8
22. 04. 21. Document Number 671506
Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA | nuaire.co.uk
BESPOKE BOXER
Installation Manual
4.1.3 BMS Differential Pressure Switch
An external power supply delivering 10-35 VDC with a minimum
current capability of 40ma must be used to power the control loop in
which the PDGAUGE2/BMS is connected.
If the receiver requires a 1-5 volt input, insert a 250 ohm, 1/2 watt
resistor in series with the current loop but in parallel with the receiver
input (Figure 14). RL becomes the 250 ohm resistor and point X and Y
are connected to the receiver input, point X being positive (+) and point
Y negative (–) or ground.
14
BMS Differential Pressure Switch Wiring
PDGAUGE2/BMS
POWER
SUPPLY
10-35 VDC
RECEIVER (RL)
NOTE: RECEIVER MAY BE IN SERIES WITH
+ OR - LEG OF CONTROL LOOP
RL MAX = V
X
Y
-
+
-
+
PS
- 10.0V
20 mA DC
MAXIMUM VALUE (1250)
Mandatory Customer Connection
Optional Customer Connection
Key:
4.1.4 Bulkhead Lights
Lights are designed for permanent connection to fixed wiring. This
should be either a suitable lighting circuit (protected with a 5 or 6 Amp
MCB or fuse) or a fused spur (with a 3 Amp fuse) via a fused connection
unit.
15
Bulkhead Light Wiring
COM
1
2
EARTHING
N
LOOP
L
L
N
EARTH
FROM
LIGHT
TO
INTERNAL
LIGHT
Internal Factory Connection
Mandatory Customer Connection
E
Mains
230V
50Hz
Key:
4.1.5 Electric Heater Wiring
For models with electric heating, the heating circuit is powered by a
higher current, 400Vac 50Hz 3 phase & Neutral supplies. This must be
isolated to the unit and fitted with appropriate overcurrent protection.
The main supply is still required. Electric heater elements are protected
by a fail-safe over-temperature switch which will disconnect the heater
supply if a temperature of 80°C is reached. Once the elements cool, the
switch will reset but a power cycle is required to reset the heater supply
contactor.
16
Typical Electric Heater Wiring
E
1
2
3
N
AIR-FLOW PROVING SWITCH
PIPED TO OUTSIDE
Internal Factory Connection
Mandatory Customer Connection
BR
O
W
N
G
REY
BL
UE
L1
L2
L3
STAR POINT
NO NEUTRAL CONNECTED
2A
2
1
3
4
5
6
N
L
C1
MANUAL RESET
OVER-HEAT
CUT-OUT
L1 L2 L3
AUTO RESET
OVER-HEAT
CUT-OUT
3
5
1
2
6
4
PUSH
TO RESET
HEATER
E
EARTH BOLT
BL
AC
K
BR
O
W
N
BROWN
0-
10
V
0V
REMOTE
START
SIGNAL
FUSED 400V
POWER SUPPLY
FROM LOCAL ISOLATOR
SCREENED
TEMPERATURE
CONTROL INPUT
HEATER TRIPPED
VOLT-FREE SIGNAL
CLOSED = HEALTHY
OPEN = TRIPPED
1 2 3 4
L1 LO
AD
1
L2
L3
/L
O
AD
3
LO
AD
2
TH
Key:
4.1.6 Thermal Wheel
The thermal wheel incorporates a purge section and is fitted with a
rotational drive. Any temperature sensors and enabling signal are to be
provided by others.
A frequency converter with a modular design is used as the control
unit; it can adjust the speed of three-phase motors. The control unit is
delivered ready for operation with the factory-set parameters. Various
settings can be changed with an optionally available operating unit.
Error messages can be read out directly at a flashing LED.
The power unit is protected from under voltage, over voltage or
non-approved converter temperature.
Recommended tightening torque on terminals 0.5 Nm; maximum
tightening torque 0.8 Nm.
MicroMax370
Output
Motor
Side
Maximum motor power
kW
0.37
Nominal output current
A
1.9
Maximum output voltage
V
3 x 0-230
Output frequency
Hz
(Fixed)4...40-100/150
Mains
Input
Rated voltage
V
1x230-240 +/-15%
Mains frequency
Hz
50/60
Fuses
A T
10
General
Data
Protection rating
IP54
Ambient temperature
°C
-20…45
Air humidity
kg
1.1
Dimensions
H x W x D
mm
198 x 164 x 60
