69
10.3.3 Heat Exchangers
•
Shut off the cold water supply to
the wash system.
To gain access to the top of both heat
exchangers:
•
Remove the boiler top casing
panel.
•
Unscrew and remove the two nuts
(and washers) securing the front
access cover and remove it from
the primary heat exchanger. Figure
10-3.
•
Unscrew and remove the two
nuts (and washers) securing the
rear access cover and remove it
from the secondary (condensing)
heat exchanger. The wash system
manifold is attached to a length of
flexible hose and does not need to
be detached to lift.
•
Check that the spiral baffles in the
primary heat exchanger are all in
place. Lift and drop each one to
check all are free to move in their
respective tubes.
•
Check that the spiral baffles in the
secondary heat exchanger are all
in place and are all aligned with
the top edges running ‘front to
back’.
Secondary Heat Exchanger
•
Check the two jet sprays are not
blocked.
•
Refit the rear access cover only
and secure with the nuts (and
washers) previously removed. Do
not over tighten.
•
Turn on the cold water supply to
the wash system.
Test the automatic cleaning functions
as follows:
•
Set the
ON/STANDBY
switch to
STANDBY
.
•
Switch on the electrical supply to
the hopper and boiler. The burner
fan should briefly run.
•
Press and hold down the
‘
CLEANING
’ switch, on the
boiler control panel, in the ‘
TEST
’
position.
•
Release switch to automatically
reset cleaning function back to
‘
AUTO
’.
•
Note that setting this switch to
‘
TEST
’ does NOT operate the
burner cleaning function, but only
that of the two heat exchangers.
Primary Heat Exchanger
•
Check the shaker unit (located
in the top of the primary heat
exchanger) is operating freely and
that the spirals are moving up and
down with two intermittent vertical
motions.
•
Refit the front access cover and
secure with the nuts (and washers)
previously removed. Do not over
tighten.
10.4 Pellet Hopper
Check the pellet feed auger is fully
inserted into the pellet hopper and
secured with the single screw through
the auger fixing flange. Refer to Figure
10-4.
Do NOT fill hopper with pellets
until AFTER the auger is fitted and
secured.
Ensure that only pellets that comply with
EN Plus Grade A1 standard, to BS EN
17225-2:2014, are used with the Grant
Spira boiler. Refer to Section 3.
Fill the hopper with pellets either:
• By hand from bags, or
• Automatically from a bulk pellet
store, via a bulk auger or Grant
SpiraVac vacuum pellet feed
system.
When using a Grant SpiraVac system,
refer to the Installation instructions
supplied with the Grant SpiraVac
vacuum pellet feed system.
10.5 Safety Device Checks
Figure 10-3:
Front and rear access
covers
Figure 10-4:
Auger fixing
Ensure that fingers are clear of all
moving parts inside the top of the
primary heat exchanger BEFORE
operating ‘CLEANING TEST’ switch.
!
WARNING
Before filling the pellet hopper for
the first time with pellets, ensure
that hopper is empty of all other
debris or objects, e.g. screws, nuts,
etc.
!
WARNING
This procedure involves
disconnecting a live mains
connection. Do NOT insert any item
into the opening of the moulded cap
on the end of the thermostat lead.
WARNING
!
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