Page No 36 Reznor, Guardian GB GR and GS, Installation Manual, EN 2020-06, D30121 Iss B
SP
Parts replacement.
Warning
Ensure electrical power is isolated from
the product.
For access follow steps as stated in Installation Section on
page 14
1. GS units, remove all of the front covers, remove the
cover plate to access the control panel, installers
terminal block, transformer and fan deck (motor and
fans).
2. GR units, completely remove the inlet panel
Control panel
Make a note of the wiring at the control
panel. Make a note of the dip switch
settings
Make a note of the installer terminal block wiring
1. Disconnect the wires from the control panel terminals
including the earth connections which are bolted to
the chassis.
2. Disconnect the installer terminal block assembly by
removing the two screws securing the block bracket
to the control panel mounting plate
3. Remove the control panel, this is secured by two
screws in the control panel mounting bracket situated
to the top of the bracket furthest away from the
honey comb outlet grille.
4. With the control panel out of the unit disconnect
the blue wire [1] from the temperature sensor, see
figure 33 for the location. Unscrew the eight screws
securing the control board to the heat sink and
mounting plate and lift off
5. Replace the control board and reverse the steps
remembering to reconnect the temperature sensor
wire which goes through the hole in the PCB
6. Reverse the steps to install the new control panel
Set the dip switch [2] of figure 33 for the location
and follow the networking address settings. For more
information see page 22.
Heating element
1. Follow steps to remove the covers
2. Remove the fixing bolts holding the honey comb
outlet grill assembly and remove this.
3. Make a note of the wiring at the control panel for the
heating element and the temperature sensor
Figure 33 Control panel temperature sensor and
dip switch location
4. Disconnect the wires at the heating element to the
control panel
5. Remove the fixing bolts in the fan deck mounting
plate which secures the heating element.
6. Remove the heating element
7. Make a note of the wiring to the heating element
including all the jumper positions
8. Remove the wires and fit to the new element pass
them through ready for connection to the control
panel
9. Refit the heating element and reverse the steps to
install the new heating element
10. Ensure the temperature sensor is refitted in
the correct position and wired into the TEMP
terminal of the control panel, see figure 30 and
table 9 on page 32
Fan deck
1. Follow the steps to remove the covers and
the control panel, complete with its mounting
bracket as one of the fan deck securing nuts are
under the control panel bracket.
2. With the control panel and bracket out of the
unit disconnect the wire from the motor
3. Remove the wires to the thermal cut out sensor,
(two sensors on the 2 metre units) and remove
the thermal cut out.
4. Remove the four securing nuts, shake proof
washer and flat washer that secure the fan deck.
5. Lift out the fan deck
6. Replace the deck and reverse the steps to install
the new fan deck
