Daikin VAM-FA8VE, Technical Data Manual

Page: 143 / 282

• HRV • Heat Reclaim Ventilation
141
• HRV • VAM-FA8VE
1
10
10 Installation
10-3 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.
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.
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.
Note:
If the outdoor discharge air exceeds 95% RH, please preheat
the outdoor suction air before it goes through the heat
exchanger.
Such operation may cause frost to form in the body and dirty
ceiling may result.
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.
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.
RA
SA
OA
95% RH
<=
(HC0067)
Temperature efficiency A%
Dry bulb temperature ( CDB)
A
b
so
lu
te
h
u
m
id
it
y
(k
g
/
k
g
)
En
th
alp
y
ef
fic
ie
nc
y
in
co
ol
in
g
B%
Sa
tu
ra
tio
n
cu
rv
e
20
40
50
60
70
80
90
100
30 40
(HC0068)
Not
available
Available
O
u
td
o
o
r
a
ir
r
e
la
ti
ve
h
u
m
id
it
y
(%
R
H
)
Outdoor air temperature ( CDB)
Indoor conditions
25 C DB, 60% RH
22 C DB, 50% RH
22 C DB, 60% RH
RA
OA
EA
95% RH
<=
(HC0069)
Temperature efficiency A%
Dry bulb temperature ( CDB)
A
b
so
lu
te
h
u
m
id
it
y
(k
g
/
k
g
)
En
th
alp
y e
ffi
cie
nc
y
in
he
ati
ng
C%
Sa
tu
ra
tio
n
cu
rv
e
(In heating)
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.
10. When a unit is installed on the ceiling using short
suspension bolts, abnormal noise may be generated
due to resonance with the ceiling.
(HC0070)
Ceiling
HRV units
body
Vibration
isolating rubber
Vibration isolating
rubber
(HC0071)
Motor mount
Motor Motor