Operation; Modes Of Operation - Robertshaw SHR Série Manuel D'installation, D'utilisation Et De Maintenance

OPERATION

A Heat Recovery Ventilator (HRV) is designed to bring fresh air into a building while exhausting an equal amount of stale air. During the winter
months, the incoming cold fresh air is warmed by utilizing the heat recovered from the stale air before it is exhausted to the outdoors. During
summer months when the indoor space is air conditioned, the HRV will help in cooling the incoming fresh air with the stale air that is being
exhausted.
Robertshaw HRV's are designed to run continuous or on intermittent, giving the homeowner complete control over their air quality. Continuous low
speed ventilation is recommended, which will help eliminate carbon dioxide, voc's and other gases as well as freshen up the home. Below are some
examples of seasonal operation of an HRV.
Winter:
Humidity control is very important during the winter
months. This is when problems will be most apparent
since condensation on the windows will often occur. The
colder the outside temperature, the greater the risk of
condensation in the home. The average relative humidity
should be maintained between (30-60) to avoid conden-
sation. Low speed continuous ventilation with high speed override is rec-
ommended.
Summer:
The air is sometimes hot and humid. To stop the warm
humid air from entering, set the dehumidistat at its
highest level. If the Intellitek series controller is
installed, the air exchanger can be set to cycle the unit
on and off as desired from that wall control. However,
continuous ventilation is recommended.

MODES OF OPERATION

The entire line of SHR(D) / SER series Heat Recovery & Energy Recovery Ventilators comes equipped with Robertshaw's new electronic uni-control
board which offers a wide variety of features making it the ultimate ventilation control system. Robertshaw engineers have used the latest technolo-
gy to provide solid, trouble free operation under any conditions.
An on-board diagnostic LED helps find problems quickly and efficiently. For example the LED can be used to signal a broken or shorted electronic
wall control wire. Electronic air temperature probe gives this board accurate readings in order to minimize unnecessary defrost operation, and the
on-board jumpers provide the user with the option of adjusting defrost time and sequence to optimize performance under abnormal conditions. The
defrost operation is automatic and is usually never adjusted.
Air from
Outside
Air to
Outside
air at the rate you select, either at low or medium speed, and switches
to high speed when activated by an optional remote control. The "Low"
and "Med" fan speed selection will cause the unit to operate in continuous
exchange mode at an exchange rate of 35% and 50% maximum airflow
rating respectively. Continuous mode is recommended, since pollutants
are slowly but constantly being generated in your house.
Air from
House
House
the supply air stream temperature goes below -5°C (23°F), the exhaust
motor shuts down, the supply motor goes to high speed, and a damper
closes the supply, opening a 5th collar. The ambient air is then
recirculated through the unit & home for a period of 5 minutes. The unit
will then resume normal operation for a time period of 25 minutes. This
damper defrost cycle continues until the supply air stream rises above
0°C (32°F).
1. Continuous / Ventilation Mode
Air from
House
In this mode of operation both fans
are operating and exchanging air with
the outside. The heat recovery venti-
Air to
House
lator (HRV) constantly exchanges the
2.Defrost/Recirculation Mode
(5 port "R" Models)
The automatic defrost cycle SHR R(D)
models of HRV consists of a damper
Air to
defrost which allows air to recirculate
throughout the unit & home. When
Spring:
Temperatures are more moderate and become
warmer each day. To keep the humidity and tem-
perature uniform, set the dehumidistat higher (if
installed). You may also switch the HRV to standby
mode if desired.
Fall:
Rain and rapid temperature changes make it diffi-
cult to control the internal humidity level and may
result in condensation on the windows. A remote
dehumidistat may help give greater control over the
inside environment.
Air from
Air to
outside
supply motor shuts down and the exhaust motor goes into high
speed. Ambient air is passed through the unit for a period of 5
minutes. The supply motor will then re-start and run at the preset
speed. The exhaust motor will also slow down to the preset speed,
and the unit will operate in the run cycle for 25 minutes. This fan
shutdown defrost cycle continues until the supply air stream rises
above 0°C (32°F).
3. Defrost (Fan shutdown 4 port
House
models)
The automatic defrost cycle con-
sists of a fan shutdown. When the
supply air stream temperature
goes below -5°C (23°F), the
5