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920-087-02
(9-03)
K. BasicTroubleshooting Techniques
Being familiar with the sequence of operation on Standard Controlled Operating Units or the operation of the RemoteThermostat Controlled
Units is important, The following questions and answers may help to identify performance problems,
EnvironmentalEffects- CoolingMode
Is unit sized to room size area and heat load demand?
RoomWidth x Lengthx 3.5 (x-factor) equal a "guesstimate" ofthe
numberofBTU'srequired for the area. The numberofpeopleinthe
room, number of electrical devices, solar gains, etc. are all variable
items that can affect proper sizing of the unit. Friedrich recommends
that you consult with an applications engineer for proper sizing.
Is the outdoor temperature 60°F or below?
The unit is designed for outdoor temperatures above 60°E
Is the indoor temperature 80°F or above?
Ambient indoor temperatures of 80°F or above will take a longer
period of run time to cool down the area. Long run times may
indicate that the unit is undersized.
Is indoor humidity high?
This condition will cause the unit to operate longer to remove
humidity before noticing any cooling effect.
Has the heat load been increased by additional devices such
as computer equipment, or has the room area been increased
where the unit is located?
If conditions have changed, the unit may not be able to cool and
condition as effectively as previously planned.
Environmental Effects - Heating Mode
Is unit properly sized to room area and heat load demand?
Multiplying the Width x Length x 3.5 ("x-factor") provides a
"guesstimate" of the number of BTU's required for the area. The
number of people in the room, number of electrical devices, solar
gains,etc. are all variable itemsthat can affect propersizingof the
unit. Ffieddchrecommends that you consult with an applications
engineer for proper sizing.
Is the outdoor temperature 70oFor above?- The unit is designed
for outdoor temperatures below 70°E
Is the indoor temperature 60°F or below?
Ambient indoor
temperatures of 6O°F or below will take a longer period of run
time to heat the area. Long run times may indicate that the unit is
undersized.
Has the room area been increased where the unit is located?
If the area where the unit is located has been increased, the unit
may not provideadequateheat.
Insufficient Maintenance and Inspection
Installationerrorsare the most common cause of poor performance.
Pleasefollow installationinstructionscarefully.If otherproblems exist,
see Maintenance and Inspection Troubleshooting Guide below.
Maintenance and Inspection Troubleshooting Guide
CAUSE
RESULT
System is not serviced or inspected
Can result in premature component failures, poor performance and
regularly (semiannually or annually),
increased operating costs.
Air filters are not cleaned regularly and
May result in poor cooling, icing and water problems as well as
become blocked with particles,
component failures and increased operating costs.
Condenser coil not maintained properly
May result in poor cooling, component failures and increased costs.
(blocked with particles).
Evaporator coil not maintained properly
May result in poor cooling, icing and water problems, and increased
(blocked with particles),
operating costs.
Components that show signs of fatigue
May result in multiple service calls, poor performance and increased
- not replaced,
operating costs.
Condensate drains and drain lines not
May result in water and odor problems.
maintained.
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