44
Calculating Procedure
1. Locate the outdoor temperature obtained in first column of
Total Power Consumption Cooling Chart.
2. Locate in second column the return air wet bulb tempera-
ture obtained in Step C.
3. The total watts input should come between minimum and
maximum values indicated for each model.
EXAMPLE:
Assume that a PTH15 is again under test. Pro-
ceed as follows and observe test readings as simultaneously
as possible.
1. Outdoor dry bulb temperature reading - 95°F.
2. Check watts input - 1510.
3. Wet bulb temperature as described in Step C - 75°F.
In column headed Outdoor Dry Bulb Temperature of the Power
Consumption Chart 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 PTH15 col-
umn and note the minimum and maximum wattage of 1460 -
1575.
Since the wattage reading (1510) obtained in the test is within
the prescribed range, the total power input in watts is consid-
ered to be normal.
Electric Heat Test
For the electric heat test, the following readings must be re-
corded 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 heating watts/amps chart. (Whichever is appli-
cable for voltage rating on the unit being tested.)
•
The total watts or amps recorded should fall within the
minimum and maximum watts/amps listed on these charts.
EXAMPLE:
Assume that a PTH15 230/208V with 3.5 kW elec-
tric heater is under test.
1. Supply voltage as recorded - 208volts.
2. Watts recorded -2750W or Amps recorded - 13.5 Amps.
3. Locate the readings listed on the following pages. You will
note that these readings fall within the voltage, watts and
amp draw minimum and maximum ranges listed and there-
fore the unit heating performance would be considered nor-
mal.
Heating Power Consumption Test (Heat Pump Mode Only)
For the total power consumption test, the following readings
must be recorded after the unit is interconnected with a watt-
meter.
•
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 in first column of
Heating Wattage Chart.
2. Locate in second column the inside coil inlet D.B. tem-
perature.
3. The total watts input should come between minimum and
maximum values indicated for each model.
EXAMPLE:
Assume that a PTH15 is under test.
Proceed as follows and observe test readings as simultaneously
as possible.
1. Outside coil inlet D.B. temperature readings as described
in Step A: 45°F.
2. Check watts input: 1370 W.
3. Inside coil inlet D.B. temperature reading as described in
Step B: 75°F.
Read to the right from the 75°F 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 consid-
ered to be normal.
See the charts on the following pages.
SERVICING
