Friedrich VRP12K, Service And Parts Manual

Page: 8 / 221

8 PB
INTRODUCTION
FreshAire™ Conditioned Fresh Air
Return Air
up to
70 CFM
Return Air
Filter
MERV 8 Outside
Air Filter
Supply Air
Outdoor Wall
Outdoor Air
Condenser
Exhaust Air
FreshAire is a dedicated fresh air system that brings in up to 70 CFM of outdoor air into the VRP® unit. The FreshAire system uses
one fan (up to 35 CFM) or two fans (up to 70 CFM) (depending on outdoor air CFM volume requirements) to bring in fresh outside air
into the the unit. The outdoor air passes through dedicated 6”x 6”x 1” MERV 8 filters that are easily replaceable from the front of the
unit.
This outdoor air is mixed with the return air inside the unit prior to the main evaporator coils, reheat coil and heater. Because of
the variable speed of both the compressor and evaporator fan, the VRP can increase or decrease the unit’s capacity to cool, heat or
dehumidify the total supply air. The system uses a proprietary algorithm to measure the dew point of the leaving air.
As the system nears the room setpoint, the system will throttle back both the compressor and the supply air volume in order to
maximize the dwell time on the indoor coil to maximize dehumidification.
(Single speed systems cycle on and off, providing less dehumidification capacity and run time as well as encounter condensate re‑
evaporation when cycled off.)
Figure 104 (FreshAire)