page no. 26 of 44
NVx Range Users, Installation & Servicing Instructions issue 6.4 Aug 2017.
Model
F - Free Blowing Unit
Fuse Rating (A)
'C' - Centrifugal Unit
Fuse Rating (A)
NVx15
2
3
NVx20, NVx25 & NVx30
2
5
NVx40
3
5
NVx50
3
7
NVx60 & NVx75
5
16
NVx90SF
5
16
NVx120SF & NVx140SF
7
25
Note:
To achieve maximum system efficiency it is
recommended that NVx units are controlled
by an MC200 Fuel Saver unit. Simple room
thermostat and thermostat/time clock control systems will
not provide optimum system efficiency and fuel savings.
Wiring drawings and instructions are supplied with the
respective controller.
External Wiring
The wiring terminals are located inside the electrical box
behind the side door which firstly has to be opened.
The mains supply connections are via a Hylec terminal
block.
Control Circuitry connections are via a 30A numbered
terminal strip. They are:
External Fuses
terminal 1 - 230V Heat Demand
terminal 2 - 230V Main Fan Only
terminal 3* - 0 - 10Volt
(modulating)
terminal 4* - 0V (modulating
negative) OR 230V High Fire
terminal 5 - Lockout indication
230V Output
terminal 6 - Burner reset - Neutral
Switch
* Used where required
t1
t2
t6
t5
L
N
E
