3.3.0. Storage Sensor Panel Removal and Installation
3.3.1. Collector
Sensor Installation
HPAK INSTALLATION INSTRUCTIONS
15
S O L A R H O T W A T E R
Helio-Tank 119
Tank Interconnect
CTOR 000 000
Helio-Tank 119
Standard Solar 119
Collector Sensor
Figure 3.2.-1: HPAK with Multiple Helio-Tank 119
Figure 3.2.-2: HPAK with Multiple Standard Solar Tanks
3.3. Sensor Installation
HPAK’s come with the necessary sensors pre-wired into the control; for more information see the separate control manual. The controls
require at least one tank sensor: on the bottom of the storage tank; the top tank sensor is optional. Most solar storage tanks have a stud near
the bottom for placement; the Helio-Tanks have studs for both top and bottom. If a specific area is not available, attach to a metal drain,
disconnected lower element, or use the cold in for lower tank sensor; use the hot out for a top tank sensor. The collector sensor must go on
the outlet header of the array.
For Pro models
: the energy production is default set to calculate via the collector outlet sensor and the pre-installed flow meter temperature and flow sensor. For greater accuracy, install
an additional thermistor sensor just above the inlet to the heat exchanger and connect to T4 at the Delta-T Pro. See the hydraulic schematic on the opposite page for T4 position.
3.2. Plumbing Multiple Tanks
If using multiple tanks to achieve proper storage ratio, always use reverse return plumbing with the cold lines the longest, to ensure least
heat loss, and that each tank gets the same amount of circulation. For Helio-Tanks, use the 119 and connect all 2” side ports for increased
layering and higher performance.
