Johnson Controls JRE Series, Installation Operation & Maintenance

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W A T E R - S O U R C E H E A T P U M P S
JRE-Series
R e v. : A u g u s t 1 9 , 2 0 2 0
I n s t a l l a t i o n , O p e r a t i o n , M a i n t e n a n c e 32
Blower Performance Data – Units w/ Condenser Hot Water Reheat
Coil Face
Velocity
FPM
JRE with Reheat - ESP Loss
JRE036 & 048
in. of Water
JRE060 & 072
in. of Water
JRE096
in. of Water
JRE120 & 144
in. of Water
JRE168 & 240
in. of Water
175 - - - - -
200 0.17 0.17 - - 0.15
225 0.18 0.18 - - 0.16
250 0.20 0.20 0.19 - 0.18
275 0.21 0.21 0.20 0.20 0.19
300 0.22 0.23 0.22 0.22 0.21
325 0.23 0.24 0.23 0.23 0.22
350 0.25 0.26 0.24 0.25 0.24
375 0.26 0.27 0.25 0.27 0.25
400 0.27 0.29 0.27 0.28 0.26
425 - 0.30 0.28 0.30 0.28
450 - 0.31 0.29 0.32 0.29
475 - - - 0.33 0.31
500 - - - 0.35 0.32
525 - - - 0.37 -
550 - - - 0.38 -
575 - - - 0.40 -
Example:
Reheat coil loss can be determined from the above table. Coil velocity (FPM) = Airflow (CFM) / Face Area (sq. ft.)
1. JRE036 has a face area of 5 sq. ft. (see physical data table).
2. At 1,500 cfm, coil velocity (FPM) = 1,500 / 5 = 300 FPM
3. From above table, ESP is .22.
4. JRE036 (without reheat) C Drive at .6 ESP, 3.0 turns = 1,500 cfm
JRE036 (with reheat) C Drive at .82 ESP, 3.0 turns = 1,400 cfm
If drop in CFM is not acceptable, adjust turns to 2.0 for 1,500 CFM.
Note - Sometimes drive package must be changed.
Air Coil Face Area
Model Square Feet
JRE036 - 048 5.0
JRE060 - 072 7.0
JRE096 9.3
JRE120 - 144 10.5
JRE168-240 20.0
Note: For blower performance, see unit IOM or submittal.