Model
DH2/DV2 75
DH2/DV2 150
DH4/DV4 225
DH4/DV4 300
DH7/DV7 375
DH7/DV7 450
Max GROSS Heat Input
75 kW
150 kW
225 kW
300 kW
375 kW
450 kW
Burner Pressure
5.0 mbar (G20)
Maximum Rating
6.8 mbar (G25)
(Differential Pressure)
2.0 mbar (G31)
Min Gross Heat Input
8.2 kW
16.4 kW
24.6 kW
32.7 kW
40.9 kW
49.1 kW
DV & DV**EX Ranges
Min GROSS Heat Input
5.4 kW
11.0 kW
16.1 kW
21.4 kW
26.8 kW
32.1 kW
DH & DH**EX Ranges
Min GROSS Heat Input
11.0 kW
22.0 kW
33.0 kW
43.0 kW
53.0 kW
64.0 kW
(G31 Only) All Ranges
GROSS Start Gas Rate Input
4.6 kW (G20 & G25) 9 kW (G31)
Burner Pressure At Ignition
5.0 mbar
Design ∆T Across Appliance
50 K
Air Delivery Rate (Maximum)
1.20 m3/sec
2.4 m3/sec
3.6 m3/sec
4.5 m3/sec
6.0 m3/sec
7.2 m3/sec
Air Delivery Fan Motor Size
400V 10A
400V 10A
400V 10A
400V 10A
400V 16A
400V 16A
@ 125ESP
Gas Connection BSP
15
20
25
40
Weight 2 Internal Kg
215
290
450
Weight 2 Outdoor Kg
265
350
520
indicated on the Data Badge/Tech
Specification sheet.
Control cable size should not be less
than 0.75mm2
Gas supply
The Nordair Niche heater is designed for
use with natural gas and prpane. The
gas type for this heater is marked on the
Appliance Data Badge. Check that the
available gas supply is as marked and
within the pressure range given in heater
specification.
Service pipes
The local supplier of gas should be
consulted at the installation planning
stage in order to establish the availability
of an adequate supply of gas. An
existing service pipe must not be used
without prior consultation with the local
supplier of gas.
Meters
A gas meter is connected to the service
pipe by the local supplier of gas or the
local contractor.
An existing meter should be checked,
preferably by the local supplier of gas, to
ensure that the meter is adequate to
deal with the rate of gas supply required.
Installation pipes
Installation pipes should be fitted in
accordance with IGE/UP/1.
Note If a long pipe run is needed to
supply the heater, the line pressure drop
should be calculated before installation
and the supply pipework sized accord-
ingly.
Gas pressure at the heater inlet under
full fire conditions should be at least
17.5mbar (7
”
wg). Gas pressure with
main burner off must not exceed
100mbar (40
”
w.g). The complete
installation must be tested for
soundness as described in IGE/UP/2.
Internal wiring
The amount of interconnecting wiring
will depend on the control system being
used, this will be indicated on the
schematic wiring diagram, with the
minimum connections.
Ambitec controller
The Ambitec controller should be
mounted at a suitable height for easy
access internally within the building,
with an eight core 1.5m2 SWA cable
wired back to the heater control panel.
The room sensor should be mounted at
approximately 1.5m to 1.8m above floor
level, and should not be subject to high
ambient temperatures from local
machinery or air velocities discharging
from the heater. The room sensor
should be wired back to the Ambitec
Controller with a twisted pair screened
cable.
The duct sensor should be mounted in
the discharge head or the extended
ductwork and wired back to the heater
control panel with a four core twisted
pair screened cable.
Ambi-Stat AS1 Time/temperature
controller
The Ambi-Stat AS1 should be mounted
at a suitable height for easy access, but
should not be subjected to high ambient
temperature from local machinery or air
velocities discharging from the heater.
A seven core 1.5mm2 SWA cable
should be wired back to the heater
control panel.
Specification and technical data
truck, with the forks positioned under
the base of the heater, or via a crane
with lifting straps slung under the
base of the unit and spreader bars
between the straps at the top of the
heater to prevent the straps from
exerting any undue strain onto the
heater frame. The external ductwork
from the heater into the building must
be weatherproof and form a water tight
seal to the outlet spigot on the heater.
All ductwork must be ensured that the
external static resistance (EPS) does
not exceed the figure stated on the
data badge.
Where additional controls are used
they should be CE approved items.
Connection Services
Electrical supply
Wiring external to the heater must be
installed in accordance with the IEE
Wiring Regulations and any local
regulations, which apply.
Nordair DH/DV units are supplied for
415V +-6%, 3 phase, 50Hz, neutral
and earth supply, appropriately sized.
The method of connection to the main
electricity supply must facilitate com-
plete electrical isolation of the heater.
The method of connection should be
provided adjacent to each heater in a
readily accessible position.
Sensors should be wired with a twisted
pair screened cable, Beldon Ref 8762
or equivalent.
Main supply cables are to be sized to
suit electrical rating of the heater as