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RT-PRC017-EN10
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Procedures - SI Units
Cooling Capacity
Step 1 — Calculate the building’s total
and sensible cooling loads at design
conditions. Use the Trane calculation
form or any other standard accepted
method.
Example: The following are the building
cooling requirements:
a. Electrical Characteristics: 380-415/50/3
b. Summer Design Conditions: Entering
Evaporator Coil: 27° DB/ 19° WB
Outdoor Ambient: 35°
c. Total Cooling Load: 16.5 kW
d. Sensible Cooling Load: 11.8 kW
e. Airflow: 3400 m
3
/h External Static
Pressure: 125 Pa
f. Downflow Configuration
Step 2 — Size the equipment using Table
PD-1 to match the cooling loads at
design conditions.
Table PD-1 shows that a YSC060AD has
a gross cooling capacity of 17.8 kW and
14.4 kW sensible capacity at 35 DB
ambient and 3400 m
3
/h with 27 DB/ 19
WB air entering the evaporator.
Use the following formula to calculate
fan motor heat, which can be found in
the notes in Table PD-8:
Fan motor heat (kW)
= 1.144 x (Fan kW) + 0.132
For example: With 3400 m
3
/h and 125 Pa,
specified by the engineer, Table PD-8
shows 0.73 kW for a high heat model.
Fan motor heat =
1.144 x 0.73 + 0.132 = 0.97kW
Net Total Cooling =
17.8 kW - 0.97 = 16.8 kW
Net Sensible Cooling Capacity
14.4 kW - 0.97 = 13.4 kW.
Heating Capacity
Step 1 — Calculate the building heating
load using the Trane calculation form or
other standard accepted method.
Step 2 — Size the system heating
capacity to match the calculated
building heating load. The following
are building heating requirements:
a. Total heating load of 17.6 kW
b. 3400 m
3
/h
c. Fuel - Natural gas
For the YSC060AD there are two
heating capacities available, 19.6 kW
and 29.3 kW input models shown in
Table PD-32. The output capacities of
these furnaces are 15.7 kW and 23.4 kW
respectively. The high heat model with
23.4 kW best matches the building
requirements, indicating a YHC060AD*
should be selected.
Air Delivery Selection
External static pressure drop through
the air distribution system has been
calculated to be 150 Pa. Enter Table PD-
8 for a YSC060AD*H at 3400 m
3
/h and
150 Pa static pressure. The standard
motor will give the desired airflow.
Accessory Selection
Select accessories needed to
accommodate the application.