42
Ensure there is enough air
fl
ow to supply the heat exchanger, taking into account down draughts caused
be applied where turbulence disturbs air inlet. Walls should be lower than unit height.
Distance between short walls or louvres to unit should sa sfy requirements of unit
installa
.
ti
n
u
d
n
u
o
r
a
g
n
i
c
a
p
s
m
u
m
i
n
i
m
n
o
If the unit runs in winter, and the loca on has accumulated snow,
this should not obstruct airflow
If the unit is installed in the basement, ensure air around the unit and outdoor air can circulate without
obstru on.
by adjacent tall buildings when installing.
to heat exchanger unit.
2.6 Water pipeline system
Water pipe joint specifications of single unit.
Table 3-2.1: Water pipe joint specifications for single unit
Model
Water inlet pipe joint
Water outlet pipe joint
ALLWH200R410
DN25
DN25
ALLWH420 R410
DN32
DN32
ALLWH800R410
DN50
DN50
Water pipeline system design and constru
cti
on must comply with na
ti
onal water and hea
ti
ng pipeline
design requirements and standards.
It is recommended to use PPR piping, and PPR pipe specifications are referred to in table above.
Dust and contamination must be prevented from entering into the piping system during installation
and connec
ti
on.
The water
fl
ow switch which is used to detect the circula
ti
ng water
fl
ow
v
olume should
b
e
provided on
site. The cut-o
ff v
alue o
f
water
fl
ow switch must not
be le
ss than (0.1m3/h×amount
of
units).
Only once unit is fixed in position, can water pipes be installed.
Use thermal insula
ti
on material to wrap the inlet water pipe, outlet water pipe and circula
tiv
e water
pipes.
The pipe diameter
of
main water pipes:
Table 3-2.2: Water pipe joint specifications for multi units
ALLWH200R410
Amount of units connected in parallel
Water inlet pipe joint
Water outlet pipe joint
1
DN25
DN25
2
DN32
DN32
3-5
DN50
DN50
6
DN65
DN65
MCAC-HTSM-201801 Alliance R410A Direct Heating Type HPWH 50Hz Technical Manual