REMEHA P 420 User manual

P 420
Fuel oil/gas boilers
Remeha
Assembly
Instructions
300016854-001-A
EN
63193

2P 420 02/04/08 - 300016854-001-A
1 Package list
Package list : Before starting to assemble the boiler, refer to the table below to check if you have received all the packages required.
1. Boiler body +Accessories
Boilers supplied with an assembled body
For boiler supplied with the boiler body in bulk
2. Baffle plates
3. Casing
4. Cable channel
5. Control panel RC 1
6. Technical documents
Number of sections 8 9 10 11 12 13 14
Assembled boiler body - (contents depend upon model) 1111111
Number of sections 8 9 10 11 12 13 14
Frontsection 1111111
Specialintermediatesection 1111111
Normalintermediatesection 567891011
Rearsection 1111111
Commonaccessories 1PackageCS20CS20CS20CS20CS20CS20CS20
Lowerinsulation,boilerbody 1PackageCS51CS53CS53CS55CS55CS57CS57
Base frame - dimensions depend upon
model 1111111
Number of sections 8 9 10 11 12 13 14
Baffle plates 1 Package CS 30 CS 31 CS 31 CS 32 CS 32 CS 33 CS 33
Number of sections 8 9 10 11 12 13 14
Casing(commonparts) PackageRB21111111
Casing, variable parts Package MP2 - - 1 - - 1 -
Package MP3 1 - - 1 - - 1
PackageMP4-111222
Package MP5 - 1 - - 1 - -
Number of sections 8 9 10 11 12 13 14
Cable channel 1 Package CS 41 CS 42 CS 43 CS 44 CS 45 CS 46 CS 47
Number of sections 8 9 10 11 12 13 14
Technical documents
(Content depends upon country) 1Package1111111

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02/04/08 - 300016854-001-A P 420
2 Boilers supplied with an assembled body
Manoeuvring the assembled boiler body
To manoeuvre the assembled body, it is possible to use the four
lifting rings located on the frame.
Hydraulic test:
Refer to view 10
Certain parts will have to be removed to carry out the hydraulic test.
Mounting:
For boilers with assembled boiler body, start assembly from figure 16
3 Mounting
Warning : Assemble the boiler in the order given by the
numbers of each figure, in compliance with all the
instructions.
Refer to the applicable price list for any optional features used.
Tools required
- 1 22 box spanner
- 1 Phillips screwdriver
- 1 hammer
- 1 putty gun
- 1 stanley knife
- 13 - 19 - 24 spanners
- 1 Allen key
- JDTE or JDTE Plus assembly tool

4P 420 02/04/08 - 300016854-001-A
Boilers supplied with an assembled body
•Hydraulic test:
Refer to view 10
Certain parts will have to be removed to carry out the hydraulic test.
•Mounting:
For boilers with assembled boiler body, start assembly from figure 16
For boiler supplied with the boiler body in bulk
Hydraulic test: Refer to view 10
Mounting: Assembly of the sections is done from back to front
as shown below, beginning with assembly view 1
Front - Rear
Boiler type Rear section Special intermediate
section
Normal intermediate
section Front section
P 420-8 1151
P 420-9 1161
P 420-10 1171
P 420-11 1181
P 420-12 1191
P 420-13 11101
P 420-14 11111

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02/04/08 - 300016854-001-A P 420
1 Assembly of the base frame, delivered unassembled
M001233
1
M001234
2
2
3
3

6P 420 02/04/08 - 300016854-001-A
2 Fitting the brackets
Front - Rear
P 420-8 - P 420-10 - P 420-12 - P 420-14
P 420-9 - P 420-11 - P 420-13
`Fit the 2 rear holding brackets and secure them to the frame.
Use the corresponding holes following the indication on the frame.
`Position the lower insulation (fabric to the top) package CS 51 to CS 57. If necessary, adapt the length of or fold the lower insulation after
completing assembly of the casing.
3 Positioning the frame and the rear section
Establish the location of the frame on the basis of the opening direction of the furnace door and the length of the burner.
Position the rear section on the frame and prop it up.
Affix it to the brackets (2 screws HM 12x40/40 + 4 washers L12 + 2 nuts HM12).
Around every 100 mm, place points of silicon mastic (1 tube delivered with the accessories package CS 20) in the leak proofing groove in
the section using a gun.
Carefully introduce the leak proof thermocord into the leak proofing groove.
do not pull on the seal while inserting it. Otherwise, you may stretch it and reduce its thickness. You must not make the junction
point with the thermocord in the lower part of the section.

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02/04/08 - 300016854-001-A P 420
4
Handle the nipples with gloves, there might be sharp
edges.
- Clean the bores and nipples. Coat with the lubricant supplied with
the sections.
(1) Sandpaper
(2) Lubricant (Supplied)
5
- Gently push in the 2 nipples.

8P 420 02/04/08 - 300016854-001-A
6 Assembling the sections
A : Thermocord
Special intermediate section in front of rear section.
Place the first special intermediate section, making sure that it is turned in the right direction, i.e. with the flattening groove against the
thermocord.
For safety reasons, insert an upper assembly rod (loose boiler body accessories package) into the holes in the 2 sections.
Push the section gently and simultaneously on the 2 nipples of the rear section with a hammer and a piece of wood positioned in line with
the bores.

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7
- Put the assembly tool in position.
- Tighten gradually so as to bring together the upper and lower connections evenly and simultaneously.
8
- Fit the remaining sections one by one in the order shown, proceeding as per the views 3-4-5-6.
-Leave the assembly tool in place.

10 P 420 02/04/08 - 300016854-001-A
9 Fitting the upper and lower assembly rods and the upper casing
supports
(1) Front - (2) Rear
- Fit the upper assembly rods (boiler body accessories) in the order
shown in the diagram above. Place the expansion spring and its
washer on each rod at the rear. Stop tightening the nuts when
the free space between the threads is around 2 mm.
- Fit the upper casing supports (package CS13) and the upper
cross-bars (package CS10-11-12-14) with the assembly rods
(boiler body accessories package) as per the details A-B-C-D.
- Fit the lower assembly rods in the order shown in the diagram.
- Remove the assembly tool.

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02/04/08 - 300016854-001-A P 420
10 Hydraulic test
After assembling the boiler body, the installer must carry out a water tightness test at a pressure equal to 1.3 times the operating
pressure (that is 7.8 bar mini) for 10 minutes at least.
Ensure that all the air in the boiler is vented to avoid any
bursting of the body.
After the tightness test, drain the boiler and remove all the parts used
for the test.

12 P 420 02/04/08 - 300016854-001-A
11
- Secure the flue gas nozzle (boiler body accessories) to the flue gas
box (package CS 20) using 4 screws HM 12 x40 + 4 nuts H 12 + 4
washers.

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02/04/08 - 300016854-001-A P 420
12
Fit the 2 threaded rods using multiple slip joint pliers (body
accessories package) M12x175 for the flue gas outlet.
Secure the outlet and return pipes (boiler body accessories
package) using 4 nuts H16 for each pipe (24 mm spanner),
remembering to insert the leak proof seal.
A: P420-8 to P420-10.
B: For P420-11 to P420-14, the return collector is replaced by
a collector with water distributor (marked "INJ")
Fit the flue gas outlet to the heating body (6 nuts H12 + 6 flat
washers L12 - 19 mm spanner).
Fit 2 screws HM 12x60 + 2 nuts to the flue gas outlet for the
sweeping hatch (see detail).
Affix the sweeping hatches (package CS 20) using 4 nuts H12 +
2 washers L12 + 2 washers M12.
Assembling the flow switch:
Fasten the flow switch on the sleeve tube. The direction of the arrow
head on the collet must be the same as the flowing out of the water
in the tube.
The table opposite is used to check that the flow controller delivered
corresponds to the boiler being assembled.
Boiler Flow controller no.
P 420-8 8802-4706
P 420-9 8802-4710
P 420-10 8802-4712
P 420-11 8802-4722
P 420-12 8802-4725
P 420-13 8802-4727
P 420-14 8802-4729

14 P 420 02/04/08 - 300016854-001-A
13
Put in place the lower plug and the upper plug with the sensor
tube (boiler body accessories package).
Do not forget the hemp.
Put the 8 M12x50 pins in place in the holes provided for this
purpose.
Put the 2 M12x85 pins in place in the holes provided for this
purpose.
Fit the hinges to the sweeping doors (package CS20) using 2
screws HM 12 x 25 + 2 nuts M 12 + 4 washers DE 12
-Fit the hinge on the door of the combustion chamber (boiler
body accessories package) to the left or right depending on which
way you wish to open it and secure using 3 screws HM12x30 +
washers CL14.
14
Boiler body accessories package
Assemble the door of the combustion chamber (4 nuts M12 + 4
thick washers)
Put in place the added hinge with its hinge pin.

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15
Affix the added hinge (boiler body accessories package) to the
door of the combustion chamber using the 3 screws HM12x30 + 3
washers L 12 (previously dismantled).
Leave the 3 screws HM12x30 and the 3 washers L12 in
place on the combustion chamber door on the side
opposite to the added hinge.
-Put in place the left and right sweeping doors with their hinge
pin (package CS 20).

16 P 420 02/04/08 - 300016854-001-A
16 Assembling the baffle plates
Boilers for following countries: NL - BE - ES
Boilers for following countries: GB - HU - SE
The 8-figure part number of the baffle plate is moulded into the
metal.
- Put the upper, central and lower baffle plates in place, following the
order of assembly shown in the diagram.
Follow the order of assembly shown in the diagram.
Hook the baffle plates into one another before fitting them
into the flue ways.
- Close the sweeping doors and secure using 3 nuts HM12 + 3 thick
washers L12x32x5.
Flue ways P 420-8 P 420-9 - P 420-10 P 420-11 - P 420-12 P 420-13 - P 420-14
Upper 8229-0010 and 8229-0022 2 x 8229-0010 2 x 8229-0010 and
1 x 8229-0022 3 x 8229-0010
Central 8229-0011 and 8229-0023 2 x 8229-0011 2 x 8229-0011 and
1 x 8229-0023 3 x 8229-0011
Lower 8229-0012 and 8229-0024 2 x 8229-0012 2 x 8229-0012 and
1 x 8229-0024 3 x 8229-0012
Flue ways P 420-8 P 420-9 - P 420-10 P 420-11 P 420-12 P 420-13 - P 420-14
Upper 8229-0010 and 8229-
0022 2 x 8229-0010 2 x 8229-0010 and 1 x 8229-0022
2 x 8229-0010 and
1 x 8229-0022 3 x 8229-0010
Central 8229-0011 and 8229-
0023 2 x 8229-0011 2 x 8229-0011 and
1 x 8229-0023
2 x 8229-0011 and
1 x 8229-0023 3 x 8229-0011
Lower 8229-0012 and 8229-
0024 2 x 8229-0012 2 x 8229-0012 and 1 x 8229-0024 2 x 8229-0012 2 x 8229-0012

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02/04/08 - 300016854-001-A P 420
17 Boilers supplied with an assembled body
. (1) Rear
- Unscrew the screw Aon the bracket.
ZTo fit the flow controller, refer to stage no. 11.
18
Affix the lower casing supports (packages RB2, MP2 and MP5)
to the frame using 1 screws HM8x25 + serrated washer for each
support.
Insert the boiler body insulation panels. Hold the insulation in
place by knotting each strap to the lower casing support on either
side of the boiler
Boiler
Insulation width, boiler body
500 500 600 800 900
Front Rear
P 420-8 1 - - - 1
P 420-9 1 1 1 - -
P 420-10 1 1 - 1 -
P 420-11 1 1 - - 1
P 420-12 1 2 1 - -
P 420-13 1 2 - 1 -
P 420-14 1 2 - - 1
package RB2 MP4 MP5 MP2 MP3

18 P 420 02/04/08 - 300016854-001-A
19
`Insert the rear insulation - Package R B2.
20
Boilers supplied with an assembled body: Fit the upper crosspieces (See step 9), then:
Put the left and right cable ways in place, respecting the assembly sequence.
Secure the cable ways (3 screws HM5x25 + serrated washers).
Secure the front top panel (package RB2) with 4 screws HM5x25 + serrated washers.

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02/04/08 - 300016854-001-A P 420
21 Control panel assembly
(1) Front - (2) Rear
Position the control panel in the rear bushes.

Open the control panel by unscrewing the 2 screws on the front
of the panel.
22
* except NL (see instructions delivered with the water low safety
pressure-sensitive switch)
- Carefully unroll and take out the various bulbs from the control
panel, passing them through the opening in the front cover.
- Then, insert the bulbs inside the pocket and maintain them with the
spring.
- At the front, screw the control panel to the cover using 2 self-
tapping screws Ø 3.9x12.7 + serrated washers (Phillips
screwdriver).
23 Electrical connection
All connections are made with the terminal boxes designed for that
purpose on the back of the boiler's command board.
Connections must be made by a qualified technician.
*
*

20 P 420 02/04/08 - 300016854-001-A
24 Casing assembly
Position the front side panels (length 520 - Package RB2) in the
lower casing supports and hook them into the cable ways.
Position the front side panels with the bushes pointing to
the front of the boiler.
Fix to the front on the lower casing brackets using 2 screws
HM5x25 + serrated washers.
Fit to the front (2 screws Ø 3.94x12.7 + serrated washers).
Position the burner cable as shown in the diagram and on the
opposite side to the hinges on the door of the combustion chamber.
-
25
`Position the remaining side panels in the order shown in the
diagram: position each panel in the lower casing supports and
hook it into the cable way.
Position the rear side panels with the bushes pointing to
the rear of the boiler.
Boiler Insulation width, boiler body
Front Rear
P 420-8 520(RB2) 930(MP3)
P 420-9 520(RB2) 480(MP4) 610(MP5)
P 420-10 520(RB2) 480(MP4) 770(MP2)
P 420-11 520(RB2) 480(MP4) 930(MP3)
P 420-12 520(RB2) 480(MP4) 480(MP4) 610(MP5)
P 420-13 520(RB2) 480(MP4) 480(MP4) 770(MP2)
P 420-14 520(RB2) 480(MP4) 480(MP4) 930(MP3)