Specifications

PRO-C Series
4
Selection Procedure
The selection of the PRO-C Series is governed by two
parameters: the amount of outside air needed to be pre-
conditioned and the Carrier unit to which the PRO-C is to
be mated shown in Table 1. Only a specifi c size PRO-C will
mate to a Carrier unit. Nominally, the PRO-C will provide
between 30% and up to 100% of outside air. There is a
limited product combination which will allow 100% outside
air applications.
Table 4. Unequal Airflow Efficiency Correction.
Ratio of
SA Flow to
RA Flow
Base Effectiveness
68 70 72 74 76 78 80
0.7 82.6 84.0 85.5 87.0 88.5 90.0 91.4
0.8 78.0 79.8 81.5 83.2 84.9 86.7 88.4
0.9 73.2 75.1 77.0 78.9 80.8 82.7 84.7
1.0 68.0 70.0 72.0 74.0 76.0 78.0 80.0
1.1 66.1 67.9 69.6 71.4 73.1 74.8 76.6
1.25 62.4 63.8 65.2 66.6 68.0 69.4 70.8
1.4 58.5 55.9 60.7 61.8 62.9 63.9 65.1
Table 2. Airflow Range and Energy Wheel Area.
Model
Airfl ow Range
(scfm)
Wheel Face Area
(ft
2
/side)
PRO-C-1000 450-1110 1.23
PRO-C-2400 800-2600 2.46
Table 3. Unit Effectiveness vs. Wheel Face Velocity.
Wheel Face Velocity (fpm)
Total Recovery
Effectiveness (%)
300 80.3
400 77.8
500 75.3
600 72.8
700 70.3
800 67.8
900 65.3
1000 62.8
1100 60.3
PRO-C-1000 PRO-C-2400
Carrier
Weathermaster
48/50HJ004 48/50HJ008
48/50HJ005 48/50HJ009
48/50HJ006 48/50HJ012
48/50HJ007 48/50HJ014
Carrier
Weathermaker
48/50TM004 48/50TM008
48/50TM005 48/50TM009
48/50TM006 48/50TM012
48/50TM007 48/50TM014
48/50TF004 48/50TF008
48/50TF005 48/50TF009
48/50TF006 48/50TF012
48/50TF007 48/50TF014
Notes:
Refer to Pro Series Models when attaching rooftop units
larger than 12.5 tons (transition required) and when using
as a stand-alone ventilator.
Table 1. ERV Systems/Carrier Unit Combinations.
1. Determine Supply Side Recovery Efficiency
Enter Table 2 to determine the recovery wheel face
area per airstream. Divide the smaller volume of the two
airstreams by the wheel area obtained from Table 2 to
determine face velocity. Enter Table 3 for the face velocity of
the smaller airstream to determine the unit base effectiveness
at equal airfl ows.
If the airfl ows are not equal, then divide the supply air
volume by the return air volume to determine the airfl ow
ratio. Using the base effectiveness determined from Table
3 and the calculated airfl ow ratio, enter Table 4 to obtain
the corrected supply air efficiency for unequal airflow
applications.
Example:
Given a supply airfl ow of 965 and exhaust airfl ow of 1015. From
Table 2, the PRO-C wheel area per side is 1.23 sq. ft. Dividing 965
cfm (supply) by 1.23, gives a (supply side) face velocity of 785 ft/min.
From Table 3 the base effectiveness is interpolated at 68 percent. Using
the base effectiveness and an airfl ow ratio of 0.95 (965cfm/1015cfm)
from Table 4 determines the supply side effi ciency to be 70.6 percent.
2. Calculate the Supply Air Conditions
Once the design conditions are known and the supply
side effi ciency is determined, the temperature and humidity
content of the air supplied to the space can easily be
calculated by using Equation 1. Using dry bulb temperatures
in Equation 1 provides the supply air temperature. The
supply air humidity level is also determined in Equation 1 by
using grains of moisture or humidity content (lb. moisture/
lb. dry air). The enthalpy of the supply air can be calculated
in the same manner. Do not use equation 1 to calculate the
wet bulb temperature.