I have an HRV (heat recovery ventilator) which has a bathroom booster switch input. The HRV supplier specified a SPDT momentary switch for the bathroom booster switch. 18/2 shielded wiring is specified for the switch to HRV.
The SPDT switch has three screws plus a ground. The supplier told me that I should jumper the screws on the same side together and then use 1 wire on the left side of the switch and one on the right side of the switch. Does the jumpering really just turn this SPDT switch into a SPST switch? I asked why they didn't specify a SPST momentary switch and their answer was it was out of stock. My other thought was the dual throw could be used to later install a CO2 sensor in the bathroom and that could be another input to the switch to cause it to activate the boost mode - not sure if that is accurate.
SPDT wiring diagram in the following link. The jumper goes from A1 to B1.
I have the leviton 56081 2w switch. The way I understand this working is that when the momentary switch is activated a timer on the HRV puts the unit into boost mode for 5 minutes. I imagine that the momentary rocker switch automatically turns itself off so really it makes a contact and then breaks the contact - is that correct?
The manufacturer quick guide says don't use a standard single pole single throw switch.
The manufacturer documents says the switch is 1mA (lmax).