Nu-Air Ventilation Systems Inc. - HRV Operating & Installation Manual
Rev. 3.4 Sept. 20, 2011 - 17 -
4.2.4. ES-M3 - Control
ES Series units are equipped with a recirculation system that will not recycle bathroom air. The re-
circulation function of the ES-M3 enables you to re-circulate air for 40 minutes of every hour and is
recommended for homes with radiant or hybrid heating systems where constant circulation alleviates
stratification and dead zones. See Section 10.4 for wiring diagram.
Functions:
1. No LED: HRV/ERV is OFF
2. Stby: Unit is in standby, ready for a command
3. Lo: Unit operates in low speed continuously
4. 20 Lo/40 Rec.: Unit cycles between 20 minutes continuous low and 40 minutes recirculation.
4.2.5. ES-M4
The ES-M4 control offers the simplicity of the ES-M1, with the added convenience of full-time
recirculation mode. See Section 10.4 for wiring diagram.
Functions:
1. No LED: HRV/ERV is OFF
2. Stby: Unit is in standby, ready for a command
3. Lo: Unit operates in low speed continuously
4. Rec.: Unit operates in full-time recirculation with no outdoor air exchange.
4.3. Windsor Series Controls & Switch-Based Control Options—24V
All Windsor Series and other 24V controls connect to the 24V (10-wire) removable terminal block.
See Section 10 for wiring diagrams.
4.3.1. Standard Dehumidistat (Part # DSTAT-1)
With this basic control the system is designed to operate on a low speed for continuous ventilation. The
dehumidistat will switch the HRV to high speed when the relative humidity of the air around it exceeds
its set point. When the indoor humidity falls below the set point, the machine drops out of high speed.
The standard dehumidistat can be complemented with Win-20 timers, or any of the ES Series controls.
See Section 10.5 for wiring diagram.
4.3.2. Windsor Control (Part # WIN-1)
The Windsor Dehumidistat Control provides the same humidity control as the Standard Dehumidistat,
with the added functionality of a 3-position switch from which the operator can select three operating
modes. See Section 10.6 for wiring diagram.
1. OFF - disables all functions.
2. STANDBY - HRV is on standby (intermittent). High speed ventilation on demand from the
dehumidistat, or remote timers. i.e. Automatically resumes Standby mode after demand is
met.
3. CONTINUOUS - continuous low speed ventilation. HRV cycles to high speed on demand
from the dehumidistat or timers. i.e. Automatically resumes Continuous mode after demand
is met.
Also, the Windsor Control has a two position switch from which you can choose:
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