Trane PTEC-070 Operation & Maintenance Manual page 30

30
Refrigeration
System
For The Cooling Wattage Tests
(wattage) the following additional
readings must be recorded after the
unit under test is interconnected
with a wattmeter.
• Outdoor air dry bulb temperature.
Avoid direct exposure of
thermometer to sunlight or to hot
condenser discharge air.
• Total watts input, measured by
wattmeter or calculate by
multiplying applied voltage by the
unit's amp draw.
Calculating Procedure
1. Locate the outside air dry bulb
temperature obtained in the first
column of the Cooling Wattage
Test.
2. Locate in the second column the
return air wet bulb temperature
obtained in the Cooling
Performance Test.
3. The total watts input should come
between minimum and
maximum values indicated for
each model.
Example:
Assume that a PTHC15 is again
under test. Proceed as follows and
observe test readings as
simultaneously as possible.
1. Outdoor air dry bulb temperature
reading - 95°F.
2. Check watts input - 1510. 3. Wet
bulb temperature as described in
Step C; 75°F.
In the column headed Outdoor Air
Dry Bulb Temperature of the Cooling
Wattage Test find the 95°F value.
Read to the right from the 95°F value
and find the room wet bulb
temperature (75°F).
Read to the right front the 75°F W.B.
value in the PTHC15 column and
note the minimum and maximum
wattage of 1460 - 1575.
Since the wattage reading (1510)
obtained in the test is with in the
prescribed range, the total power
input in watts is considered to be
normal.
Electric Heat Test
For the electric heat test, the
following readings must be recorded
after the unit is interconnected with a
wattmeter or by recording the total
amp draw to the unit.
Note: Cabinet front must be in place
during this test.
• Record supply voltage to unit.
• Operate unit in highest heat
setting.
• Record wattage recorded on
wattmeter or total amp draw to
unit.
• Refer to the Electric Heat Capacity
and Electrical Data on page 11
(whichever is applicable for voltage
rating on the unit being tested.)
• The total watts or amps recorded
should fall with in the minimum
and maximum watts/amps listed
on these charts.
PTEC-M-1A