4 – Part
2:
General
information –
Preface
Preface
The VELUX solar water heating system uses the sun’s energy as a source of heat to produce hot water for domestic household
use. Designed to meet the certifi cation requirements of SRCC 0G-300, VELUX solar water heating systems are reliable, and
can typically generate from 50% to 80% of your annual household water heating needs free from the sun. Your remaining
hot water needs can be supplied by a suitable backup or auxiliary energy source . Results will vary based upon on your specifi c
region in the country.
Introduction
The system performance varies as a function of the household hot water load. The ambient air temperature, the roof pitch and
orientation along with seasonal solar intensity will determine the amount of hot water generated by your VELUX solar water
heating system.
Your VELUX solar water heating system uses a circulation pump that circulates a propylene glycol heat transfer fl uid
throughout the system. This fl uid protects the collector piping from freezing, prevents corrosion of system components, and
keeps scale deposits from forming that could reduce the performance of the system. Proper maintenance of the propylene
glycol in the system can protect the solar water heating system to minus 40° Fahrenheit. This manual is intended to familiarize
you with the proper installation and maintenance of your VELUX solar water heating system. This system must be installed by
a licensed solar or plumbing contractor in accordance with SRCC Standard OG-300 and all applicable national, state and local
codes. Failure to follow the procedures described in this manual can void the manufacturers’ warranty.
System description
The VELUX solar water heating system is a closed-loop active solar system which, when installed with a suitable auxiliary
heat source, can act as the primary source of domestic hot water for residential use. The system components provided with
the VELUX solar water heating system include the solar collectors, collector fl ashings, solar loop pipe and fi ttings, solar
storage tank, solar pump station and controller, temperature sensors, expansion tank, microbubble air separator, mixing valve,
and non-toxic propylene glycol heat transfer fl uid. The solar collector is the engine of the VELUX solar water heating system .
When the sun is shining, the heat energy is absorbed by the solar collector and transferred to the heat transfer fl uid circulating
through the solar collectors. The system pump effi
ciently circulates this heated fl uid through the collector’s piping and the
heat exchanger located in the solar storage tank. As the heat transfer fl uid passes through the heat exchanger, the heat in the
fl uid is transferred by conduction to the potable water in your solar storage tank causing the temperature in the tank to rise.
This process continues as long as the sun is shining or until the temperature in the solar storage tanks reaches its maximum
temperature set point.
Specifi cations
The VELUX solar water heating system is designed to produce domestic hot water from either solar collectors, an electrical
backup, a gas backup, or a boiler back up (provided by others). The VELUX systems can also be used as a solar preheat system
to conventional electric, gas, or tankless water heaters (provided by others).
Collectors and fl ashings
VELUX solar collectors and fl ashings allow for a low profi le, roof integrated, solar panel installation. The VELUX collector is
made up of copper tubes and a copper plate that is covered with a highly selective absorber coating; this assembly is enclosed
in a well insulated aluminum frame or “box” and covered with low-iron tempered glass glazing. VELUX solar water heating
systems are available for integration into either shingle or tile roofs or for rack mounting. VELUX solar water heating system
model numbers CLI U12 SDOL 118, CLI U12 SK0L 218, CLI U12 SK0L 318, CLI U12 SD0L 119, CLI U12 SK0L 219, and CLI U12 SK0L 319,
are systems that include “L” step fl ashings for integration into shingle roofs. VELUX solar water heating system models
CLI U12 SD0W 118 , CLI U12 SK0W 218, CLI U12 SK0W 318, CLI U12 SD0W 119 ,CLI U12 SK0W 219, and CLI U12 SK0W 319 are
Part 2: General information
