Unit Arrangement And Access; General; Routine Maintenance - Carrier WeatherMaster 50HCQ04-12 Service And Maintenance Instructions

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
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in death, serious
personal injury and/or property damage.
Never use air or gases containing oxygen for leak testing or
for operating refrigerant compressors. Pressurized mixtures
of air or gases containing oxygen can lead to an explosion.
WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in death, serious
personal injury and/or property damage.
Never use non-certified refrigerants in this product. Non-
certified refrigerants could contain contaminates that could
lead to unsafe operating conditions. Use ONLY refrigerants
that conform to AHRI Standard 700.
WARNING
UNIT DAMAGE HAZARD
Failure to follow this caution may result in reduced unit
performance or unit shutdown.
High velocity water from a pressure washer, garden hose,
or compressed air should never be used to clean a coil. The
force of the water or air jet will bend the fin edges and in-
crease airside pressure drop.
NOTICE
OPERATIONAL TEST ALERT
Failure to follow this ALERT can result in an unnecessary
evacuation of the facility.
Pressing the controller's test/reset switch for longer than
seven seconds will put the duct detector into the alarm state
and activate all automatic alarm responses.
IMPORTANT: Lockout/Tagout is a term used when elec-
trical power switches are physically locked preventing
power to the unit. A placard is placed on the power switch
alerting service personnel that the power is disconnected.

UNIT ARRANGEMENT AND ACCESS

General

Fig. 1 and Fig. 2 show general unit arrangement and access
locations.
COMPRESSOR
(08-09 ONLY)
Fig. 1 — Typical Access Panel Location (Front)
FILTER ACCESS
PANEL
OUTDOOR-AIR OPENING
AND INDOOR COIL
Fig. 2 — Typical Access Panel Location (Rear)

Routine Maintenance

These items should be part of a routine maintenance program,
to be checked every month or two, until a specific schedule for
each can be identified for this installation:
QUARTERLY INSPECTION (AND 30 DAYS AFTER INI-
TIAL START)
• Replace return air filter
• Clean outdoor hood inlet filters
• Check belt tension
• Check belt condition
• Inspect pulley alignment
• Check fan shaft bearing locking collar tightness
• Check outdoor coil cleanliness
• Check condensate drain
3
CONTROL BOX
COMPRESSOR
ACCESS PANEL
(04 - 07 only)
ACCESS PANEL
BLOWER
ACCESS
PANEL