
Reznor, Guardian GB GR and GS, Installation Manual, EN 2020-06, D30121 Iss B Page No 19
I
Wiring diagrams.
NOTE External switch inputs (e.g. Timer) to be volt free and wired via normally open contacts to
terminal pair marked e.g. ‘timer’ (contacts closed to enable). Remove relevant factory fitted jumper
for any optional input.
Installer wiring - Ambient models, single phase
N
L
E
CONTROL BOARD
(located in air curtain)
CHASSIS
EARTH
N
L
E
3 4 5 6
1 2 3 N
FAN
1 2
3 4
ON
Comms RS485
EXT
DOOR
PIPE COLD
AIR RETURN
STAT
TIMER
FILTER
FAN 0-10v
FAIL O/P
VALVE 0-10v
AIR OUTLET
Ext Timer
(BMS)
Door Switch
Ext Temp
Sensor
J1
J2
Programmer
Keypad
SELECT
RJ45 Cable
230v 50Hz
MAINS SUPPLY
Factory Connections
Installer Wiring
900698 Guardian Series Ambient - Installer Connections
1 2
Violet
Yellow
Red
Green / Yellow
Brown
Blue
Figure 20 Wiring diagram ambient
Terminal
Description
Cable
N
Neutral
1.5mm²
L1
Phase 1 (or 1 Phase
supply)
E
Mains earth
Timer BMS (J1)
Optional external
switch
Door (J2)
Optional door contact
Ext
Optional external sensor
PCB Fuses
Rating (A)
F1
T1H (slow blow)
Table 6 Cable specification ambient
Protection
External circuit breaker with the appropriate
rating should be installed for the protection of the
installation.