Fantech SHR 1504 Operation Manual - Modes Of Operation
MODES OF OPERATION
4
1. Continuous Ventilation Mode
In this mode of operation, both fans are operating and exchang-
ing air with the outside. The heat recovery ventilator (HRV)
constantly exchanges the air at the rate you select, either at
low or medium speed, and switches to high speed when acti-
vated 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.
The switch on the side of the unit is used to toggle between STANDBY, LOW speed and MEDIUM speed modes.
In order to activate HIGH speed, a jumper must be placed between the DEHUM + and DEHUM - contacts.
* no exchange of air
Air from
Outside
Air to
House
Air from
House
Air to
Outside
4. Defrost/Fan shutdown (4 port models)
The automatic defrost cycle for SHR/VHR models of HRVs con-
sists of a fan shutdown. When the supply air stream tempera-
ture goes below -5°C (23°F), the supply fan shuts down and the
exhaust fan goes into "High" speed. Ambient air is passed
through the unit for a period of 5 minutes. The supply fan will
then re-start and run at the presetspeed. The exhaust fan 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/Recirculation Mode (5 port “R” models)
The automatic defrost cycle for SHR R(D) / VHR R models of
HRVs consists of a damper defrost which allows air to recircu-
late throughout the unit & home. When the supply air stream
temperature goes below -5°C (23°F), the exhaust fan shuts
down, the supply fan 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 sup-
ply air stream rises above 0°C (32°F). The recirculation feature
can be obtained with the use of an optional EDF5 control.
2. Intermittent / Standby Mode (SHR(D) / VHR Series of HRVs)
The system is always on standby and operates at high speed
when activated by an optional remote control. "Standby" should
be selected if the user wishes to stop the unit from continuous
exchange. We recommend that the "Standby" mode only be used
if your system is equipped with an optional external control, in
which case, the unit would activate to "High" fan speed, until the
control is satisfied and then return to "Standby" (off).
Air from
House
Air to
House
Air to
Outside
Air from
House