Trane PTEC-070 Operation & Maintenance Manual page 31

PTEC-M-1A
Refrigeration
System
Example:
Assume that a PTHC15 230/208V
with 3.5 kW electric heater is under
test.
1. Supply voltage as recorded - 208V.
2. Watts recorded -2750W or Amps
recorded - 13.5 Amps.
3. Locate the readings listed on page
11. You will note that these
readings fall within the voltage,
watts and amp draw minimum
and maximum ranges listed and
therefore the unit heating
performance would be considered
normal.
Heating Wattage Test (Heat Pump
Mode Only)
For the heating wattage, the
following readings must be recorded
after the unit is interconnected with a
wattmeter.
• Outside coil inlet air dry bulb
temperature.
• Inside coil inlet air dry bulb
temperature.
• Total watts input measured by
wattmeter.
Calculating procedure
1. Locate temperature obtained in
Step A of cooling performance
test in first column of Heating
Wattage Chart.
2 Locate in second column the inside
coil inlet D.B. temperature.
3. The total watts input should come
between minimum and
maximum values indicated for
each model.
Example:
Assume that a PTHC15 is under test.
Proceed as follows and observe test
readings as simultaneously as
possible.
1. Outside coil inlet D.B. temperature
readings as described above: 45°F.
2. Check watts input: 1370 W
3. Inside coil inlet D.B. temperature
reading as de scribed in Step B:
75°F.
Read to the right from the 75° inside
coil inlet D.B. value in the column
and note the minimum and
maximum wattage of 1335 - 1470.
Since the wattage reading (1370)
obtained in the test is within the
prescribed range, the total power
input in watts is considered to be
normal.
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