System information

Carrier Geothermal Heat Pump Systems
49
Residential Products Technical Guide
Table 10: Blower Performance Data - 50YE Units With Whole House Dehumidifi cation (PSC Motor)
Coil Face
Velocity
FPM
50YEH/V/D with Reheat ESP Loss
50YEH/V/D
018
In. of Water
50YEH/V/D
024, 030
In. of Water
50YEH/V/D
036
In. of Water
50YEH/V/D
042, 048
In. of Water
50YEH/V/D
060, 070
In. of Water
200 0.037 0.033 0.031 0.028 0.026
250 0.052 0.046 0.042 0.038 0.034
300 0.077 0.066 0.059 0.051 0.044
350 0.113 0.096 0.085 0.073 0.061
400 0.181 0.160 0.145 0.131 0.117
450 0.242 0.226 0.215 0.205 0.194
500 0.360 0.345 0.335 0.326 0.316
For GT-PG units with Whole House Dehumidifi cation Reheat coil applications, calculate face velocity of the entering air.
From the table above, fi nd ESP for Reheat application.
The loss includes wet coil loss.
Example:
Reheat coil loss can be determined from the above table. Coil velocity (FPM) = Airfl ow (CFM)/Face Area (sq. ft.)
1) 50YEH036 has a face area of 4.86 sq. ft. (see physical data table in I.O.M.).
2) At 1,100 cfm, coil velocity (FPM) = 1,100/4.86 = 226 FPM
3) From above table, it will be necessary to subtract 0.037 from the blower performance ESP.
4) On medium speed, the 50YEH036 (without reheat - see blower table) can deliver 1,100 CFM at 0.28 in. wg. with the standard PSC
motor; with the reheat coil, it now delivers 1,085 CFM at 0.28 in. wg. or 1,100 CFM at 0.24 in. wg.
5) If the decrease in airfl ow is acceptable, no changes are necessary. Otherwise, high speed fan should be used to overcome the pressure
drop of the reheat coil.
Whole House Dehumidification