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SELECTION PROCEDURE
1. Determine cooling and heating requirements at design
conditions.
Example:
Total cooling capacity ............43,600 BTUH [12.78 kW]
Sensible cooling capacity ......34,000 BTUH [9.96 kW]
Condenser entering air ..........95°F [35°C]
Evaporator entering air ..........63°F [17°C] wb/76°F [24°C] db
Indoor air flow ........................1600 CFM [755 L/s]
External static pressure..........1.1 in wg
Required efficiency ................13 SEER
2. Select unit to meet cooling requirements.
Since total cooling is within the range of 4 ton [14.07 kW] unit and
requires 13 SEER efficiency level, enter cooling performance
table, at 95°F [35°C] outdoor temperature, 63°F [17°C] wb enter-
ing indoor air, and 1600 CFM [755 L/s]:
Total capacity..........................46,700 BTUH [13.68 kW]
Power input ............................3.3 kW
And also, at 76°F [24°C] db indoor entering air, and using the for-
mula at the bottom of the page:
Sensible capacity....................33,710 BTUH [9.87 kW]
3. Determine blower speed and power to meet the system
requirements.
At the given external static pressure of 1.1 in wg, the belt model
must be selected. Enter the belt drive blower performance table
at 1600 CFM [755 L/s] and 1.1 in wg ESP:
RPM ..................1205
Watts ..................725
Drive ..................M
4. Calculate indoor blower BTUH heat effect.
BTUH = Watts x 3.413 = 2474
5. Calculate net cooling capacities.
Net total cooling = 46,700 – 2474 = 44,226 BTUH [12.96 kW]
Net sensible cooling = 33,716 – 2474 = 31.242 BTUH [9.16 kW]
Accessory Shipping—lbs [kg]
Economizer 142 [64]
Power Exhaust 30 Est. [13]
Fresh Air Damper (Manual) 11 [5] 9 [4]
25 Est. [11]
130 [59]
Operating—lbs [kg]
Fresh Air Damper (Motorized) 13 [6]
Roof Curb 8" 84 [38]
Roof Curb 14" 92 [42] 88 [40]
80 [36]
11 [5]
Roof Curb 24" 108 [49] 104 [47]
Horizontal Economizer 90 [41] 80 [36]
WEIGHTS
A B C D
23% 27% 23% 27%
Capacity Tons [kW]
3-5 [10.6-17.6]
Corner Weights by Percentage
38
1
/4 [972] 25
3
/4 [654]
3-5 [10.6-17.6]
Capacity Tons [kW] A in. [mm] B in. [mm]
CENTER OF GRAVITY (C.G.)
[ ] Designates Metric Conversions
*Allow 57” for economizer on duct side.
33
UNIT DIMENSIONS—RJNA- SERIES