Section 11: Commissioning
Page 50
11.3.3 Primary Heat Exchanger
To gain access to the top of the heat exchanger:
•
With hinged hopper lid open and top access cover removed (as
per Section 11.3.1)
•
Shut off the cold water supply to wash system.
•
Disconnect the water supply hose from the wash system. Refer
to Figure 12-2.
•
Unscrew and remove the five nuts (and washers) securing the
heat exchanger cover and remove it from the top of the heat
exchanger. Refer to Figure 11-7.
•
Check that the spiral baffles in the heat exchanger are all in
place. Lift and drop each one to check all are free to move in
their respective tubes. Refer to Figures 11-8.
Figure 11-7:
Heat exchanger cover and Lambda sensor position
Figure 11-8:
Primary heat exchanger spirals
11.3.4 Secondary Heat Exchanger
there are two different types of spiral baffle fitted to the
secondary heat exchanger.
the spiral baffles fitted to the right hand side have a 2½ turn
spiral and are different to those on the left hand side which
have 4½ turn spiral.
Whenever these are removed, it is important that they are re-
fitted in the correct side of the secondary heat exchanger.
nOtE
!
With the hinged hopper lid open and both top access cover and heat
exchanger cover removed (as per Section 11.3.3).
•
Check that the spiral baffles in the secondary heat exchanger are
all in place.
•
Check that all spiral baffles are correctly aligned with the top
edges running ‘front to back’. Refer to Figure 11.9.
•
Refit the heat exchanger cover to the top of the heat exchangers
and secure with the nuts previously removed. Do not over tighten
•
Re-connect water supply hose to connection on wash system
manifold. Refer to Figure 12-2.
Figure 11-9:
Secondary heat exchanger spirals
11.3.5 Boiler Pellet Hopper
if the optional side pellet store is fitted, the operation of the
side pellet store auger MUSt be checked BEFORE filling the
boiler pellet hopper. Refer to Section 10.5 for details.
nOtE
!
•
Before filling the boiler pellet hopper with pellets for the first
time, ensure that hopper is empty of all other debris or objects,
e.g. screws, nuts, etc.
!
CaUtiOn
Check that the pellet hopper is full of pellets. Fill the hopper with
pellets by hand from bags. Ensure that only EN Plus Grade A1
pellets, that comply with BS EN ISO 17225-2:2014, are used with
the Grant Vecta boiler. Refer to Section 3 for details.
Lambda sensor
