRV units where the air contains noxious
gas and corrosive components of materials such as
acid, alkali, organic solvent, carbon black and paint.
Also, do not use in a place where damage from sea
wind and hot spring prevail or where air containing odor
is recovered for supply to other locations.
9. Do not operate HRV units in [Bypass] ventilation mode
when the indoor is heated during winter.
°
CDB)
Such operation may cause frost to form in the body and dirty ceiling may
(HC0067)
result.
10. When a unit is installed on the ceiling using short
suspension bolts, abnormal noise may be generated
due to resonance with the ceiling.
Provide resonance preventive measures for the body suspension bolts.
Example
If abnormal noise is suspected generating from a spiral duct connection,
change the duct to flexible duct. The above preventive measure is
considered to eliminate the problem (resonance) but contact our service
group and provide means to prevent vibration or necessary changes of
the motor of the unit body.
(HC0068)
Caution
• When the outdoor air infiltrates into the ceiling and the temperature
and humidity in the ceiling become high, insulate the metal part of the
unit.
(HC0069)
Ceiling
HRV units
body
Motor
Motor mount
Vibration
isolating rubber
(HC0070)
Motor
Vibration isolating
rubber
(HC0071)