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Marvair GAA A/C w/Gas Heat I&O Manual
06/2023 Rev.5
Chapter 5 Checks and Adjustments
The unit must be operating in the heating mode while doing the following check and adjustments. Refer
to the Start up instructions for starting the unit.
WARNING
ELECTRICAL SHOCK, FIRE, EXPLOSION OR
CARBON MONOXIDE POISONING HAZARD
Failure to follow safety warnings exactly could result in serious injury, death and / or property damage.
If any sparks, odors or unusual noises occur, IMMEDIATELY shut OFF gas and power to the unit. Check for
wiring errors, gas leaks or obstructions to the blower.
AVERTISSEMENT
DANGER D’ÉLECTROCUTION, INCENDIE, EXPLOSION
OU EMPOISONNEMENT AU MONOXYDE DE CARBONE
Ne pas respecter exactement les AVERTISSEMENTSde sécurité peut causer des dommages corporels graves
ou mortels et / ou des dégâts matériels.
En cas de constatation d’étincelles, odeurs ou bruits anormaux, COUPEZ IMMÉDIATEMENT le gaz et
l’alimentation secteur de l’unité. Vérifiez s’il y a des erreurs de câblage, des fuites de gaz ou des obstructions
au soufflage.
5.1 Gas Supply Pressure
Gas supply pressure should be within the minimum and maximum values listed on the data plate on the air
conditioner with gas heat furnace. Pressures are typically set by the gas supplier.
5.2 Manifold Gas Pressure Adjustment
WARNING
FIRE, EXPLOSION OR CARBON MONOXIDE POISONING HAZARD
Failure to turn the gas OFF at the shut off valve before connecting manometer could result in death and / or
personal injury.
Turn the gas valve to OFF before connecting the manometer.
AVERTISSEMENT
DANGER D’INCENDIE, EXPLOSION
OU EMPOISONNEMENT AU MONOXYDE DE CARBONE
Ne pas couper l’arrivée de gaz au robinet de coupure avant de brancher le manomètre peut causer des
blessures graves ou mortelles.
Fermez le robinet de gaz ( position OFF ) avant de brancher le manomètre.
1. With gas valve OFF, connect the manometer to manifold pressure tap on outlet ( 1 / 8” NPT ) of the gas
control valve. Use a manometer with a 0” to 12” water column range.
