Conversion From Natural Gas To Propane - Slant/Fin VGH-299-CH Installation And Service Manual

Conversion from natural gas to propane

Conversion of the boiler to a different gas type must be performed by a certified technician.
Wrong setting can lead to damage to the appliance or shorten the lifespan of the appliance!
WARNING
Use only parts/conversion kits obtained from Slant Fin and
intended to be used with this particular boiler. Every
conversion kit is provided with instructions how to
assemble the kit to the boiler.
Converting the boiler to propane (LP) requires the following actions (details below).
1. check boiler model
2. check burner controller type
3. mount the orifice
4. set parameter 138
5. adjust the CO / O
2
6. confirmation: apply the propane sticker and mark the boxes
1. Check boiler model. Check if you have a 299, 399 or 500 boiler. The model number is on the dataplate, on
the inside of the boiler casing, top side.
2. Check burner controller type.
Check which controller type is installed, see picture.
- if a model number is on the sticker on the controller,
the boiler is equiped with an internal igniter.
- if a sticker "EXTERNAL IGNITER 299/399/500 MBH"
is present on the controller, the boiler is equiped
with an external igniter.
3. Mount the orifice:
Boiler type Orifice Inner Diameter
VGH 299 CH
VGH 399 CH
VGH 500 CH
Table 18. 2
Installing the orifice (see also picture):
Required tools: wrench 55, hex key 5 mm and hex key 4 mm.
1. Close the external gas shutoff valve and disconnect the
electrical power before opening the boiler.
2. Use a wrench to open the coupling in the gas line in the boiler.
The three screws, with which the venturi is mounted onto the
fan, can now be removed.
3. Venturi and gas combination valve can now be separated. The
orifice is to be placed between venturi and gas combination
valve. The rounded side of the orifice must be on the side of
the gas combination valve.
The orifice must be mounted into the gas entrance of the
venturi and secured with the rubber gasket.
4. Venturi and gas combination valve can now be reconnected.
5. Remount the gas combination valve and the venturi onto the
fan. Close the union in the internal gas line.
6. Now open the external gas valve.
7. Check for gas leaks.
8. Reconnect the electrical power.
9. If in operation, check again for gas leaks on all parts that have
been apart.
104
Parameter 138 must be set correctly!
The warranty of the device will expire if a wrong selection has been made.
percentage
2
Converting the boiler to propane is done by placing a propane
orifice between gas valve and venturi. By using the correct orifice
6.2
size (see table), the measured CO
6.7
gas will already be close to the desired value.
7.2
E93.1601EN032.C VGH installation manual
Required parts: (see § 5.1 Accessories)
Propane kit for VMS Venturi hole Ø 6.2 VGH 299
Propane kit for VMS Venturi hole Ø 6.7 VGH 399
Propane kit for VMS Venturi hole Ø 7.2 VGH 500
299MBH VERSION
399MBH VERSION
500MBH VERSION
EXTERNAL IGNITER
299/399/500 MBH
2
Sticker
Picture 18. 5
Picture 18. 4
(O ) percentage in the flue
2
Orifice
Gasket