PLUMBING THE HPAK
4. PIPING
1
2
13
7
8
17
4
5
15
10
19
3
14
9
18
6
16
12
11
20
Figure 4.0.-1: Typical HPAK Installation Schematic
S
12"
18"
S
T
T
P
M
M
4
12
5
13
6
14
15
16
7
18
9
8
17
10
11
3
2
1
S
S
M
M
P
Air Vent
Tempering Valve
Collector Sensor
Expansion Tank
Gobi Collector
Combo Valve: Cold
Filling Valve
Flow & Temp Meter
Combo Valve: Hot
Collector Pump
150 psi PRV
Storage Pump
Pressure Gauge
Tank Sensor
P & T Valve
Normally Open Valve
HSTG Solar Storage
Normally Closed Valve
Optional Isolation Valve
Bypass Valve
17
S O L A R H O T W A T E R
4.0. Connect the HPAK to the Tank
Insulate all hot water piping, as well as the final five feet of cold water storage inlet piping to a minimum R2.6. To enable backup heat
during solar system maintenance, isolation and shut off valves must be installed as recommended in installation schematics below. Use
dielectric unions when connecting piping to the storage tank nipples. When using the Helio-Tank, appropriately sized flex hoses can be
purchased from Heliodyne to avoid rigid copper plumbing. In the case of standard storage tanks, Heliodyne Gas Tank, or multiple tanks,
this is unavoidable.
When using the Helio-Tank, the DHW Cold is shared with the HPAK Cold. NEVER share the hot DHW and HPAK to prevent cold water
entering the hot line.
4.1. Connect the PRV to
Hose for Drain
The PRV comes with a barbed hose
fitting to attached a 1/4” ID hose for
funneling glycol to a bucket or drain, in
the rare even of release. Since this is
not part of a pressurized system, there
is no need to use expensive copper;
PEX or other high temperature suitable
plastics are okay here only.
In the even of a pressure release,
contact Heliodyne to discuss expansion
tank sizing.
*A combo valve is an integrated temperature gauge,
ball and check valve. The ball valve can be operated
as described in the components section 1.6.3 above
and is normally open.
