INSTALLATION AND OPERATION INSTRUCTIONS
4-6
VFC 15-150, VFC 45-225 MODULATING GAS BOILERS
GAINING ACCESS TO COMBUSTION
CHAMBER, BURNER REMOVAL
INSTRUCTIONS; FAN AND GAS
VALVE REMOVAL INSTRUCTIONS
The installer or service technician can select from three separate routes to gain
access to the burner and heat exchanger:
1.
The base method involves removal of the aluminum Fan Coupler (FC) while
leaving the fan and gas valve in-place:
a.
Ensure boiler cools down to ambient temperature. Do not drain the boiler
unless freezing conditions are expected during this procedure.
b.
Remove the front cover. No tools are required. A ladder or step may be
required to have a clear vertical view of the work area. Do not attempt
to reach from the front without a clear view, as damage to connectors,
screws or refractory may occur.
c.
Ensuring the power and gas are shut off, disconnect the ignitor cable and
ground wire from the ignitor
d.
Remove the two screws that secure the ignitor to the lid using a # 2
Phillips screwdriver. Carefully remove the ignitor by sliding it straight up.
e.
Remove the ignitor gasket and place parts on a clean dry area.
f.
Release the v-clamp, taking care to preserve its gasket for possible reuse.
g.
For the VFC 15-150, remove the 4 x 6mm hex socket bolts at the FC:
Fan interface. Three of the 4 bolts are easily dealt with using a regular
6mm Allen key, while the upper (rear) fastener is in a confined space;
start turning with the wrench then complete the job using needle-nose
pliers and/or fingers. This task is best done using a 9” tee-handle hex
key. For the VFC 45-225, remove the 4 bolts and nuts at the FC:Fan
interface using a 5/16” wrench for the bolts and 3/8” wrench for the nuts.
Lift away the Fan Coupler.
h.
Remove the burner, noting the alignment of the longitudinal seam of its
metal fibre surface relative to the ignitor location (it should be 180° of arc
opposed).
i.
Remove the burner: heat exchanger gasket, and protect for possible reuse.
j.
Remove the 4 bolts that attach the heat exchanger lid to the heat
exchanger. A 17 mm open end wrench or socket will be required. Note
alignment for reinstallation. Lift off lid.
k.
Note alignment of the inner refractory disk, then carefully lift out and
place on a clean, dry disposable material (paper or plastic).
Using this technique leaves the fan, gas valve and associated electrical
connections exposed to water and/or debris from heat exchanger
cleaning; take precaution by bagging these components.
2.
The preferred option for experienced IBC service personnel – for combined
servicing of the HX and swirl plate – involves removal of the FC and fan
together, done as follows:
a.
Perform steps 1 (a) to (f) as listed in #1above. Disconnect the 2 power
connections to the fan within step 1(c).
b.
Split the fan from the swirl plate/ intake air housing:
i.
Remove the 3 Phillips screws which run vertically upwards from the
gas valve into the fan. The rear screw can be challenging - these bolts
can be identified by the spacers under the bolt heads. Best to use an
4.3
NOTE
The safety warning regarding
burner refractory on page
4-2 of this manual must be
observed.
Burner Arm Bolts
Fan Screws
Gas Valve Bracket Screws
Summary of Contents for VFC 15-150
Page 74: ...SERVICE RECORD DATE LICENSED CONTRACTOR DESCRIPTION OF WORK DONE...
Page 75: ...NOTES...
Page 76: ...NOTES...
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