Nortek RENZOR GUARDIAN GB User manual

MANUAL PART NO. D301299 ISS C
INSTALLATION MANUAL
GUARDIAN GB, GR AND GS
COMMERCIAL AIR CURTAIN RANGE
BS EN ISO 12100:2010 Safety of machinery.
BS EN 60204-1:2018 Safety of machinery. Electrical equipment of machines.
BS EN 55014-1:2017 Electromagnetic compatibility.
BS EN 60335-2-30:2009+A11:2012 Safety. Requirements for room heaters to the following
European CE directives- 2006/95/EC - low voltage; 2014/30/EU - electromagnetic compatibility
Please read this document carefully before commencing installation, commissioning and/or servicing.
Leave it with the end user/site agent to be placed in their premises technical file after installation.
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury or death.
All work must be carried out by appropriately qualified persons.
The manufacturer does not take any responsibility in the event of non-observance of the regulations concerning the connection of the apparatus causing a
dangerous operation possibly resulting in damage to the apparatus and/or environment in which the unit is installed.
SINGLE PHASE ELECTRIC HEATED MODELS ONLY

Contents
General Information (G)
Guardian air curtain range .........................4
General product information.......................4
Health and safety .......................................4
Requirements .............................................5
Clearance distances ....................................5
Electrical ....................................................5
Important notice to installers ......................5
Using this manual ......................................5
Technical Data (TD)
Technical data .............................................6
Fuses .........................................................6
Dimensions. GS Surface mounted models ...7
Clearance distances ....................................7
Dimensions. GR Recessed models................8
Clearance distances ....................................8
Dimensions. GB Bulkhead mounted models 9
Clearance distances ...................................9
Program panel dimensions..........................10
Component layout .....................................10
Installation (I)
Installation .................................................12
Mounting ...................................................12
Electrical supply. .........................................12
Installation process .....................................13
Suspending on drop rods ...........................14
Wall mounting bracket ..............................14
Program panel ............................................16
Optional wiring...........................................16
Networking.................................................16
Wiring diagram...........................................17
Air curtain addressing .................................18
Power-up manual reset ...............................18
Control panel operation (C)
Keypad buttons .........................................18
Operation ..................................................18
Standard settings ........................................19
Engineers settings.......................................19
Door link settings........................................19
Link-group interlock....................................19
All controllers..............................................20
Quick operations.........................................20
Maintenance and
servicing (MS)
Maintenance and servicing..........................21
Inlet foam filter replacement GS..................21
Inlet foam filter replacement GR ................22
Honeycomb outlet replacement .................22
Fault Finding (FF)
Fault finding. ..............................................23
General.......................................................23
Program panel. ...........................................23
Fault codes .................................................24
Spare Parts (SP)
Spare parts. ................................................25
General.......................................................25
Parts Replacement (PR)
Parts replacement. ......................................25
Control panel ............................................25
Heating element ........................................26
Fan deck.....................................................26

Page No 4 Reznor, Guardian 1 Phase Electric Heat, Installation Manual, EN 2021-06, D301299 Iss C
GGuardian air curtain range
General product information
Models
• GS Surface mounted model
• GR Recessed mounted model
• GB Bulkhead mounted model
Three sizes
• 1000mm
• 1500mm
• 2000mm
All electrically heated
The new design allows for quick and easy
access to the control panel and the installers
terminal block, the GS range has two access
panels on the 1000, three on the 1500 and
four on the 2000. The GR has hinged access
panels which can be removed with ease
These models require a single phase (230v)
electrical supply.
All units have fans capable of providing
standard & high capacity air duties.
Units are designed for versatile installation,
options of wall mounted, recessed within a
false ceiling, fitted in a bulkhead, or on drop
rods in front of glass fronted entrances.
A wall mounting bracket is available as an
optional extra. Units can be mounted adjacent
to each other to cover the full door opening
across wider entrances.
All models are supplied with a program panel
and 10m length of RJ45 communication cable.
A 100m cable is available at an additional cost.
The program panel allows the user to control
either a single air curtain, or a network of up
to 16 air curtains.
Easy programming the end users simply select
whether they require the heat on or off, the
required fan setting (1,2 or 3 speed), and the
outlet temperature setting
Options for BMS compatible via Modbus
communication can be linked to optional
external thermostat for proportional control in
various set temperatures
Health and safety
Before installing, carefully read the instructions
and follow the processes explained by the
manufacturer
Check that the temperature ranges given
and those of the location match. The
appliance must be powered with a voltage
corresponding to the value shown on the
rating plate.
Ensure that anchoring points are suitable for
the weight and loading of the product and if
required, add suitable reinforcement to the
anchoring points area.
Installing, programming, commissioning,
and maintenance of these products must
only be carried out by suitably qualified and
trained technicians and in full compliance of
all applicable regulations and current best
practices.
Due consideration should be taken for
workplace safety, risk assessments and waste
disposal.
Any modification of the product may be
hazardous and the manufacturer is not liable
for any damage or injury caused by improper
use

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G
Requirements
Clearance distances
For installation and maintenance clearances,
please see the information on page 8 for the
GS models, page 6 for the GR models and
page 10 for the GB models.
Electrical
For full electrical loadings, please refer to
the technical data section on page 6 of this
manual.
It is recommended that the electrical supply
to the base unit in the air curtain is via
an appropriate switched isolator, fitted in
accordance with the regulations in force in the
country of use and must be via a fused isolator
having a contact separation of greater than
3mm in all poles.
For safety reasons a good earth
connection must ALWAYS be
made to the heater and control
box.
Models have a supply requirement of 230V 1
phase, neutral and earth. Maximum cable inlet
size is 10mm².
Program panel is wired to the control base unit
via a RJ45 pre-wired cable.
Networked air curtain interconnects via a RJ45
pre-wired cable
Important notice to installers
Before installation, check the
local distribution conditions,
supply voltage are compatible.
Installation, assembly,
commissioning, service and
maintenance procedures must
be carried out only by suitable
competent qualified persons.
Unauthorised modifications
to the appliance, or departure
from the manufacturer’s guidance
on intended use, or installation
contrary to the manufacturer’s
recommendations may constitute
a hazard.
Note
To ignore the warning and caution
notices, and to ignore the advice from
the manufacturer on installation,
commissioning, servicing, or use, will
jeopardise any applicable warranty, such
a situation could also compromise the safe
and efficient running of the appliance
itself, and thereby constitute a hazard.
Using this manual
Contained within the text of the manual, the
symbols for ‘Caution’ and ‘Warning’ these are
used to highlight certain points.
Caution is used when failure to
follow or implement the
instruction(s) can lead to
premature failure or damage to
the heater or its component
parts.
Warning is used when failure to
heed or implement the
instruction(s) can lead to not only
component damage, but also to a
hazardous situation being
created where there is a risk of
personal injury.

Page No 6 Reznor, Guardian 1 Phase Electric Heat, Installation Manual, EN 2021-06, D301299 Iss C
TD
Technical data
Data Fan speed Unit 1000E-1PH 1500E-1PH 2000E-1PH
All models
Maximum door width L, M, H m 1.0 1.5 2.0
Maximum mounting height standard capacity L, M m 3.0
Maximum mounting height high capacity H m 4.0
Maximum air volume
L m3/h 1150 1730 2300
M m3/h 1440 2270 2880
H m3/h 1800 2700 3600
Maximum velocity at 0 metre
L m/s 6.4
M m/s 8 8.4 8
H m/s 10 10.1 10
Maximum velocity at 1 metre H m/s 5.6 5.2 5.4
Maximum velocity at 2 metre H m/s 3.8 3.5 3.7
Maximum velocity at 3 metre H m/s 2.8 2.5 2.8
Motor power L, M, H W 365 530 730
Noise level @ 3m free field
L dB(A) 52
M dB(A) 55
H dB(A) 59
Program panel control wiring RJ45 (pre-wired cable required)
Low voltage cable terminal size 1.5mm2MAX
Electric Heat
Electrical supply L, M, H 230V 1 phase 50Hz
Heating capacity L, H kW 6 6 8
Total electrical load (Maximum) A 28.9 28.9 37.6
Max temperature rise
L °C 14 9 9
M °C 11 7 7
H °C 966
Weight kg 34.5 52 64.5
External fuse size (D type MCB) H A 32 32 40
Table 1 Technical data
Fuse
Guardian air curtain control is fitted with a T1H (1A) 5mm x 20mm control circuit fuse.

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TD
Clearance distances
It is recommended that a minimum clearance of 100mm is allowed around the top and front of the
unit. The clearance allows for cable entry and prevents combustible surfaces overheating.
The minimum mounting height (floor to grille outlet) is 1.8m. The recommended maximum
mounting height is 3m for standard fan setting & 4m for high
Dimensions. GS Surface mounted models
Figure 2.2 GS Bottom view
Figure 2.1 GS Front view
Figure 2 GS Top view
Reference GS 1000 GS 1500 GS 2000
1 440
2 1094 1620 2148
3 227
4 70
5 132 130 132
6 830 1360 1884
7 306
8 440
9 >100
Figure 2.3 GS Side view
Table 2 GS dimensions

Page No 8 Reznor, Guardian 1 Phase Electric Heat, Installation Manual, EN 2021-06, D301299 Iss C
TD
Reference GR 1000 GR 1500 GR 2000
1 1125 1650 2177
2 457
3 1060 1584 2111
4 70
5 114 112 114
6 830 1360 1884
7 298
8 438
9 273
Clearance distances
It is recommended that a minimum clearance of 100mm is allowed around the case. The clearance
allows for cable entry and prevents combustible surfaces overheating.
The minimum mounting height (floor to grille outlet) is 1.8m. The recommended maximum
mounting height is 3m for standard fan setting & 4m for high.
Figure 3.2 GR Bottom view
Figure 3.1 GR Front view
Figure 3 GR Top view
Figure 3.3 GR Side view
Dimensions. GR Recessed models
Table 3 GR dimensions

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G
Dimensions. GB Bulkhead mounted models
Figure 4 GB Top view
Figure 4.1 GB Front view
Figure 4.2 GB Bottom view
Reference GB 1000 GB 1500 GB 2000
1 70
2 114 112 114
3 830 1360 1884
4 226
5 1060 1584 2111
6 448
7 1125 1650 2177
8 436
9 300
10 427-487
Figure 4.3 GB Side view
Table 4 GB Dimensions
Clearance distances
It is recommended that a minimum clearance of 100mm is allowed around the case. The clearance
allows for cable entry and prevents combustible surfaces overheating.
The minimum mounting height (floor to grille outlet) is 1.8m. The recommended maximum
mounting height is 3m for standard fan setting & 4m for high.

Page No 10 Reznor, Guardian 1 Phase Electric Heat, Installation Manual, EN 2021-06, D301299 Iss C
TD
Program panel dimensions
The program panel is supplied with an industry standard plastic double surface mounted socket
box. Alternatively, the program panel can be flush mounted using a customer supplied metal flush
conduit box as shown in Figure 5.2
Figure 5 Surface mount box
Figure 5.2 Surface mounting back box dimensions
Figure 5.1 Optional flush mounting using
metal conduit box

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TD
Component layout
Figure 6 Component layout GS
Location Component
1 Control panel
2 Installer terminal block
3 Fan
4 Fan motor
5 Fan deck
6 Resistor (1500 only)
7 Heating element
Table 5 GS & GR components
Figure 7 Component layout GR

Page No 12 Reznor, Guardian 1 Phase Electric Heat, Installation Manual, EN 2021-06, D301299 Iss C
I
Installation
Mounting
Guardian GS,GR and GB air curtain units are
designed to be installed horizontally directly
over the door opening on the inside of the
building, against a wall or ceiling.
Care must be taken to allow
complete free air movement into
the inlet grilles of the unit to
ensure the correct working
operation of the air curtain. The
honeycomb outlet should be as
close to the top of the door as
possible and can be angled
towards the door from 0° to -5°.
Ensure to cover the entire door
width. See figure 8
Units can be mounted adjacent to each other
to cover the full door opening across wider
entrances.
The GS units are designed for
surface mounting and should not
be placed into a ceiling void, due
to possible obstruction of airflow
and difficulty in routine cleaning
and maintenance. Use the GR for
these types of applications
It is the sole responsibility of the
installer to ensure that the points
of attachment to the building are
sound.
Verification with the consultant/
architect or owner of the
building is recommended to
ensure that a sound, stable
installation can be achieved.
Figure 8 Honeycomb outlet position near
to the door adjustable angle of 0 to -5°
Electrical supply.
Units require a connection to 1 phase 230V
power supply only.
Models consume either 6kW (1.0 & 1.5m) or
8kW (2.0m), depending on the model.
The appliance shall be connected to the supply
via an appropriate a switched fused isolator,
having a contact separation of greater than
3mm. See technical data for fuse rating on
page 6
Once the covers have been removed, the
installation engineers terminal block is located
to the right hand side of the unit. This terminal
block is used for the connection of the mains
supply and additional controls, for example
door switch. Wire in accordance to the
diagram in the wiring section, on page 17
For safety reasons, a sound earth
connection must always be made
to the unit before it is put in to
use. The unit should be wired in
accordance with IEE Regulations
for the Electrical Equipment of
Buildings.
The program panel is connected
to the control panel (base unit)
via a pre-wired RJ45 cable
maximum length of 100m. 10m
supplied as standard. It is
recommended that this cable is
run separately within its own
trunking to avoid external
interference.

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Installation process
1. Remove all packaging and covers
Note All outer metal surfaces are covered
by a protective plastic film, which must be
removed before final fixing and operation
of the unit.
2. GS units, Loosen (DO NOT REMOVE) the
screws in the top of each front inlet cover
[1] (see figure 9.1and 10 dog bone slot)
then slide the left cover to the left [2]
which will allow the cover to slide under
the end cap. This will allow the next cover
to be pushed to the left [3] (see figure
9.1) allowing it to be released from the
screw slot [4] by pulling forward and lifted
upwards out of the lower grove in the
case.
3. The first cover can then be pushed to the
right to release it from the screw slot,
(see figure 10) then pull forward and lift
upwards to be removed. For additional
covers fitted on the 1500 or 2000 units
loosen the fixing screws and remove as
with the previous covers.
Figure 9 GS cover fixing point
Figure 9.1 GS cover fixing point
Figure 9.2 GS cover fixing point
Figure 10 Dog bone screw fixing slot
4. On the GS units the lower cover can be
removed by removing the two screws at
the top of this cover and then pulled out of
the tabs from the main case
Figure 11 GS lower access panel
1. The GR has two captive screws in each
panel, loosen these and hinge the panel
down.
2. The panel can be removed completely by
releasing the bolt hinges on either side of
the panel (see figure 13).
Figure 12 GR cover fixing point
Figure 13 GR bolt hinge
1
1
1
1
2
3
4
4

Page No 14 Reznor, Guardian 1 Phase Electric Heat, Installation Manual, EN 2021-06, D301299 Iss C
I
Suspending on drop rods
1. The product is installed using 4 x M10 drop
rods fitted into the fixing points in the top
of casing.
2. The drop rods must completely pass
through the fixing points in the case
without being too long to cause damage
to products inside the case.
3. Ensure that the secure mounting point in
the ceiling is capable of supporting the
weight of the unit.
4. Lift the unit (using lifting equipment) onto
drop rods ceiling fixing point.
Figure 14 Suspending from drop rods
5. Level the unit and tighten the fixing points.
Carryout a final check to ensure the unit
remains level
6. Holes are provided in the casing for cable
entry. Choose the appropriate hole to
suit the installation. Note the terminal
connection block is located to the right of
the unit.
7. Install the cable into the case using a
suitable cable gland for size of cable
8. Two RJ45 ports are located in the case to
connect the program panel and any other
air curtains to be controlled
9. Adjust outlet to required angle to give
desired performance and tighten outlet
grille.
10.Fit the Program panel and commission the
unit
Wall mounting bracket
Figure 15 Wall mounting bracket
Figure 15.1 Side view
Figure 15.1 shows the overall dimensions of
the wall bracket assembly.
Figure 15.2 Front view
Figure 15.2 shows the dimensions of the
bracket that is to be fixed to the wall, along
with fixing positions. Please ensure that
adequate fixings and wall structure are present
to support the unit weight.

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I
Figure 15.3 Mounting bracket top view
Figure 15.3 shows the dimensions of the
bracket section that is to be fixed to the unit
using 4 x M10 x 30mm 8.8 set screws, 4 x
shake prove washers and 4 x flat washers. Use
the four fixing points supplied in the casing
1. Using the details supplied with the bracket
position the bracket against the wall at the
desired mounting height and mark through
the holes
2. Drill the wall then fix the brackets in
position. Lift the chassis (using lifting gear
if necessary) onto drop rods in the bracket
3. Ensure the unit is level and then tighten
the fixing points with a final check to
ensure the unit is level
4. Follow the instructions 6 to 10 of the drop
rod mounting instructions grill.
Figure 16 Mounting bracket option
Figure 16.1 Mounting bracket fitted to GB
Program panel
The program panel can be installed using
the standard double surface box supplied
with the program panel or recessed using a
suitable flush mounted double conduit box.
see “Figure 5.2 Surface mounting back box
dimensions” on page 10 for details
Figure 18 Program panel
The program panel can be connected up to a
maximum of 16 air curtains in one network.
For mains wiring refer to the wiring diagram
on page 17
The program panel is connected to the base
unit in the air curtain via pre-wired RJ45 cable/
plugs. These cables are available in 2, 10, 20,
30, 50 and 100m lengths. It is recommended
that this control cable is run separately within
its own trunking to avoid external interference.
Maximum cable run in any
network must not exceed 100m
in total including program panel
cable.
Note: All air curtains connected within the
network system will operate under the
settings of the single program panel.
Any air curtain within the network can
be connected with and respond to the
following optional circuits:

Page No 16 Reznor, Guardian 1 Phase Electric Heat, Installation Manual, EN 2021-06, D301299 Iss C
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• External switch (ie BMS enable) where
required, to be volt free and wired in
PARALLEL via normally open contacts
to each terminal pair ‘TIMER’. (Contacts
closed to enable). Only air curtain(s) wired
this way will respond to the enable signal.
• Door switches where required, to be
volt free and wired to INDIVIDUAL base
units via normally closed contacts to each
terminal pair ‘DOOR’. (Contacts open to
enable door mode). Only air curtain(s)
wired this way will respond to the door
mode.
• An external sensor, where required, can
be wired to INDIVIDUAL base units to each
terminal pair ‘EXT’. Only air curtain(s) wired
this way will respond to the sensor setting.
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.
• 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.
• If the 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
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 18
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.

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I
Installer wiring - Electric heated models, single phase only
EXT DOOR
STAT
TIMER TEMP
CHASSIS
EARTH
230v 50Hz
MAINS SUPPLY
SMARTELEC
(located in air curtain)
RJ45 Cable
Comms
RS485
Programmer
Keypad
L1NE
External Switch
(BMS)
Door Switch
External Temp
Sensor
J1 J2
Factory Connections
Installer Wiring
900706 Guardian Series 1-Phase Electric - Installer Connections
FAIL O/P
1 2 3 4
ON
SELECT
5 6 1 2 3 4
Violet Yellow
Red
Green / Yellow
Blue Brown
N
L3 HE
B
HE
A
L2 HE
B
HE
A
L1 HE
B
HE
A
2m model only
FAN
1 2 3 N
Figure 21 Wiring diagram electric heated
Terminal Description Cable
E Mains earth
10mm²N Neutral
L1 Phase 1
Table 7 Cable specification electric heated
Protection
There are two high speed fuses on the 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
Terminal Description Cable
Timer/BMS
(J1) Optional external switch
1.5mm²
Door (J2) Optional door contact
Ext Optional external sensor
Fail o/p Fault output (0-5v)
Fan Optional 0-10v fan output
Thermostat Internal high limit
thermostat
PCB Fuses Rating (A)
F1 T1H (slow blow)
Table 7.1 Cable specification electric
heated continued
Control circuit board

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C
Power-up manual reset
The system can be reset by powering-up the
panel whilst holding down the SELECT and -
buttons. The display shows the ‘start’ pattern
but then goes blank.
Release the buttons where upon the
display resumes and the system addressing
commences, finding only those air curtains
which are actually connected and working.
If [E n9] appears on the display, press and
hold the +button for a few seconds then
release. The display will then return to the
normal mode.
Standard and high capacity fan.
All units are supplied as standard capacity
All units have fans capable of providing
standard & high capacity air duties (speeds
Medium and High) which are controlled via the
program panel supplied with every unit.
Control Panel Operation
Keypad buttons
The SELECT button will allow you to navigate.
The +button will allow you to increase the setting.
The - button will allow you to decrease the setting.
Operation
On first power up, the display will show and have
the following default settings:
• F. 0 (no fan)
• H. 0 (no heat)
• 16 (°C. Heat set point)
•
If no Air Curtains are detected the display
will show:
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
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.
Figure 24 Air curtain address numbers.
Figure 25 Wiring of 2 or more networked
air curtains.
Guardian 1
Guardian 2
RJ45RJ45
E ng

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Note: Subsequent power ups will retain any entered
settings in the display internal memory.
In normal operation the display will show for
example:
‘1’ denotes the Air Curtain ADDRESS, and ‘27’
the current outlet temperature. If the display is set
to ‘H1’ (half heat) then the display unit will show:
The ‘dot’ after the Air Curtain number denotes heat
setting 1. If the display is set to ‘H2’ (full heat) the
display unit will show:
The ‘dot’ after the temperature number denotes
heat setting 2. If an external temperature sensor is
fitted then the display shows:
The small ‘zero’ shows a sensor detected and it’s
current temperature reading.
Standard settings
Press the SELECT button. This will cause the display
to brighten and display Air Curtain number and it’s
fan speed eg.
Press the +or -buttons to increase/decrease the
desired setting between F0, 1, 2, or 3.
Pressing the SELECT button again will display the
Air Curtain number and it’s heat setting eg.
Press the +or -buttons to increase/decrease the
desired setting between H0, 1, or 2.
Pressing the SELECT button again will loop back
to start if only one Air Curtain is connected to the
display unit. If there is more than one connected
the display unit will then show the settings for the
next Air Curtain in the network and so on.
Engineers settings
To turn on the engineers settings press and
hold the +button until the display goes blank
then press SELECT the button. The display unit
will now display ’Eng’ briefly.
This will disappear after a period of 10 minutes of
inactivity on the keypad.
On pressing the SELECT button the display unit
now works in the same way as standard for the fan
and heat settings, but then an adjustable control
temperature setting appears (if external sensor
fitted).
This control works by reading the temperature at
the sensor and comparing it to the set point. The
temperature is then controlled by automatically
switching the controller outputs between H0, H1,
and H2, thus maintaining reasonable heat control .
Pressing the SELECT button again advances to the
door link settings.
Door link settings
Two settings are available for use when the door link
circuit terminals are open circuit (PCB link removed).
The first of these is displayed as:
‘1’ is the Air Curtain address and ‘d2’ denotes fan
speed 2.
Press the +or -buttons to increase/decrease the
desired setting between d0, 1, 2, or 3.
The second is displayed as:
‘1’ is the address for the Air Curtain and ‘t1’ denotes
heat setting 1. Press the +or -buttons to increase/
decrease the desired setting between t0, 1 or 2.
Pressing the SELECT button again advances to the
link group interlock settings.
Link-group interlock
If more than one Air Curtain is connected to the
display then there are two sets of interlocks avail-
able to enable a single Air Curtain in a group to be
the ‘master’ controller based on links used.
‘1’ is the Air Curtain address and ‘C0’ is the default
setting (no interlock set). Press the +or -buttons to

Page No 20 Reznor, Guardian 1 Phase Electric Heat, Installation Manual, EN 2021-06, D301299 Iss C
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increase/decrease the desired setting between C0,
or 1-7 (see Table 26). If the Air Curtain is set to eg.
This denotes that Air Curtain ‘1’ is set to be the
master for door and BMS interlocks. If interrogated
all other Air Curtains will then display eg.
This denotes a unit that is not the master.
“C” interlocks setting Effect
1 Timer/BMS interlock
2 Door interlock
4 Thermostat interlock
“L interlocks setting Effect
1 Not used
2 Not used
4 Block filter interlock
To set more than one interlock, add the appropriate
numbers together, eg. ‘C3’ above works on timer
and door interlocks.
CAUTION
If a controller is not the master, all three
interlock links must be in place.
All controllers
This setting can be accessed from the engineers
settings whilst the external temperature indication
is showing. This is displayed as:
This allows a single group of settings to be copied
to all controllers in a network. Individual settings
can still be used at a later date if required.
Quick Options
Immediate turn off:
Press and hold the -button for two seconds, the
display will go blank then the Air Curtain(s) will
turn off.
Re-scan/engineers mode:
Press and hold the -button for two seconds, the
display will go blank, then press SELECT. The display
will show the controller type in the first digit and
the number of Air Curtains in the fourth digit.
Release both buttons and then press any button
to continue, the panel is now in Engineers mode.
Turn on engineers mode:
Press and hold the +button for two seconds, the
display will go blank, then press SELECT the display
will show ‘Eng’, release both buttons.
Turn off engineers mode:
Press and hold the +button for two seconds, the
display will go blank, then release.