Installation guide

TROUBLESHOOTING
If the PTAC/PTHP is not working satisfactorily, follow these basic
troubleshooting suggestions.
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
problems.
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 temperatures 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 located? 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? Multiplying the width x length x 3.5
provides 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 70°F (21.1°C) or above? The
PTAC/PTHP is designed for proper cooling operation at
outdoor temperatures 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 installation instructions carefully.
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