Proheat M Series User manual

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M-SERIES DIAPHRAGM

REPLACEMENT KIT

Part# 200685K

Disassembly Instructions 1. Disconnect all harnesses at the PCM.

2. Disconnect the fuel supply line.

3. Referring to figure A, loosen and back out the burner head

mounting bolts (item 1) allowing enough room to rotate the

burner head 15° counter-clockwise and remove.

4. Turn the Burner head over as shown in figure B. Remove the

ignition electrode (item 16) then the flame shield (item 17).

5. Remove the valve cover (item 7) by removing the four M5 screws

(item 5) and lock washers (item 6), then remove the cylinder head

(item 10).

6. Remove and discard the two O-rings (items 8 and 9) from the

valve cover (item 10), and the two O-rings (item 15) from the

burner head flange (item 4).

7. Remove the #8 screw (item 11) from the connecting rod assembly

(item 21), then remove the intake disk (item 12), diaphragm (item

13) and compression disk (item 14).

To avoid the risk of shock, ensure to

disconnect power to the heater unit

during disassembly/reassembly.

WARNING

Figure B.

Copy Part# 206500, Rev. C Page 1 of 4

Date: 05/2017

INSTALLATION INSTRUCTIONS

Figure A.

DO NOT discard any component unless

directed to do so. All mounting hardware

will be re-used during the installation

of the compressor kit.

NOTICE

NOTE ORIENTATION

TORQUE:

25 ± 3 IN-LBS

NOTE

ORIENTATION

NOTE

ORIENTATION

DIAPHRAGM

OPENING

Disassembly Parts Checklist ITEM RE-USE DISCARD DESCRIPTION QTY UOM

1 X Screw, M8 x 1.25 x 30, HWHCS 2 ea

2 X Screw, M6 x 1 x 1.25, BHSCS SS 2 ea

3 X Blower Housing 1 ea

4 X Burner Head Flange 1 ea

5 X Screw, M5 x 0.8 x 30 SHCS ZP 4 ea

6 X Lockwasher, #10 SS 8 ea

7 X Valve Cover 1 ea

8 X O-Ring, 2-035 1 ea

9 X O-Ring, 2-031 1 ea

10 X Cylinder Head 1 ea

11 X Screw, #8-32 x 1/2, FHSCS SS 1 ea

12 X Intake Disk 1 ea

13 X Diaphragm 1 ea

14 X Compression Disk 1 ea

15 X O-Ring, 2-010 2 ea

16 X Ignition Electrodes 1 ea

17 X Flame Shield 1 ea

18 X Screw, M5 x 0.8 x 10, SHCS SS 4 ea

19 X Compressor Cover 1 ea

20 X Compressor Shaft Assembly 1 ea

8. Remove the compressor cover (item 19) by removing the four

M5 screws (item 18) and lock washers (item 6).

9. Discard all of the remaining components as per the disassembly

parts checklist.

Figure C.

Install the diaphragm assembly (items 22–25) onto the connecting

rod. NOTE: orient the intake disk (item 23) and compression

disk (item 25) with the beveled side pointing away from burner

head flange (see figure C inset).

2. Install two O-rings (item 26) into the burner head flange (item 4).

Reassembly Instructions

Copy Part# 206500, Rev. C Page 2 of 4

Date: 05/2017

INSTALLATION INSTRUCTIONS

ENSURE CONNECTING ROD IS CENTERED

IN DIAPHRAGM OPENING

TORQUE:

27 ± 3 IN-LBS

TORQUE:

27 ± 3 IN-LBS

TORQUE SEQUENCE

3. Install two O-rings (items 27 & 28) into the valve cover (item 7).

4. Position the connecting rod assembly (item 21) so that it is in

BDC (see figure D), and ensure the diaphragm (item 24) is

concentric to the “diaphragm opening”.

NOTE: this operation is CRITICAL prior to proceeding onto step 5.

5. Install the cylinder head assembly (item 10) and valve cover

(item 7) and secure with four M5 screws (item 5) and lock

washers (item 6). Torque the screws according to the torque

sequence shown in figure E inset.

6. install the compressor cover (item 19) and secure with four screws

(item 18) and lock washers (item 6).

Figure D.

TDC

ENSURE COUNTER-WEIGHT IS ALIGNED BOTTOM

DEAD CENTER (BDC) BEFORE INSTALLATION

BDC

Figure E.

MODEL AIR PRESSURE SETTING

M50 6.0 ± 0.1 PSI (41.4 ± 0.7 kPa)

M80 2.9 ± 0.1 PSI (20.0 ± 0.7 kPa)

7. Install the heat shield (item 17) and ignition electrodes (item 16).

8. Set Compressor Pressure (refer to figure F).

Refer to M-Series Service Manual SL9150 at www.proheat.com

for detailed instructions. Air filter and nozzle must be clean for

compressor setting. Inspect air passages of fuel block and

clean as required.

Copy Part# 206500, Rev. C Page 3 of 4

Date: 05/2017

INSTALLATION INSTRUCTIONS

9. Install the heat shield (item 17) and ignition electrodes (item 16).

10. Inspect and Clean Heat Exchanger and Combustion Tube.

Remove combustion tube to access the inside of the heat exchanger.

Clean any combustion deposits that may have accumulated on

the heat exchanger fins with a wire brush. Use a vacuum to suck

the combustion deposits out. Ensure that the exhaust pipe is

clean and free from restriction.

Clean the combustion tube with a wire brush. Reinstall combustion

tube into the heat exchanger ensuring that the orientation boss

is at the 12 o’clock position as shown in figure G.

11. Install the burner head back onto the heat exchanger and secure

with two screws (item 1) as shown in figure H.

12. Operate heater for a minimum of two cycles to ensure functionality.

Inspect for fuel leaks around the exterior of the burner head and

heat exchanger.

ORIENTATION

BOSS

HEAT EXCHANGER

FLANGE NOTCH

COMBUSTION TUBE

Figure G.

PRESSURE

ADJUSTMENT

SCREW

DECREASE

PRESSURE

GAUGE (P/N PK0067)

INCREASE

PRESSURE

Figure F.

ITEM DESCRIPTION QTY UOM

22 Screw, #8-32 x 1/2, FHS CS SS 1 ea

23 Intake Disk 1 ea

24 Diaphragm 1 ea

25 Compression Disk 1 ea

26 O-Ring, 2-010 2 ea

27 O-Ring, 2-035 1 ea

28 O-Ring, 2-031 1 ea

29 Cylinder Head 1 ea

Reassembly Parts Checklist

Figure H.

PK0067 Pressure Test Gauge is required

to complete the rebuild. It is NOT

supplied in the rebuild kit.

Go to www.proheat.com for more

information.

NOTICE

Copy Part# 206500, Rev. C Page 4 of 4

Date: 05/2017

INSTALLATION INSTRUCTIONS

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