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4.5 Ducted
Heaters
4.5.1 The Ambi-Rad ducted cabinet heater is
designed to be used with discharge ducting. A
positive seal should be made between any
ducting and the air heater. A flexible
connection is desirable to eliminate
transmission of noise and to take account of
thermal expansion.
4.5.2 Consideration should be given to the
application of duct fittings directly connected to
the appliance. Air outlet elbows, transitions
etc. should be designed to ensure an
unrestricted and turbulent free air flow. This
requirement is to ensure than an even air
temperature is maintained when leaving the
appliance thus eliminating heat exchanger
“hot-spots” and nuisance shut-down of the
burner due to over heating.
4.5.3 Figures 8 and 10
illustrate the principle and
the method of fixing duct channels to the
heater
-
ducts must have adequate duct flanges to fit
into the frame structure of the heater
-
the dimensions DA1/DA2/DA4/DA4 refer to
the duct flange; the dimensions
DB1/DB2/DB3/DB4 refer to the duct itself
-
duct flanges must be screwed to the frame
structure; holes are provided in the frame
Remark
: fig. 10 shows ducted air inlet fixation – same
fixation method applies for ducted air outlet
Figure 10
DB
4
DB3
DA
4
DA3
Attention must be given to the motor load when
applying discharge ducting. Duct outlets must be
adjusted when necessary to meet the values
mentioned in table 9
.
Table 9
Frame Model Nominal
airflow
Available outlet
static pressure
Motor load
(maximum)
Motor current
normal use (*)
Voltage
m³/h Pa
(A)
(A)
(V)
Standard airflow conditions
I
100/150
2500
95
4.00
3.4
230V – 1N
II
200/300
5180
130
9.00
7.8
230V – 1N
400
7140
125
3.20
2.3
400V – 3N
III
500
8750
150
5.08
3.7
400V – 3N
600
10500
200
6.60
5.4
400V – 3N
IV
700
12800
250
8.50
8.4
400V – 3N
800
14100
160
9.00
7.0
400V – 3N
V
1000 17330
250 11.50
11.0
400V – 3N
High airflow conditions (when option 403 is applied)
Frame III
400
8750
150
5.08
3.7
400V – 3N
Frame IV 600
12800
250
8.50
8.4
400V – 3N
Frame V
800
17330
230
11.50
11.0
400V – 3N
High outlet static pressure conditions (when option 404 is applied)
Frame III
400
7140
205
5.08
3.7
400V – 3N
Frame IV 600
10500
350
8.50
8.4
400V – 3N
Frame V
800
14100
330
11.50
11.0
400V – 3N
(*)
Current is measured in cold air conditions (heating off) while unit is working at standard airflow. However, measuring
motor current of 10% lower than the figures mentioned in table 9, means that the airflow will be lower and the
∆
T higher.
In this case overheating can occur. To avoid this problem, larger outlets must be provided. In case motor current is
greater than the maximum motor load (mentioned in table 9) duct outlet openings must be decreased so that motor load
becomes lower.
We strongly recommend respecting the figures given in table 9.
