Whirlpool ATE0743RPP, Technical Manual

Page: 89 / 92

8-5
GENERAL TROUBLESHOOTING
If the PTAC/PTHP is not working satisfactorily,
follow these basic troubleshooting suggest-
ions.
Being familiar with the sequence of operation
on Standard Controlled Operating Units or the
operation of the Remote Thermostat Controlled
Units is important. The following questions and
answers may help to identify performance prob-
lems.
ENVIRONMENTAL EFFECTS—
COOLING MODE
• Is the PTAC/PTHP sized to the room size
area and the cooling load demand?
Room
width x length x 3.5 equals an approximation
of the number of BTU’s required for the area.
Other factors can affect the number of BTU’s
required for an area, such as, the number of
electrical devices, solar gains, etc. Consider
these factors when sizing the PTAC/PTHP
for your application.
• Is the outdoor temperature 60
°
F (15.6
°
C)
or below? The PTAC/PTHP is designed for
proper cooling operation at outdoor tem-
peratures above 60
°
F (15.6
°
C).
• Is the indoor temperature 80
°
F (26.7
°
C) or
above? Ambient indoor temperatures of 80
°
F
(26.7
°
C) or above will take a longer period of
run time to cool down the area. Long run
times may indicate that the PTAC/PTHP is
undersized.
• Is indoor humidity high? This condition will
cause the PTAC/PTHP to operate longer to
remove humidity before noticing any cooling
effect.
• Has the cooling load been increased by
additional devices such as computer
equipment or has the room area been
increased where the PTAC/PTHP is lo-
cated?
If conditions have changed, the
PTAC/PTHP may not be able to cool and
condition as effectively as previously planned.
ENVIRONMENTAL EFFECTS—
HEATING MODE
• Is the PTAC/PTHP properly sized to the
room area and heat load demand?
Multi-
plying the width x length x 3.5 provides an
approximation of the number of BTU’s re-
quired for the area. Other factors can affect
the number of BTU’s required for an area,
such as, the number of electrical devices,
solar gains, etc. Consider these factors when
sizing the PTAC/PTHP for your application.
• Is the outdoor temperature 70
°
F (21.1
°
C)
or above? The PTAC/PTHP is designed for
proper heating operation at outdoor tem-
peratures below 70
°
F (21.1
°
C).
• Is the indoor temperature 60
°
F (15.6
°
C) or
below? Ambient indoor temperatures of 60
°
F
(15.6
°
C) or below will take a longer period of
run time to heat the area. Long run times may
indicate that the PTAC/PTHP is undersized.
• Has the room area been increased where
the PTAC/PTHP is located?
If the area
where the PTAC/PTHP is located has been
increased, the PTAC/PTHP may not provide
adequate heat.
INSUFFICIENT MAINTENANCE
AND INSPECTION
Installation errors are the most common cause
of poor performance. Please follow the instal-
lation instructions carefully.