Gentherm 5220 - Power Output Evaluation; Ambient Temp Effects on Vset;Power; Determining Vset and Power

28142 Rev 15 POWER OUTPUT EVALUATION
Gentherm Global Power Technologies Page 35
7 POWER OUTPUT EVALUATION
Output power is the primary indication of correct setup, adjustment, and operation of the
TEG. This section describes how to determine if the TEG is providing rated power. Power
output should be evaluated:
• during initial setup at site;
• when adjusting a TEG;
• before and after servicing a TEG, and
• whenever fuel composition or type has changed.
NOTE:
Typical fuel pressure settings for the model 5220 are 130-144 kPa (18.5 – 21
PSI) for natural gas and 125-140 kPa (18.0 - 20.0 PSI) for propane. Consult
the TEG data plate for the starting fuel pressure on your unit.
NOTE:
Good record keeping is necessary for long term follow-
up. Use the TEG
Performance Log - located at the end of this manual -
for recording details
each time adjustments are made, or servicing is carried out.
Power from the 5220 TEG is produced by the difference in temperature between the burner
and the cooling fins. This means the power output of the TEG is affected by the ambient
temperature surrounding the generator. Power output increases when temperature falls and
decreases when temperature climbs.
Power drops by 0.8W for every 1°C increase in ambient temperature. Similarly, power
increases by 0.8W for every 1°C decrease in ambient temperature. This effect needs to be
considering when setting-up the TEG. Use Figure 20 to graphically determine the target
power for a given ambient temperature.
Determining V
set
and Rated Power
V
set
, proportional to rated power, must be adjusted for actual ambient temperature at site as
described below. Use Figure 20, or use the following equations to determine the appropriate
V
set
and expected rated power at various ambient temperatures.
Factory test data for rated power and voltage are marked on the Data Plate that is located
inside the TEG cabinet door. These values are for a specific ambient temperature that is also
indicated on the Data Plate. They require correction for ambient temperatures different from
those indicated. The following equations apply: