9
July 2020
ten minutes.
7.
Discharge any air caught in the air trap
using the Schrader valve located below the
collector pump
8.
Repeat previous steps until no air is
discharged.
9.
Close drain valve.
10.Continue charging until it reaches the
necessary pressure for the system
’
s
configuration.
11.Close the fill valve.
12.
Turn off and disconnect charging pump
.
Note: It is recommended to install commissioning
automatic air vents as provided in SunEarth Add
-
a
-
row and systems kits on each collector bank.
Two weeks following system commissioning the
solar circuit pressure should be verified and
increased if needed with the automatic air vent
isolation valves being closed and plugged with
the commissioning air vents being removed .
3.4. CONTROLLER SETUP
Once 120VAC powered select AUTO via the
ON/OFF/AUTO switch on the side of the
controller will illuminate. No other setup of the
controller is necessary for the system to
function in automatic mode. Tuning of the
system controller is possible referencing the
SETR 0301U instruction manual.
4.1. SYSTEM IDLING
Solar water heating systems can reach very
high temperatures when there is no daily hot
water usage on the system. If a short summer
vacation is planned, the SETR 0301U
differential temperature controller has a
vacation function which, when activated, will
dissipate heat at night. See the control manual
to activate this function. Remember to
deactivate this function upon returning system
to operation!
During extended idling 6 weeks or more it is
advisable to either cover the solar collectors
with an opaque material or to manually drain
the collector loop HTF. SunEarth recommends
that you cover the collectors if practical.
If you choose to drain the HTF in the solar
array loop follow these steps:
1.
Turn the system MASTER ON/OFF/AUTO to
the
“
OFF
”
position.
2.
Attach a hose to the solar array loop drain
valve. Secure the other end to a suitable
storage container with volume capacity
larger than the solar array loop volume.
WARNING!
Solar heat transfer fluid may
be under high temperature and pressurized
extreme care should be taken as HTF may
turn to steam when exposed to atmospheric
pressure.
3.
Carefully open the drain valve.
Warning!
DO NOT dispose of the heat transfer
fluid on the ground or in the water system.
Collect it in a container which can be sealed
and dispose of it according to the
manufacturer
’
s directions.
4. EXTENDED NON
-
USE PROCEDURES
Percent By Volume
-
Dow Frost HD
Temperature (°F)
Freeze Protection
20
18%
10
29%
0
36%
-
1
42%
-
20
46%
-
30
50%
-
40
54%
-
50
57%
-
60
60%
Table 3.3.1: HTF Concentration
