Operation - Honeywell Perfect Window ER200 Instruction Manual

The ON/OFF illuminated rocker switch located on the
side of the cabinet should be on at all times except
when providing routine maintenance or servicing the
unit.
A fresh air control located at a remote location turns the
unit on and off and allows continuously variable
selection of ventilation rates. Airflow rate is determined
by the specific application, the number of occupants
and the design of the ductwork system. Gradually
adjust the airflow rate until the desired comfort level is
attained.
Setting Frost Control Temperatures
CAUTION
Only an authorized appliance repair or service
technician should make adjustments to the frost
control preheat temperature.
The preheat temperature is factory set to an inlet air
temperature of 10°F (-12°C). This setting protects the
desiccant coated energy transfer wheel from freezing at
indoor relative humidities of up to 40 percent. This setpoint
can be changed by rotating the slotted potentiometer
extension arm. The arm is accessible at the end of the
temperature control module attached to the underside of the
fresh air blower cover. (See Fig. 11.)
For high indoor humidity conditions such as pool or spa
applications and outdoor temperatures at or below 10°F (-12°C),
the preheat setpoint can be adjusted to maintain up to 15°F
(-9°C) inlet air temperature (suitable for 50 percent indoor
RH). This is accomplished by rotating the potentiometer
extension arm clockwise to the stop mark at 50 percent, 15°F.
Many buildings require humidifiers to maintain comfortable
indoor relative humidities at approximately 30 percent, and
many operate throughout the winter season at 20 percent or
lower. In these situations, greater energy savings can be
attained with lower preheat temperatures. To accomplish this,
rotate the field adjustment potentiometer counterclockwise to
the stop.
This will establish a 0°F (-18°C) temperature set point, which
is acceptable when maximum indoor relative humidity will be
20 percent or less.
ER200 PERFECT WINDOW
Fig. 11. Temperature control module adjustment.

OPERATION

The Fresh Air Ventilation System has an energy transfer
wheel that rotates between two counter-flowing air streams
(supply and exhaust). The wheel picks up heat from one side
and gives it to the other (cooler) air stream. This causes a
temperature gradient through the wheel from the warm side to
the cool side.
11
™
FRESH AIR VENTILATION SYSTEM
POTENTIOMETER
EXTENSION ARM
TEMPERATURE
CONTROL
MODULE
M8041
68-0131—2