Solar Thermal Information

15
B A
DHW storage tank
VENT
solar
circulation
station
(P1)
solar collector array
relay R1
outdoor
temperature
sensor
low temperature
radiant panel circuits
T
DHW
cold water
Aux. storage tank
air vent
w/ shut off
valve
electric
element
AB
B
A
outdoor
reset
controller
(P2)
(C2)
(C3)
outdoor
temperature
sensor
(D1)
(D2)
room
thermostat
collector sensor (S1)
tank
sensor
(S2)
diverter
valve
aux.
sensor
(S3)
P&T
AB
(P3)
Supply water temperature (ºF)
Outdoor temperature (ºF)
70
90
110
130
70 60 50 40 30 20 10 0 -10 -20
contacts on reset controller
close to enable boiler
as heat source
120
100
80
5ºF
differential
(shown)
calculated target temperature
solar tank supplies heat
boiler supplies heat
contacts on reset controller
open to allow solar tank
to serve as heat source
boiler supplies heat when
temperature is climbing. Solar 
storage supplies heat when 
temperature is dropping
figure 4-1
figure 4-2