4.1.1.1. relay two Aquastat Operation (cL combination System Only)
To use relay two in aquastat operation, with or without thermostat input, ensure ‘Closed Loop
Combination’ system is active in the SYSTEM bar. Inputs will be inactive without this system set.
FUNCTION DESCRIPTION
DEFAULT
SETTINg LIMIT
The temperature the selected sensor must exhibit to turn R2 ON. If this
temperature is less than the R2 OFF temp, R2 will be ON in between the
OFF and ON temp; otherwise, it will be ON above the R2 ON temp, and
turn back off at the R2 OFF temp
120°F
50°F
≤
V
≤
200°F
The temperature the selected sensor must exhibit to turn R2 OFF. See
above if R2 OFF > R2 ON.
110°F
50°F
≤
V
≤
200°F
The installed sensor for reading the ON and OFF values set above.
T2
T1
≤
v
≤
T7
Select any thermostat channel as an extra condition for operation of
R2. E.g. turn on R2 only if the temperature conditions set above AND a
selected thermostat is active. Leave unchecked for temperature condition
only.
No Channels
Active
Any or all
channels
active
4.1.1.2. relay three Operation: Gas tank Operation
In a residential domestic water heating system, it is possible to use a single tank gas system
with solar, provided the gas tank has an electric ignition. Because this is a residential
function, it cannot be combined with commercial or space heating operations.
FUNCTION DESCRIPTION
DEFAULT
SETTINg LIMIT
Check this box if using a electric ignition gas fired solar storage tank
systems (EIgFSS), with power controlled by R3.
OFF
ON / OFF
In EIgFSS tank systems, the tank’s rated recovery rate in kBTU (1000 x
BTU)
74kBTU
30kBTU
≤
V
≤
120
In EIgFSS tank systems, the limit Value at which T2, or T3 if installed, will
disable R3, preventing any backup energy
120°F
80°F
≤
V
≤
140°F
In EIgFSS tank systems, the estimated household demand in gallons used
per day
80gAL
40
≤
V
≤
140gAL
4.1.1.3. relay three Operation: timer relay Operation
Relay three can be used to operate on a time setting.
FUNCTION DESCRIPTION
DEFAULT
SETTINg
LIMIT
Check this box if using R3 as a timer relay. Relay capacity is 30A,
240VAC.
OFF
ON / OFF
At the top of this hour Value, i.e. 8:00 or 8 AM, R3 will shut OFF. The
clock is a 24-hour clock.
8:00
0
≤
V
≤
23
At the top of this hour Value, i.e. 17:00 or 5 PM, R3 will turn ON. The
clock is a 24-hour clock.
17:00
0
≤
V
≤
23
FIg. 4.1.1.1
FIg. 4.1.1.2
FIg. 4.1.1.3
CHanGInG ConTRolleR oPeRaTIon seTTInGs
13
S O L A R H O T W A T E R
System 4
120
