Automatic By-Pass; Expansion Vessel; Condense Trap Removal; Flue Collector Removal - Benchmark Procombi A Series Installation & Servicing Instructions Manual

Fig. 27: To remove the fan burner assembly (A)
locate and remove the 3 external nuts (B). Replace
in the reverse order. Ensure all seals are in good
condition, taking care to ensure they are replaced
correctly.
6.17 AUTOMATIC BY-PASS & DHW NON-RETURN
VALVE (fig. 28)
Carry out component removal procedure as de-
scribed in 6.4.
Remove the locking pin (A) that secures the cover
(B) to the hydraulic manifold. Using a hooked piece
of wire, carefully withdraw the by-pass cartridge (C)
and/or DHW non-return cartridge (D). Ensure all seals
are in good condition, taking care to ensure they are
replaced correctly. Replace in the reverse order ensur-
ing the cartridge is facing the correct way.
A
D
Fig. 28
6.18 EXPANSION VESSEL (fig. 1)
Should the removal and replacement of the ex-
pansion vessel be deemed impractical, an exter-
nal expansion vessel may be fitted to the return
pipe as close to the appliance as possible.
6.18.1 EXPANSION VESSEL REMOVAL (with suffi-
cient clearance above, fig. 29)
Carry out component removal procedure as de-
scribed in 6.4. Disconnect the flue from the appli-
ance. Disconnect the expansion vessel from the
flexible expansion pipe. Disconnect the flexible
expansion pipe from the vessel. Unscrew the nut
that secures the vessel to the lower frame. Lo-
cate and remove the 6 screws (A) that secure the
vessel top holding plate (B), remove the plate.
The expansion vessel can now be removed. Re-
place in the reverse order. Ensure all seals are in
good condition, taking care to ensure they are
replaced correctly.
B
fig. 29
C
B
A
A
B
C
A
fig. 30
6.19 CONDENSE TRAP REMOVAL (fig. 30)
Carry out component removal procedure as de-
scribed in 6.4. Disconnect the 2 upper rubbers
condense pipe (A). Remove the pin (B) that se-
cures the trap to the air box plate. Disconnect the
lower rubber condense pipe (C) from the condense
trap. Carefully remove the condense trap. Replace
in the reverse order.
6.20 FLUE COLLECTOR REMOVAL (fig. 31)
Carry out component removal procedure as de-
scribed in 6.4. Unclip and remove the air chamber
front and left side covers. Locate and remove the
screw (A) that secures the flue gas analysis test
point cover (B). Remove the clip and the fumes
thermostat. Gently pull down and to the left and
ease the flue collector from its location. Replace
in the reverse order.
fig. 31
B
C
B
A
17