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Marvair GAA A/C w/Gas Heat I&O Manual
06/2023 Rev.5
5.5 LP Gas Conversion
The following instructions are for the field conversion of a Marvair gas heat with air conditioning from
using Natural Gas to LP ( propane ) gas. This kit includes parts required to convert a burner assembly
beginning with model number HMG075-125 only. Refer to the name plate attached to the right side of
the burner assembly to verify the first three letters of the Model number. These instructions are specific
to this burner assembly only.
The kit contains the following items required to make the conversion:
Item Qty.
Description
1
1
Gas valve regulator conversion kit – Honeywell P / N 396021
2
5
Gas orifices – Drill size 1.5
mm for propane gas
3
1
Label to attach to the manifold indicating that the unit has been converted to use LP Gas.
WARNING
FIRE, CARBON MONOXIDE OR EXPLOSION HAZARD
Failure to properly install the LP gas conversion kit could result in death, serious injury or property damage.
The unit is shipped from the factory for operation on natural gas. When used on LP gas, the gas orifice spud
and the gas valve spring must be replaced and the gas valve regulator must be adjusted. This conversion kit
shall be installed by a qualified service agency in accordance with the manufacturer’s instructions and all
applicable codes and requirements of the authority having jurisdiction. If the information in these instructions is
not followed exactly, a fire, explosion or production of carbon monoxide may result causing property damage,
personal injury or loss of life. The qualified service agency performing this work assumes the responsibility
for the proper conversion of the appliance with this kit.
AVERTISSEMENT
DANGER D’INCENDIE, MONOXYDE DE CARBONE OU EXPLOSION
Ne pas installer correctement le kit de conversion au gaz propane ( LP ) peut entraîner des blessures graves
ou mortelles ou des dégâts matériels.
L’unité est livrée de l’usine pour fonctionner au gaz naturel. Quand elle est utilisée avec du gaz propane, il faut
remplacer tête d’injecteur et ressort de vanne, et le réglage du régulateur de vanne de gaz doit être modifié. Ce
kit de conversion ne doit être installé que par une agence de dépannage qualifiée en suivant les instructions du
constructeur et toutes les normes et exigences applicables édictées par les autorités ayant juridiction dans
ce domaine. Si les informations contenues dans ces instructions ne sont pas suivies exactement, il peut en
résulter un empoisonnement au monoxyde de carbone ou une explosion, causant dommages, blessure ou
mort. C’est l’agence de dépannage qualifiée qui effectue le travail qui assume la responsabilité de la conversion
correcte de l’appareil avec ce kit.
LP Gas Conversion Installation Procedures
1. First, shut off all gas supply to the unit using the manual shut off valve. The gas must be shut
off BEFORE disconnecting the electrical power or proceeding with any other step in the LP gas
conversion.
2. Disconnect or shut off all electrical power to the unit and then turn the thermostat to the OFF position.
3. Disconnect wire to the gas valve. If wire colors are not evident or do not match the wiring diagram,
label each wire.
4. Loosen the gas pipe union and remove the gas supply pipe from the gas valve.
