3
|
(800)-675-7410
|
https://www.pdhvac.com/support/
Description and Illustration of the Machine
O
PERATIONAL
I
NSTRUCTIONS
The purpose of this machine is to provide greater control of the air temperature
within the vehicle that it is installed (such as motor homes, caravans, recreational
vehicles, etc.). When the ambient outdoor temperature is hot and humid, it can
supply the vehicle with cool and dehumidified air via the refrigeration cycle.
It can also run this process in reverse, to supply heated air into the vehicle, whether
as a supplement, or replacement for the vehicle’s original heating system. In both
instances, the setting of the desired air temperature is configurable by the user.
Cooling Mode - Description of Operation
Heating Mode - Description of Operation
By changing physical state from liquid to gas, the
refrigerant heats or cools the components through
which it passes. The air that is drawn into the system
(the “return air”) by the fan blower
(C)
flows through
the evaporator which has been made signficantly cold.
The air then comes out cooled and removed of
humidity (the “supply air”).
This process repeated continuously over a long period
of time leads to a reduction in the air temperature
and humidity levels inside the vehicle.
The method of heating is quite similar to that of
cooling, however the process occurs in reverse.
The refrigeration cycle is reversed by the 4-way valve
switching over
(F)
. The internal coil becomes the
condenser rather than the evaporator, thereby heating
the air that passes through it.
This process takes more standby time as the internal
coil spends a few minutes heating up to begin working,
in addition to periodic defrost cycles from the machine.
The system is composed of:
(A) Compressor, (B) Condenser, (D) Evaporator, (F) 4-Way Valve
and Pressurized Refrigerant R410a.
Condensate Drain
Condensate Drain
(in Heating Mode)
Wall Controller
Evaporator (D)
Fan Blower (C)
Condenser (B)
Compressor (A)
4-Way Valve (F)
Flow of air introduced
from outside
Hot air
expelled
Treated air
reintroduced
into the vehicle
Flow of air
drawn from
inside the
vehicle