Watts AERCO Edge [ii] User Manual

Edge [ii] Controller Operation Manual
Appendix A: Indoor/Outdoor Reset Ratio
OMM-139_E • 8/25/2020 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 194 of 196
Reset Ratio Formula
Calculate Set point based on Outdoor temperature:
Water Temp Current =
(Outdoor Current - Outdoor P1) x (Water SP Temp P1 - Water SP Temp P2) + Water Temp P1
(Outdoor P1 - Outdoor P2)
EXAMPLE:
What is the Current Water SP Temp when Outdoor Current is 30 °F?
Water Temp Current = (30 – 60) x (100 – 185) + 100 = -30/70 x -85 + 100 = 136.4 °F
(60 – (-10))
Reset Ratio Application Suggested Startup Settings
Application
P1
Outdoor
P1
Water SP
P2
Outdoor
P2
Water SP
Warm Weather
Shutdown
Radiators / baseboard
70
100
-20
190
65
Radiant (High mass (Concrete)
70
90
-20
140
65
Radiant (Low mass (Joists)
70
90
-20
120
65
Air handler
70
90
-20
140
65
Fan Coil
70
90
-20
140
65

Watts AERCO Edge [ii] Specifications

General

Brand	Watts
Model	AERCO Edge [ii]
Category	Controller
Language	English