Carrier WeatherMaster 48HC04 Series Installation Instructions Manual page 2

which will result in enhanced installation, reliability, or
operation.
WARNING
Electrical shock can cause personal injury and death. Shut off
all power to this equipment during installation. There may be
more than one disconnect switch. Tag all disconnect locations
to alert others not to restore power until work is completed.
WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in serious personal
injury, death, and/or property damage.
Disconnect gas piping from unit when leak testing at pressure
greater than 0.5 psig (3450 Pa). Pressures greater than 0.5 psig
(3450 Pa) will cause gas valve damage resulting in hazardous
condition. If gas valve is subjected to pressure greater than
0.5 psig (3450 Pa), it must be replaced before use. When
pressure testing field-supplied gas piping at pressures of
0.5 psig (3450 Pa) or less, a unit connected to such piping must
be isolated by closing the manual gas valve(s).
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
Puron ® (R-410A) refrigerant systems operate at higher pres-
sures than standard R-22 systems. Do not use R-22 service
equipment or components on Puron refrigerant equipment.
WARNING
PERSONAL INJURY AND ENVIRONMENTAL HAZARD
Failure to follow this warning could cause personal injury
or death.
Relieve pressure and recover all refrigerant before system
repair or final unit disposal.
Wear safety glasses and gloves when handling refrigerants.
Keep torches and other ignition sources away from refriger-
ants and oils.
WARNING
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing, safety glasses and
gloves when handling parts and servicing air conditioning
equipment.
WARNING
CARBON-MONOXIDE POISONING HAZARD
Failure to follow instructions could result in severe personal
injury or death due to carbon-monoxide poisoning, if com-
bustion products infiltrate into the building.
Check that all openings in the outside wall around the vent
(and air intake) pipe(s) are sealed to prevent infiltration of
combustion products into the building.
Check that furnace vent (and air intake) terminal(s) are not
obstructed in any way during all seasons.
AVERTISSEMENT
RISQUE D'INTOXICATION AU MONOXYDE DE
CARBONE
Si ces directives ne sont pas suivies, cela peut entraîner des
blessures graves ou une intoxication au monoxyde de
carbone pouvant causer la mort, si des produits de
combustion s'infiltrent dans le bâtiment.
Vérifier que toutes les ouvertures pratiquées dans le mur
extérieur autour du ou des tuyaux d'évent (et de la prise
d'air) sont scellées de manière à empêcher l'infiltration de
produits de combustion dans le bâtiment.
Veiller à ce que la ou les sorties de l'évent de l'appareil de
chauffage (et la prise d'air) ne soient, en aucune façon,
obstruées, quelle que soit la saison.
FIRE HAZARD
Failure to follow this warning could result in personal inju-
ry, death, and/or property damage.
Inlet pressure tap set screw must be tightened and
NPT pipe plug must be installed to prevent gas leaks.
GAS VALVE
INLET PRESSURE
TAP SET SCREW
FIRE HAZARD
Failure to follow this warning could result in personal inju-
ry, death, and/or property damage.
Manifold pressure tap set screw must be tightened and
NPT pipe plug must be installed to prevent gas leaks.
MANIFOLD PRESSURE
TAP SET SCREW
2
WARNING
WARNING
MANIFOLD
GAS VALVE
1 / -in.
8
1 / -in.
8