Manual

920-087-02(9-03)
K. BasicTroubleshootingTechniques
Beingfamiliarwith 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?
RoomWidthx Lengthx 3.5 (x-factor)equal a "guesstimate" ofthe
numberofBTU'srequiredfor thearea. The numberofpeopleinthe
room, numberof electrical devices, solar gains, etc. are allvariable
items thatcan affect propersizingof the unit. Friedrichrecommends
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 above60°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 isundersized.
Is indoor humidity high?
This condition will cause the unit to operate longer to remove
humidity before noticing anycooling effect.
Hasthe heat loadbeen increased by additional devices such
as computer equipment, or hasthe 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 inthe 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 outdoortemperature 70oForabove?- 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.
Hasthe roomarea been increased where the unit is located?
If thearea where the unit is located has been increased, the unit
may not provideadequateheat.
Insufficient Maintenance and Inspection
Installationerrorsare the most common cause of poorperformance.
Pleasefollow installationinstructionscarefully.Ifotherproblemsexist,
see Maintenance and InspectionTroubleshooting Guide below.
Maintenance and Inspection Troubleshooting Guide
CAUSE RESULT
System isnot serviced or inspected Can result inpremature component failures, poor performance and
regularly (semiannually or annually), increased operating costs.
Air filters are not cleaned regularly and May result in poor cooling, icingand water problems as well as
become blockedwith 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, icingand water problems, and increased
(blocked with particles), operating costs.
Components that show signs offatigue 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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