Page No 22 Reznor, Guardian GB GR and GS, Installation Manual, EN 2020-06, D30121 Iss B
C
Optional wiring
At the Installers terminal block, remove the required
jumper(s) and then wire in any external connections
that are required.
External switch (i.e. BMS enable) to be volt free and
wired via normally open contacts to terminal pair
‘TIMER’. (Contacts closed to enable). Remove factory
fitted jumper J1.
• Door switch to be volt free and wired via
normally closed contacts to terminal pair
‘DOOR’. (Contacts open to enable door mode).
Remove factory fitted jumper J2.
• See adjustments and settings on page 25 for
the program panel - Door link settings. Which
provides an alternative fan speed and heat
setting that is activated only when the door link
is open circuit.
• An external sensor, where required, to be wired
to INDIVIDUAL base units to each terminal pair
‘EXT’. Only air curtain(s) wired this way will
respond to the sensor setting.
• Refer to page 25 for the program panel- External
temperature. if the factory supplied optional
external temperature sensor is connected to the
air curtain. If the external temperature is equal
to the set temperature, all air curtains are turned
off. The temperature must then drop to 3°C
below the set temperature before the air curtains
are turned back on.
• Protection. There are two high speed fuses
on the electric model base unit to protect the
switching thyristors for the heater. An external
circuit breaker with the appropriate rating should
be installed for the protection of the installation.
See technical data for the correct MCB
CONTROLLER
Networking
The program panel is connected to the first air
curtain via pre-wired RJ45 cable to the socket in the
first air curtain housing. See figure 25 on page 23
Connect a second RJ45 cable in to the spare RJ45
socket of the first air curtain, and then take across to
one of the RJ45 sockets in the second air curtain.
Further RJ45 cables can be used to connect more air
curtains to the network, up to a maximum of 16 air
curtains can be linked to one program panel.
The RJ45 cable is 10m as standard however it is
available in 2m, 20m, 30m, 50m and 100m lengths.
Maximum length 100m. (Total length
of cable used between program panel
and last air curtain in network).
It is recommended that this control cable is run
separately within its own trunking if possible, to
avoid external interference.
Note: All air curtains connected within the
network system can be controlled under the
user settings of the single program panel.
Air curtain addressing
All air curtains work on an address to communicate
with the program panel and are supplied with an
default address of ‘0’.
Where multiple air curtains exist in a network they
must be re-addressed using a unique address
(0-9/A-F). This is achieved using the 4 way DIP switch
[2] mounted on the control panel base unit PCB
Figure 23 DIP switch position
The program panel will check all addresses on first
power up and this is displayed as the first digit on
the display (in a network set up, all addressees will
be viewed in rotation).
Note: If any address is altered after initial power up
or an air curtain removed after initial installation,
the program panel will also retain the original
address although unable to respond. To remove an
unwanted address follow the details in Power-up
manual reset.
