Modes Of Operation; Setting Speed - Fantech SHR6904 Manuel D'installation

Modes of operation

1. Continuous / Ventilation Mode
In this mode of operation both fans are operating and exchanging 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 activated by an optional remote control. The "Low" and
"Med" fan speed selection will cause the unit to operate in continuous
exchange mode at a reduced exchange rate. Continuous mode is recom-
mended, since pollutants are slowly but constantly being generated in a
building.
2. Intermittent / Standby Mode
The system is always on standby and operates at high speed when acti-
vated by an optional remote control (required):<. "Standby" should be
selected if the user wishes to stop the unit from continuous exchange.
3a. Defrost (SHRXX04 Model) by evacuation
A preset defrost sequence is activated at an outdoor air temperature of 23ºF
(-5ºC) and lower.
During the defrost sequence, the supply blower shuts down & the exhaust
blower continues to ventilate for a preset time. The unit then returns to
normal operation, and continues the cycle.
3b. Defrost (SHRXX05R Model)
A preset defrost sequence is activated at an outdoor air temperature of
-5ºC (23ºF) and lower.
During the defrost sequence, the motorized damper in the bypass module
(BPM) temporarily blocks the incoming fresh air stream so that the warm
air from the room can circulate through the HRV. The exhaust blower shuts
down and the supply blower switches into high speed to maximize the
effectiveness of the defrost strategy. During this cycle, the unit will not
create a negative pressure. Please note that these systems are configured
to defrost with the BPM devices installed on the fresh air from outside port.
Alternate configuration are available by contacting our technical support
department.

Setting speed

The ERV is shipped from the factory on low speed, intermittent operation can be obtained by toggling switch located on outside of cabinet. External
low voltage contacts allow for high speed operation when optional remote control is used.
Stale Air
to Outside
Recirculate Air from Inside
11
Stale Air
from Inside
Supply air
to building