Cascade Drainback Cascade Drainback
TM
Cascade Drainback
SRCC OG-300 Certified Solar Water Heating System
Installation, Operation & Maintenance Manual
CASCADE DRAINBACK™
DOMESTIC SOLAR WATER
HEATING SYSTEM
INSTALLATION, OPERATION AND
MAINTENANCE MANUAL
The Cascade Drainback™ solar water heating system has gone through an extensive design, technical
and performance review by the Solar Rating & Certification Corporation (SRCC). The installation of your
Cascade Drainback™ system is intended to be executed by properly licensed and experienced professional contractors in accordance with SRCC Standard OG-300, "Operating Guidelines and Minimum
Standards For Certifying", and must conform to applicable federal, state and local regulations, codes,
ordinances and standards governing the installation of solar water heating systems.
The solar energy system described by this manual, when properly installed and maintained, meets the
minimum standards established by the SRCC. This certification does not imply endorsement or warranty of this product by the SRCC.
OG-300 system certification is granted to SunEarth by the SRCC. It may not be used for any commercial purpose without the prior written consent of SunEarth. SunEarth must approve any deviation from
the specified materials and methods described in this manual in writing.
The Cascade Drainback solar water heating system may not be installed in areas within the
continental United States where the annual ambient temperature has ever fallen below minus
50° Fahrenheit (-46° Celsius). The Cascade Drainback™ system must be installed as specified in
this manual to have effective freeze protection at these low temperatures.
Freeze tolerance limits are based upon an assumed set of environmental conditions. Extended periods
of cold weather, including ambient air temperatures above the specified limit, may cause freezing in
exposed parts of the system. It is the owner’s responsibility to protect the system in accordance with
SunEarth’s instructions if the ambient air temperature approaches the specified freeze tolerance limit.
TABLE OF CONTENTS
Preface
1) Introduction ...................................................................................................................1
2) System Description and Operational Principle ...........................................................1
3) Installation Requirements – General............................................................................3
4) Installation Requirements – Specific ............................................................................3
5) System Start Up Procedures .......................................................................................12
6) Two Modes of System Operation ..............................................................................13
7) Isolating The Major Components and Shut Down Procedures................................13
8) Summer Vacation Procedures .....................................................................................14
9) Maintenance and Troubleshooting ............................................................................14
10) Primary System Component Parts............................................................................15
11) Estimated Component Life Expectancy ...................................................................16
12) Cascade Drainback System Model Numbers ...........................................................16
13) SunEarth CopperStor Drainback Tank and Empire Series Collector Specifications ...17
14) A Note on Component Warranties ..........................................................................20
15) SunEarth Warranty Statement .................................................................................21
16) Return Warranty Card ...............................................................................................23
PREFACE
Let us first offer two words of grateful appreciation. Thank You! We sincerely appreciate your
business. SunEarth also wishes to say thank you
for "going solar". Solar water heating systems
reduce our nation’s dependence on polluting fossil fuels, minimize the greenhouse gas emissions
associated with conventional water heating and,
very importantly, lower your monthly utility costs.
Established in 1978, SunEarth is a leading U.S.
solar equipment manufacturer. Our products
include industry standard Imperial™ Empire™
and SunWise™ solar water heating collectors,
CopperHeart™ integral collector storage systems, SunSiphon™ packaged thermosiphon systems, SunBurst™ all copper absorber plates,
Solar Strut™ residential mounting hardware and
"RexRack"™ commercial mounting systems. We
also build specialty collectors for unique architectural and building applications. SunEarth Solar
Rating and Certification Corporation (SRCC)
Standard OG-300 certified solar water heating
systems are sold by leading solar, plumbing and
building contractors throughout the United
States.
Your Cascade Drainback solar water heating system has been designed to meet exacting SRCC
OG-300 certification requirements. The specific
components found in your system have been
selected by your installation contractor for their
proven reliability, longevity and performance in
your specific region of the country.
1) INTRODUCTION
Solar water heating systems are climate and site
specific appliances. Different types of solar systems are installed around the world in accordance with regional weather and water quality
conditions. System performance varies as a function of the daily household hot water load,
including all showers, laundry, and kitchen uses,
the average annual ground water and ambient
air temperatures, the home’s roof pitch and orientation, and, of course, the seasonal intensity of
solar energy. These variables, some of which
change from home to home on the same neighborhood street, determine how much energy and
money your Cascade Drainback system will save
on an annual basis.
CASCADE DRAINBACK
Your Cascade Drainback solar system is known as
a "forced circulation closed loop drainback" system because it utilizes a mechanical pump to efficiently circulate water throughout the unpressurized closed loop solar piping. The "drainback"
connotation refers to the freeze-protection
mechanism used in the system. In drainback systems, the heat exchange fluid (water) in the collector array and solar loop piping drains back by
gravity into the CopperStor storage reservoir
when the pump stops circulating. Air replaces
water in the collector array and solar loop piping
to prevent it from freezing when the pump is off.
This manual is intended as a basic "solar water
heating primer". Our goal is to familiarize you
with the proper installation, operation, and maintenance of your Cascade Drainback solar system.
This system is required to be installed by properly licensed solar or plumbing contractors in accordance with SRCC Standard OG-300 and all applicable national, state and local codes, ordinances
and regulations governing solar installations as
well as good trade practices. Failure to follow the
procedures and practices described in this manual can void manufacturer warranties for specific
component parts.
This manual covers systems utilizing either one or
two SunEarth solar collectors. The collectors may
heat a single solar storage tank or a solar storage
tank and an auxiliary electric or gas water heater.
For simplicity, the singular form will be used
throughout this manual when referring to the
system components and permutations. Frequent
reference will be made throughout this manual
to specific component parts. The placement of
each component in the system is found in Figures
13 and 14, pages 9 and 10. An explanation of
the component function is found in Section 10,
page 15.
2) SYSTEM DESCRIPTION AND OPERATIONAL
PRINCIPLE
The key components in the Cascade Drainback
solar water heating system include the SunEarth
solar collector, CopperStor drainback reservoir,
solar storage tank with integral heat exchanger,
circulation pump, differential thermostat and
mixing valve.
The SunEarth solar collector is the heart of the
Cascade Drainback system. Simply stated, when
P.1
the sun is shining, heat energy is absorbed by the
solar collector’s all copper absorber plate and
transferred to the water circulating through the
solar collector. The system pump efficiently circulates this heated water through the collector piping and integral tank heat exchanger. The heat
exchanger consists of a 120’ length of copper
tubing wrapped around the solar storage tank.
As the water passes through the heat exchanger,
the heat in the fluid is transferred to the potable
water in your solar storage tank. As this process
is repeated during the average sunny day, the
temperature in your solar storage tank rises.
The circulating pump in a solar water heating system may be favorably compared with the human
heart. To continue the analogy, the differential
thermostat, or control, is the brain in the system.
The control uses two 10K ohm thermistors, or
sensors, to constantly monitor the temperature
difference between the hottest and coldest
points in the system and to automatically turn
the circulating pump on and off as appropriate
throughout the day.
When the solar collector absorber plate is twenty degrees hotter than the temperature in the
bottom of your solar storage tank, the controller
will turn the circulating pump on. When the temperature difference has been reduced to four
degrees, the control automatically turns the
pump off.
Depending upon the system demand, time of
year and the weather, the circulating pump may
either run intermittently throughout the day or
constantly for hours at a time.
Both single and double tank Cascade Drainback
systems are designed to accommodate two separate modes of system operation. Your system
can either (1) serve as a preheater to your conventional electric or gas water heater or (2) be
bypassed entirely and run 100% on utility power
during inclement weather or when maintenance
is required. Section Six provides instruction in
setting the system for automatic operation in
each of these two modes.
The water in the SunEarth collector and the solar
loop piping automatically drains back into the
CopperStor reservoir each time the circulating
pump turns off. Gravity drains the piping and
provides the freeze protection for your Cascade
Drainback system.
To ensure proper drainage the SunEarth
solar collector must be installed in the vertical position so that the internal riser tubes
run parallel, not perpendicular, to the plane
of the roof.
fig. 1
SYSTEM ORIENTATION
P.2
CASCADE DRAINBACK
The system also can be manually drained in order
to protect the integrity of the collector and solar
loop piping if it is exposed to extended periods of
disuse or persistent hard freeze conditions below
- 50° Fahrenheit. See Section 7, page 13 for
instructions.
3) INSTALLATION REQUIREMENTS – GENERAL
3.1 The contractor shall obtain all required permits and approvals.
3.2 The installation shall conform to all federal,
state, and local regulations, codes, ordinances,
and standards governing the installation of solar
water heating systems. The contractor shall
adhere to sound building safety and trade practices. Special consideration must be given to
building code requirements for the penetration
of structural members and fire rated assemblies.
3.3 The solar collector must be located in a
structurally sound area of the roof that will be
unshaded for the majority of the day all year
round. Adjacent buildings and trees should be
checked for possible shading. An instrument
such as the Solar Pathfinder can be used for site
analysis. See http://www.solarpathfinder.com
3.4 Before installation the contractor shall
inspect the condition of the roof and notify the
homeowner of any existing roof damage or necessary repairs.
3.5 The homeowner and contractor shall confirm the location of all roof and ground mounted
components in advance of the installation.
4) INSTALLATION REQUIREMENTS – SPECIFIC
4.1 Collector Orientation
The performance of solar water heating systems
in the Northern Hemisphere is optimized when
the collector is mounted facing True South.
Performance, however, suffers very little when
the collector is oriented no more than 45° East or
West of True South.
If your collector must be oriented East of 135° of
True or West of 225° of True, you should consider either adding collector area, i.e. using more or
larger collectors, or specifying SunEarth’s high
performance black chrome absorber plates.
(Empire models EC or Imperial models IC)
CASCADE DRAINBACK
The collector should be unshaded by any permanent obstacle from 9:00 a.m. to 3:00 p.m. every
day of the year.
4.2 Collector Tilt
Optimal annual efficiency is achieved by tilting
the solar collector at an angle that equals your
latitude plus an additional 10 degrees. This tilt
angle favors the lower winter sun when collector
performance is at its lowest and minimizes overheating during the hottest summer months.
The minimum acceptable tilt angle from horizontal is 25°.
4.3 Basic Mounting Procedures
The SunEarth solar collector in your Cascade
Drainback solar system must be mounted in a
vertical orientation parallel to the slope of the
roof. See Figure 1, page 2. This orientation
allows the internal riser tubes to rapidly drain
when the circulation pump shuts off. Both the
collectors and the solar loop piping must be
sloped to drain back to the CopperStor
reservoir. The minimum required slope is
1/4" per foot of horizontal piping run. Use
the steepest slope possible on the return
line piping to the CopperStor reservoir.
The collector should be mounted as close to the
storage tank as possible to minimize heat loss in
the piping runs. If the home has attic access,
mounting the collectors near the roof peak provides for additional attic workspace. The solar
collector should be mounted on the roof in
accordance with these general principles:
4.3.1 The most important structural consideration is to securely anchor the solar collector and
the "Solar Strut"mounting hardware to the
structural members of the roof (i.e. rafters) with
stainless steel hanger or lag bolts. The solar collector must be attached to the mounting hardware as detailed in Figures 2 - 8.
4.3.2 The collector must be raised from the roof
surface to allow for rainwater and debris to pass
under the collectors and for proper ventilation of
the roofing material. Provide no less than 1" of
clearance between the roof surface and the bottom of the solar collectors.
P.3
fig. 3
fig.2
SHINGLE ROOF MOUNTING DETAIL
fig.4
COMPOSITION SHINGLE MOUNTING DETAIL
fig.5
TILE ROOF MOUNTING DETAIL
TILE ROOF MOUNTING DETAIL
4.3.3 In selecting mounting hardware and fasteners it is extremely important to avoid galvanic
corrosion resulting from the direct contact of
incompatible metals. Use SunEarth anodized
aluminum "Solar Strut" mounting hardware and
stainless steel lag or hanger bolts, lock washers
and round washers. In climates subject to severe
winters or high humidity the use of galvanized
fasteners is prohibited.
P.4
4.3.4 The most important roofing consideration
is to preserve the integrity of the water proof roof
membrane. Ensure that all roof penetrations
required to plumb and mount the solar collector
are properly flashed and sealed in accordance
with standard roofing practices. A urethane caulk
such as Sikaflex 1a is recommended for sealing
roof penetrations. Tremco "POLYroof" elastomer coating is also acceptable. Silicones and
roofing tars tend to dry out over time and
become susceptible to cracking.
CASCADE DRAINBACK
fig. 7
fig.6
FLUSH MOUNTING DETAIL
TILT MOUNT DETAIL
4.4 Solar Loop Pipe Insulation
fig.8
The solar loop piping must be well insulated with
a high quality flexible closed cell insulation to minimize heat loss. The wall thickness of the pipe
insulation should not be less than 3/4". One inch
(1") is recommended. When it comes to pipe
insulation the rule is simple: thicker is better. The
specified insulation material is Rubatex Insul-Tube
180 or equal.
To the extent possible, slide the insulation material over the pipe without cutting or taping. All butt
joints must be sealed with contact adhesive. The
use of rigid polyethylene pipe insulation is prohibited. The temperatures generated by your collector in the summer months or under stagnation
conditions can melt this type of material.
TILT MOUNT STANDOFF DETAIL
4.3.5 If the region is subject to hurricane conditions, additional steps may be required to secure
the collector and mounting hardware to the
structural members. In certain areas of the country, local building codes may require collector
wind load testing or prescribe specific mounting
procedures. Consult your local building department.
CASCADE DRAINBACK
Any above ground exterior pipe insulation is subject to UV degradation and must be wrapped
with foil tape or painted with two coats of high
quality water-based acrylic resin coating as supplied by the insulation manufacturer. Rubatex UV
Protective Coating or equal is the required coating
material.
P.5
4.5 Collector Plumbing
fig.9
SunEarth requires the use of all copper and brass
fittings in the collector and solar loop plumbing.
Couplings or brass unions should be used to join
the collectors in a two panel system. Use only
lead-free solder. Engelhard Silvabrite 100 or
equal is required. Use of 50/50 lead solder is
expressly prohibited. Use of galvanized steel,
CPVC, PVC, or any other type of plastic pipe is
prohibited.
To ensure proper drainage of the collector array
and solar loop piping the lines must be adequately sloped to drain back to the CopperStor
reservoir. The required slope is 1/4" per foot
of horizontal run. Failure to properly orient
the collector and solar loop piping to allow
for adequate drainage may result in freeze
damage. The SunEarth solar collector in not
warranted against freeze damage.
The solar loop piping from the collector
array must no less than 3/4" T-M copper piping to prevent air locks in the array and to
ensure proper drainage.
Figure 10 illustrates correct and incorrect methods of plumbing the solar collector array. Note
that water will trap in the "U" section of piping
as illustrated in the drawing marked incorrect
thus making it susceptible to freeze damage.
All vertical piping between the storage tank and
the collector shall be supported at maximum
intervals of ten feet (10’). All other piping should
be supported every five feet (5) to prevent sagging. Copper plumbers tape or tube strap is
required. The pipe insulation may not be compressed or crimped by the strapping material.
COLLECTOR PLUMBING
The installation of all horizontal and vertical piping may not reduce the performance or rating of
any structural member or fire rated assembly.
Adhere to all applicable local codes and ordinances.
4.6 Collector Sensor Placement
The collector sensor must be located on the hot
water return line as close to the collector as possible. Sensors are typically accurate to +/- 1/2° F if
properly installed and weatherized. To maximize
sensor accuracy, attach the flanged portion of the
sensor to the SunEarth collector header pipe with
a stainless steel hose clamp. Wire nuts used to
connect the sensor and low voltage wiring shall
be all plastic, sealed with silicone and thoroughly
wrapped in electrician’s tape. The copper sensor
head must be placed under the rubber pipe insulation covering the collector header. Thoroughly
wrap and weatherize the insulation with electrician’s tape or insulation tape as provided by the
manufacturer (Rubatex Insul-Tape or equal). See
Figure 11 for collector sensor installation detail.
fig.10
P.6
CASCADE DRAINBACK
Table 1. Pipe run lengths for 1/2" supply and
3/4" return line.
fig.11
COLLECTOR SENSOR PLACEMENT
4.7 Low Voltage Wiring
The low voltage wiring used to connect the sensors to the controller should be a minimum18
AWG. The wiring should be bare or tinned copper, two conductor, PVC insulated, with a PVC
UV rated gray jacket suitable for exterior use. Use
Eastman Wire & Cable No. 5704, Belden Wire
and Cable No. 8461 or equal.
4.8 Choosing and Installing the CopperStor
Drainback Reservoir
SunEarth manufactures three different sized
drainback tanks. Select the appropriate tank
based on the collector(s) chosen and the total
length of solar supply and return loop piping in
the system. Table 1 and Table 2 indicate the
proper drainback tank for the two most common
piping scenarios. Our preference is to use Table 1,
1/2” piping for the supply line and 3/4” piping
for the return line.
This provides some flow
related benefits, extends the allowable pipe run
and is slightly less expensive.
The CopperStor drainback reservoir is designed
to be wall mounted in a conditioned space
using a SunEarth CopperStor wall mount bracket. It also may be supported by hooks screwed
into wall joists or with masonry bolts if installed
on a basement wall. The outlet of the
CopperStor drainback tank should be at least
48" above the suction side of the circulating
pump (See Figures 13 and 14). The solar loop
return fitting on the Ruud/Rheem heat exchange
tank is 30" from the bottom of the tank. In an
ideal installation the Copperstor outlet piping will
be at least 18" above the tank fitting.
CASCADE DRAINBACK
Array
DB 5.0
DB 7.5
DB 10.0
1 EP/EC-40
82
138
194
2 EP/EC-21
76
132
188
2 EP/EC-32
73
129
185
2 EP/EC-32
62
118
174
Table 2. Pipe run lengths for 3/4" supply and
return lines.
Array
DB 5.0
DB 7.5
DB 10.0
1 EP/EC-40
61
103
144
2 EP/EC-21
57
98
140
2 EP/EC-32
54
96
138
2 EP/EC-32
46
88
130
The CopperStor reservoir is factory insulated to
provide both heat retention and a noise buffer
against the sound of falling water.
If your Cascade Drainback system includes a
flowmeter it should be plumbed so that the top
of the flowmeter is level with the top of the
tubes in the CopperStor unit. The top and bottom of the flowmeter should be supported to
relieve stresses on the connecting unions. Use a
Blue White model F-450LHB flowmeter or equal.
DO NOT install the pressure relief valve (PRV) on
the CopperStor reservoir at this time. The PRV is
threaded in place after the solar loop piping has
been filled with water. See Section 4.13 for
instructions on charging the system.
4.9 Installing the Solar Storage Tank and
Ancillary Components
When plumbing the Ruud/Rheem solar storage
tank and Copperstor drainback reservoir make
sure that all the components are accessible and
easy to reach. Ensure that there is clear access to
the storage tank, circulating pump, CopperStor
drainback reservoir, mixing valve, flowmeter and
other key components. If a component in the
potable water side of the system may require
future service or maintenance make the connections with brass unions. Use only brass nipples
P.7
and unions and copper and brass fittings in
plumbing the solar storage tank and expansion
tank. The use of galvanized fittings or nipples,
CPVC, PVC or other plastic pipe is prohibited.
In two tank installations the isolation ball valves
BV2, BV3 and BV4 must be plumbed in the proper orientation. Plumb BV3 and BV4 in a vertical
orientation above the solar storage tank. BV2
must be plumbed horizontally with the valve
handle on the side and not the top of the valve.
Hard copper connections to the city cold water
supply line and the home hot water feed lines are
recommended. The gaskets in standard water
heater flex hose connectors can become brittle
and compressed over time and begin leaking on
the water heater. If not detected in a timely
manner even a small drip or leak may cause serious damage to the tank’s electrical components
or, in extreme cases, may cause the tank to leak
from the outside in.
Tank plumbing is required to provide for the isolation of the solar storage tank from the city cold
water supply line by means of an isolating ball
valve (BV1).
Line thermometers shall be installed in the collector supply and return lines to allow for a simple diagnostic check of proper system operation.
The differential temperature between the two
thermometers will be anywhere between 5°- 20°
during the course of a sunny day. Compare the
temperature readings in the two line thermometers (T1 and T2).
In both single and double tank systems install a
third thermometer (T3) on the hot water outlet
above the solar storage tank.
mometer above the solar storage tank.
A pump throttling valve (BV5) must be located on
the discharge, or upstream, side of the pump to
adjust the solar loop flow rate and to prevent
cavitation of the circulating pump. Cavitation is
a fluid condition that can lead to pitting or other
damage to the pump impeller.
A brass boiler drain (BD) must be installed at the
lowest point in the system to allow for charging
the solar loop piping and to serve as a drain valve
for manual draining and maintenance.
A high quality thermostatic mixing valve is
required in all OG-300 certified systems and
should be plumbed in line with brass union connections for ease of future repair or replacement
(MX). The specified mixing valve shall be the
Cash Acme model HGB 12 or equal and shall
have an operating range between 95° F and
120° F.
WARNING: SCALDING CAN OCCUR WITHIN
FIVE SECONDS WHEN WATER TEMPERATURES APPROACH 140° F. DESPITE THE
INSTALLATION OF A MIXING VALVE IN YOUR
CASCADE DRAINBACK SYSTEM, ALWAYS
EXERCISE CAUTION WHEN OPENING A HOT
WATER FIXTURE OR FAUCT IN YOUR HOME.
The 3/4" cold water supply line to the solar storage tank must be insulated with minimum 7/8"
X 3/4" pipe insulation to a minimum distance of
5’ behind the storage tank, or to the wall if closer than 5’.
fig.12
The Cascade Drainback system requires a high
head, low flow circulating pump. SunEarth recommends the Taco model OO9. The Grundfos
UP26-96BF is the next best choice for this application.
TANK SENSOR PLACEMENT
The specified controller, the Goldline GL-30-LCO,
may be equipped with an optional snap-in digital
temperature display module. The Goldline TD-GL
module can continuously display the solar tank or
back-up water heater temperature readings as
well as the SunEarth collector temperature. If a
Goldline TD-GL digital display module is added to
the system there is no need to install a ther-
The Ruud/Rheem solar storage tank with integral
heat exchanger and auxiliary heating element,
model no. RSPEHE-1 or 81V80HE-1, is the specified storage tank in your Cascade Drainback system.
P.8
CASCADE DRAINBACK
fig.13
SINGLE TANK SYSTEM SCHEMATIC
Figures 13 and 14 detail the plumbing schematics for single and two tank Cascade Drainback
systems. A brief explanation of the main components and their function is found in Section 10
below.
4.10 Tank Sensor Placement
Figure 12 shows the proper placement of the
solar storage tank sensor. Make sure the sensor is
secured to the threaded stud on the storage tank
with a 10-24 stainless steel nut.
CASCADE DRAINBACK
Thoroughly weatherize the wire connections in
accordance with the roof sensor detail as
described above. Replace the fiberglass insulation
batting and close the access cover.
4.11 Tank Insulation
SunEarth requires that the solar storage tank
must have a minimum insulation value of R- 20.
Most solar storage tanks now come with R-16.7
factory insulation. Conventional back-up electric water heaters have insulation values
P.9
between R-12 and R-20. The R value expresses
the thermal conductivity of the insulation material. The higher the "R"value the more effective
the insulation material is at preventing heat loss.
Whereas solar storage tanks do not come with
sufficient factory insulation to meet SunEarth’s
insulation specification, a supplemental insulation jacket also must be installed. We recommend an aluminum foil "bubble-pack" insulation material such as manufactured by Reflectix
(or equal). When properly applied, the insulation jacket will increase the overall level of tank
insulation to R-22.
In two tank retrofit installations an insulation
jacket also must be installed on the back-up
water heater. If your Cascade Drainback system is
installed in a new home, SunEarth specifies that
the conventional water heater in a two tank system have an insulation value of R-20 (Rheem
82VR52-2, Ruud EVR52-2 or equal.
For best results, cut three 1" strips of material and
affix these to the top, middle and bottom of your
water heater or storage tank with the manufacturer’s tape. This space creates an air gap between
the heater and the insulation and prevents heat
conduction. Wrap the material around the water
heater or storage tank and secure the seams with
the manufacturer’s tape. Make sure to fully insulate the top of the heater. Cut around the nipples
and relief valve to ensure a tight custom fit.
fig.14
PLUMBING COMPONENT DIAGRAM
P.10
CASCADE DRAINBACK
ELECTRICAL COMPONENTS
fig.15
The storage tank should not be placed directly on
an uninsulated floor or concrete slab. The tank
should be placed on a well insulated pad with a
minimum R-value of 10. A 2" rigid polystyrene
insulation pad such as manufactured by Frost
King (or equal) is recommended.
4.12 Electrical Requirements
A properly licensed contractor must make the
230 volt electrical connection to the water heater
or solar storage tank and the optional electronic
time switch. If your solar contractor is not
allowed by law to make these connections consult a licensed electrician.
CASCADE DRAINBACK
Never activate the circuit breaker controlling the
electrical heating element until the solar storage
tank is completely filled with water. This will prevent "dry firing" of the heating element. The
electrical heating element will be destroyed
almost instantaneously if not completely submerged in water when activated. Make sure the
water heater circuit breaker is off until the solar
storage tank is completely filled.
SunEarth specifies the use of the Goldline
Controls model GL-30-LCO differential thermostat with a factory installed six foot line cord.
One 115 volt outlet must be located near the
solar storage tank. Plug the Goldline Control
P.11
into the outlet. The Taco circulation pump, also
wired, is plugged directly into the 115 volt receptacle located on the side of the Goldline control.
A 230 volt hard-wired control and circulation
pump may be substituted, but troubleshooting
the components in the future becomes more difficult.
Goldline Controls also manufactures a very useful
snap-in digital meter that works in conjunction
with the GL-30-LCO control. The Goldline TD-GL
digital monitor is a good diagnostic tool and is a
recommended system option.
4.13
Charging the System
Once the components have been plumbed it is
time to fill the solar storage tank with water.
Proceed as follows:
4.13.1 Begin by opening the cold water isolation
ball valve to the solar tank (BV1). Allow trapped
air to escape by opening a hot water tap in the
house. After the tank is filled, inspect all threaded fittings and solder joints for leaks.
4.13.2 Fill the solar loop piping with water.
Begin by connecting a washing machine hose to
the boiler drain (BD) located at the lowest point
in the system.
4.13.3 Open the boiler drain (BD) and begin filling the system directly from a tap or by using a
utility pump. If your system has a flowmeter (FM)
continue filling the solar loop piping until the
water level is visible in the flowmeter. When the
water rises to within 1" of the top of the
flowmeter, close the boiler drain (BD). Install the
mandatory pressure relief valve (PRV) on top of
the CopperStor reservoir.
4.13.4 If your system does not have a flowmeter
attach a washing machine hose to the female fitting on top of the CopperStor reservoir using an
appropriate hose to pipe fitting (3/4"Male Hose
Thread X 3/4" FIP). Place the other end of the
hose in a basin drain or mid-size bucket. Open
the lower boiler drain (BD) and begin filling the
solar loop piping from a tap or by using a utility
pump. Continue filling the piping until water
flows from the upper hose into the basin or storage bucket. Close the boiler drain and install the
PRV on the drainback reservoir.
P.12
4.13.5 At this point it is recommended to run
water through the system to remove any solder
flux residue or other impurities that were introduced into the system during plumbing. Proceed
by removing the cover from the -Goldline GL-30LCO control and slide the System Test Switch
to‘ON’. Allow the pump to circulate water
through the system for 15-20 minutes. Turn the
controller back to the ‘OFF’ position.
4.13.5 Drain the cycled water out of the array by
placing the hose attached to the lower boiler
drain (BD) into a service drain or bucket. Open
the lower boiler drain and completely drain the
water from the system. CAUTION: THIS
WATER MAY BE EXTREMELY HOT!
4.13.6 Refill the system with water as outlined in
sections 4.12.2 and 4.12.3, or in 4.12.4
5) SYSTEM START-UP PROCEDURES
Throughout the installation procedures outlined
in Section 4, emphasis has been placed on the
proper plumbing and wiring of the primary system components. The solder and threaded connections also have been visually inspected for
leaks and the solar loop piping has been cleaned
and charged. Having successfully completed
these tasks it is time to set your system to run
automatically.
Remove the cover of the Goldline control and set
the switch to the ‘ON’ position. Wait until you
can hear water flowing through the solar loop
return piping from the collector. For systems that
include a flowmeter (FM), adjust the flow setting
valve (BV5) until the meter indicates that the
flowrate through your SunEarth collector(s) conforms to the specified GPM found in Table 3.
For systems without a flowmeter, place your ear
next to the pump and listen for signs of cavitation. Cavitation sounds like sand running
through the pump and is caused by the implosion of small air bubbles hitting the pump
impeller. Cavitation can dramatically reduce the
life of the pump and the flow setting valve (BV5)
should be used to eliminate this condition. If you
hear cavitation when the valve is wide open,
slowly close the valve until the sound is gone.
CASCADE DRAINBACK
TABLE 3
the Goldline control and slide the System Test
Switch from ‘AUTO’ to ‘OFF’. Replace the control cover.
Collector Array
Flowrate (GPM)
1 EP/EC-40
1.0
Two Tank System Instructions:
2 EP/EC-21
1.1
2 EP/EC-24
1.2
2 EP/EC-32
1.7
6.3 Solar Preheat: Follow the instructions for the
single tank system for setting the thermostat and
the heating element for automatic operation
Isolation ball valves (BV2, BV3, and BV4) should
be positioned with their handles in a vertical orientation. Valve BV2 will be closed and valves BV3
and BV4 will be open.
5.2 Now locate the Goldline control red rotary
switch labeled ‘TURN ON’ and set it to 20°. This
setting controls the required temperature difference between the collector and storage tank
before the circulating pump will turn on. The
‘OFF’ differential is factory preset at 4° F. Next
locate the red rotary switch labeled ‘HI LIMIT’ and
set it to 150° F. This setting will limit the finished
tank temperature and prevent system overheating.
5.2.1 Activate the Goldline control by sliding the
System Test Switch to the ‘AUTO’ position.
Replace and secure the plastic cover. Your system is now set to run automatically whenever
solar energy can be collected.
6) TWO MODES OF SYSTEM OPERATION
Both single and double tank Cascade Drainback
systems are designed to accommodate two separate modes of operation. Your system can either
(1) serve as a preheater to your conventional
electric or gas water heater or (2) be bypassed
entirely and run 100% on utility power during
inclement weather or when maintenance is
required.
Single Tank Operating Instructions:
6.1 Solar Preheat: Leave the circuit breaker on to
your solar storage tank and set the tank thermostat to the lowest acceptable temperature setting. The electric resistance heating element will
come on only when the tank temperature falls
below the thermostatic set point. If the solar
heated water entering the tank is warmer than
the thermostatic set point, the electric heating
element will not come on. If you have a water
heater timer, you may preset the timer to turn
the heating element on and off at specified times
throughout the day if desired.
6.2 100% Utility Power: Leave the circuit breaker on to your solar storage tank and turn off the
circulation pump. Remove the plastic cover from
CASCADE DRAINBACK
6.4 100% Utility Power: Follow the instructions
for the single tank system above. Isolation valves
(BV2, BV3, and BV4) should be positioned with
their handles in a horizontal orientation. Valve
BV2 will be open and valves BV3 and BV4 will be
closed.
These instructions are predicted on plumbing the
isolation ball valves BV3 and BV4 in a vertical orientation above the solar storage tank. BV2 must
be plumbed in the horizontal orientation with
the valve handle on the side and not the top of
the valve.
7) ISOLATING THE MAJOR COMPONENTS
AND SYSTEM SHUT DOWN PROCEDURES
Your Cascade Drainback solar water heating system is designed so that the key components can
be easily isolated for emergency repairs or routine maintenance. By shutting a single valve you
can isolate the entire system from the pressurized
cold water supply line (BV1). In the case of a
storage tank or fitting leak immediately shut this
valve and call your installation contractor for
service.
The collector loop can be quickly drained if a leak
is detected or for routine maintenance. Slide the
Goldline control System Test Swtich to the ‘OFF’
position. Next, attach a hose to the lower boiler
drain (BD) and open the valve to drain the system. CAUTION: THIS WATER MAY BE
EXTREMELY HOT!
In two tank systems the solar storage tank can be
isolated from the back-up water heater. Set the
valve handles to the 100% utility power configuration as outlined above. By closing these valves
the tank can be serviced or replaced. The operation of the back-up water heater will not be
affected.
P.13
8) SUMMER VACATION RECOMMENDATIONS
AND PROCEDURES
Solar water heating systems can build up very
high temperatures during summer months if
there is no daily draw on the system. If a short
summer vacation is planned the best way to
avoid overheating in a drainback system is to set
the Goldline control System Test Switch to the
‘OFF’ position. The pump will not circulate during the day and the system will not "gain" any
additional heat.
For extended vacations of a month or more
SunEarth recommends that you cover the panels
with a suitable opaque material. Stagnation conditions can have an adverse effect on the internal
collector piping if the panel is left unprotected.
SunEarth’s collector warranty specifically excludes
stagnation conditions in excess of sixty days.
Remember to reset the Goldline control to the
‘AUTO’ position upon your return.
9) MAINTENANCE AND TROUBLESHOOTING
The following simple procedures are intended to
optimize the performance of your Cascade
Drainback solar water heating system and also to
extend the life of the primary components.
9.1 It is important that the CopperStor reservoir
remain full for proper system operation. To check
the fluid level, slide the Goldline System Text
Switch to the ‘OFF’ position and allow the fluid
in the array to drain into the CopperStor reservoir. For systems installed with an optional
flowmeter, check to see that the fluid is not less
than 1" from the top of the meter. If your system does not have a flowmeter, unscrew the
pressure relief valve (PRV) and dip a wooden
dowel into the threaded copper fitting to check
that the fluid level is not more than 6-8" below
the valve fitting. If a small amount of fluid is
needed to bring the reservoir up to the proper
level, pour it directly into the PRV fitting port.
Rewrap the male thread on the PRV with Teflon
tape and reinstall. You may also follow the
instructions in sections 4.12.2 and 4.12.3 or
4.12.4 for charging the system if more water is
required.
Please remember that over time you WILL lose
some fluid in the solar loop piping. If the water
level is not properly maintained you may
P.14
do irreparable damage to your circulating
pump. Check you fluid levels at least once
a year.
9.2 The second most important component in
your system, at least from a longevity standpoint,
is often ignored and never seen. We are referring
to the sacrificial "anode rod" installed in your
solar storage tank (ST1). Typically constructed
from magnesium, anode rods are installed in
"glass lined" water heaters and storage tanks to
inhibit corrosion.
As the name implies, the "sacrificial" anode rod
is consumed so that the tank lining is not. At a
certain point in the process, the anode rod is no
longer completely effective and the corrosive
processes begin to eat away at the tank’s glass
lining. In time the solar storage tank, like any
other gas or electric water heater, will begin to
leak. The process is not reversible and the tank
must be replaced.
System temperatures and water quality affect the
rate at which the anode rod is consumed. In general, the higher the average system temperature
the faster the rate of corrosion. By changing the
anode rod after the fifth year of system operation, and every three to five years thereafter, it is
possible to extend the life of the solar storage
tank. Periodic replacement of the anode rod in
your solar storage tank can significantly extend
the tank life.
9.3
The solar storage tank also should be
flushed annually to minimize sediment buildup
on the bottom of the tank. If you live in an area
with high mineral content in your water, flush the
tank on a semi-annual basis. Disconnect the
power to the solar tank at the circuit breaker or
time switch (if present) before flushing. Turn the
Goldline control System Text Switch to the ‘OFF’
position. In a two tank system it is not necessary
to disconnect the power to the electric water
heater in order to flush the solar tank.
Open the flush valve on the bottom of the storage tank and drain a sufficient volume of water
to eliminate the sediment. After the procedure is
complete make sure the tank is completely full of
water before restoring power to the thermostat
and heating element. Turn Goldline control
System Text Switch to the ‘ON’ position.
CASCADE DRAINBACK
9.4 If you live in a dusty climate it is beneficial to
wash off the dirt that settles on the collector glass
once a month. Clean glass allows the collector to
maintain a high level of thermal performance.
9.5 Check the exterior pipe insulation annually
and patch or repair any exposed surfaces or
degraded areas. Repaint as necessary.
9.6 In the unusual instance of collector glass
breakage, the glass should be replaced immediately. Do not allow moisture or debris to enter
the collector casing. Contact your installation
contractor to change the glass.
9.7 If you detect a water leak in the solar loop
piping or tank plumbing, contact your installation contractor for service.
9.8 If you do not have hot water on a sunny day
check to see that the controller is set in the
‘AUTO’ position. If the pump won’t run unplug it
from the controller receptacle and plug it directly
into a nearby 115 volt outlet. If the pump still
does not run it may need to be replaced. If the
pump does run when plugged into the wall outlet then the problem is likely located in the control or one of the two 10K ohm sensors. Contact
your installation contractor for service.
9.9 If you have a full tank of hot water before
bed and the solar storage tank is cold in the
morning it is likely that either a sensor or the
Goldline control has failed. Make sure that the
circulating pump is not running after 6:00 p.m. If
the pump is running and the control indictor light
"Solar" #1 is on after 6:00 p.m., check both sensors to see that they calibrate to 10K ohm resistance at 77° F. If you find a defective sensor
replace it immediately. If the sensors are properly
calibrated contact your installation contractor to
check the Goldline control.
Please note that in a two tank system nighttime
heat loss will be harder to detect, especially if you
are operating in the solar preheat mode. If the
circulating pump is operating after 6:00 p.m. the
water going up to the collectors will be hotter
than the water returning to the solar storage
tank. Follow the procedures in 9.9 above.
9.10 If the weather is poor and the auxiliary
heating element will not fire, the reset button on
the storage tank thermostat may have to be
depressed to be reset. NEVER REMOVE THE
CASCADE DRAINBACK
ACCESS PLATE ON THE EXTERIOR OF THE
SOLAR STORAGE TANK OR CONVENTIONAL
ELECTRIC WATER HEATER WITHOUT FIRST
DISCONNECTING THE 230 VOLT POWER SUPPLY AT THE CIRCUIT BREAKER.
If the red reset button on the thermostat clicks
when depressed the heating element should
immediately fire when you reconnect the circuit
breaker. It you still do not have hot water after
one hour contact your installation contractor for
service. (In two tank systems the conventional
electric water heater will be wired for electrical
backup. The solar tank will serve solely as a storage tank).
10) SOLARAY SYSTEM COMPONENT PARTS
See Figures 13 and 14 for the location of the specific component numbered below.
SunEarth Solar Collector(s): Absorbs the sun’s
heat energy and transfers this heat to the heat
exchange fluid (water) circulating through the
collector.
Collector Sensor (S1): Wired to the Goldline
control. Works in conjunction with the tank sensor to automatically turn your circulating pump
on and off at preset temperature differentials.
Line and Tank Thermometers (T1, T2, T3):
Used to determine proper system operation. Line
thermometers display the differential temperature between the collector supply and return
lines on sunny days. In single tank systems the
tank thermometer will read the temperature of
the water after the mixing valve feeding your fixtures. In two tank systems the thermometer will
read the finished solar tank temperature.
Drain/Purge Valve (BD): Used to charge and
drain the solar loop piping.
Circulating Pump (P): Circulates water through
the collector and solar loop piping.
Control (C): Automatically turns the circulating
pump on and off when there is sufficient heat to
be gained in the solar collector.
Tank Sensor (S2): Wired to your Goldline control. Works in conjunction with the collector sensor to turn your circulating pump on and off at
preset temperature differentials.
P.15
Integral Heat Exchanger (IHX): Transfers heat
from the solar collector loop to the potable water
in the solar storage tank. The heat exchanger is
double walled and vented. If a leak in the heat
exchanger piping occurs there is no possibility
that the potable water in your solar storage tank
can be contaminated with the heat exchange
fluid (water in this case) in the solar loop piping.
Mains Supply Line Isolation Valve (BV1):
When open allows potable water to fill the solar
storage tank or back-up water heater. When
closed isolates the solar storage tank and backup water heater from the pressurized city cold
water supply line.
mileage estimates for automobiles, these component design lives represent average figures for
drainback system components installed in the
United States. The life of your components may
vary.
To obtain warranty service please contact your
installation contractor or SunEarth Inc. for the
name of an authorized service agent near you.
12) CASCADE DRAINBACK SYSTEM MODEL NOS.
EPRD40-80
ECRD40-80
EPRD40-80-2
ECRD40-80-2
EPRD40-80-2G
ECRD40-80-2G
EPRD42-80
ECRD42-80
EPRD42-80-2
ECRD42-80-2
EPRD42-80-2G
ECRD42-80-2G
CopperStor Drainback Reservoir (DBT): An
insulated hot-spun copper reservoir that holds
the collector and solar loop piping heat exchange
fluid (water) when the circulating pump (P) is off.
EPRD48-80
ECRD48-80
EPRD48-80-2
ECRD48-80-2
EPRD48-80-2G
EPRD48-80-2G
Pressure Relief Valve (PRV): Protects the collector and solar loop piping against pressure in
excess of 150 PSI.
EPRD64-80
ECRD64-80
EPRD64-80-2
ECRD64-80-2
EPRD64-80-2G
ECRD64-80-2G
Mixing Valve (MX): Automatically blends hot
water from the solar storage tank with incoming
city cold water to an acceptable set point. A mixing valve must be installed on every Cascade
Drainback solar water heating system.
Optional Flowmeter (FM): Monitors flowrate
through the collector and solar loop piping and
also serves as a sight gauge to determine system
fluid level.
Although an optional feature, a
flowmeter is highly recommended.
Solar Tank Bypass Valves (BV2-4): Allows the
solar tank (ST1) to be completely isolated and
bypassed in the case of tank failure.
11) ESTIMATED COMPONENT LIFE
You can expect a long useful life from the primary components in your Cascade Drainback
solar water heating system by adhering to the
routine service and maintenance tips provided
above.
EXAMPLE: EPRD48-80
Empire Series Collector, Moderately Selective
Painted Absorber Coating, Ruud/Rheem Heat
Exchange Tank, Drainback Tank, 2 each Empire
EP-24 3’ X 8’ Collectors (48 ft2), 80 Gallon Tank.
- 2: Two tank system with back-up electric storage water heater
-2G: Two tank system with back-up gas water
heater
ECRD48-80: Designates SunEarth Empire series
collector with black chrome over nickel absorber
coating.
The SunEarth solar collector and CopperStor
drainback tank have a design life of twenty-five
to thirty years. The solar storage tank should last
twelve to twenty years in most water quality
areas by periodically replacing the anode rod. The
circulating pump and differential control typically
last between twelve and fifteen years. Like EPA
P.16
CASCADE DRAINBACK
Fluid
Ca
(US pacity
gal)
Wet
Wei
(lbs) ght
Max
Pre
(psig ssure
)
Con
Pipe nection
Dia.
(in)
50
5
42
5.0
82
220
3/4
DB-7.5
18
50
5
56
7.5
117
220
3/4
DB-10.0
24
50
5
84
10.0
164
220
3/4
Dr y
Wei
(lbs) ght
Dep
Inch th
es
12
Wid
Inch th
es
DB-5.0
Sun
Mod Earth
el N
o.
Leng
Inch th
es
13) SUNEARTH COPPERSTOR DRAINBACK TANK
AND EMPIRE SERIES COLLECTOR SPECIFICATIONS
Max. Temp of 210° F
BALANCE OF PAGE LEFT INTENTIONALLY BLANK
CASCADE DRAINBACK
P.17
THE
EMPIRE SERIES
GLAZED FLAT PLATE SOLAR COLLECTORS
Models EC and EP SPECIFICATION SHEET
THE VALUE LEADER
IN SOLAR WATER HEATING TECHNOLOGY
• Stainless Steel Fasteners
• Riveted Corners
• Low Iron Tempered Glass
• Low-Binder Fiberglass Insulation
• Rigid Foam Insulation
• Secondary Silicone
Glazing Seal
• Black Chrome or
Moderately Selective
Black Paint
Absorber Coating
• Copper Absorber Plate
• Type M Copper Riser
Tubes and Manifolds
• Extruded Anodized
Aluminum Casing and
Capstrip
• EPDM Grommets
• 15% Silver Brazed Joints
• Vent Plugs
• Primary EPDM Glazing Seal
• Painted Aluminum Backsheet
PROTECTING OUR ENVIRONMENT—SINCE 1978
Std
Wid . Heade
th, I
nch r
es
Std.
Diam Head
er
ete
Nom r, Inche
inal s
Hea
to C der, Ce
ente nter
r, In
che
s
M
Ope aximum
ratin
g
PSIG Press
Fluid
U.S. Capaci
Gall ty
o ns
Des
ig
Rate n Flow
GPM
Pres
at D sure Dr
op
es
Rate ign Flo
in P w
SIG
Max
Rate Flow
GPM
Dry
Wei
g
Lbs. ht,
Net
Ape
Sq F rture
t
Gro
ss A
Sq F rea
t
D ep
Inch th
es
L en
g
Inch th
es
Wid
Inch th
es
Sun
Mod Earth
el N
o.
EMPIRE SERIES SPECIFICATIONS
EC/EP21
40
76
3 1/4
21.12
18.70
70
0.72
0.54
0.003
12
160
43 3/8
1
71.25
EC/EP24
36 1/8
98 1/4
3 1/4
24.61
21.88
80
0.78
0.62
0.005
12
160
39 3/4
1
93 5/8
EC/EP32
48 1/8
98 1/4
3 1/4
32.79
29.81
106
1.00
0.83
0.006
12
160
51 3/8
1
93 5/8
EC/EP40
48 1/8
122 1/4
3 1/4
40.81
37.33
141
1.20
1.04
0.009
12
160
51 3/8
1
115 5/8
EC/EP40-1.5
48 1/8
122 1/4
3 1/4
40.81
37.33
150
1.61
1.04
0.006
25
160
51 3/8
1 1/2
115 5/8
THERMAL PERFORMANCE RATINGS*
MODEL EC
Btu/ft2 /Day
Category
(Ti-Ta)
Ti = inlet fluid temp
Ta = ambient air temp
A(-9oF)
CLEAR
DAY
1,332
o
1,218
1,040
699
390
B(9 F)
C(36oF)
D(90oF)
o
E(144 F)
MILDLY
CLOUDY DAY
1,005
890
720
405
137
A-Pool Heating (Warm Climate) B-Pool Heating
MODEL EP
Btu/ft2 /Day
CLOUDY
DAY
Category
(Ti-Ta)
Ti = inlet fluid temp
Ta = ambient air temp
CLEAR
DAY
MILDLY
CLOUDY DAY
CLOUDY
DAY
1,284
659
971
A(-9oF)
1,169
542
854
B(9oF)
o
984
372
677
C(36 F)
619
89
343
D(90oF)
280
62
E(144oF)
C-Water Heating (Warm Climate) D-Water Heating (Cool Climate) E-Air Conditioning/Industrial Process Heat.
680
565
402
127
-
Thermal performance is obtained by multiplying the collector output for the appropriate application and insolation level by the total gross collector area.
*Collector ratings are derived from the Solar Rating & Certification Corp (SRCC) Document RM-1 and Standard OG-100.
ENGINEERING SPECIFICATIONS
The following shall be the specifications for the solar collectors. Collectors
shall be SunEarth Empire model ________, and shall be of the glazed liquid flat plate type. Collectors shall be tested in conformance with ASHRAE
93-1986, and SRCC 100-81. The collectors also shall be certified by the
SRCC and the Florida Solar Energy Center (FSEC).
GENERAL
The dimensions of the collector shall be _________ inches in length,
_________ inches in width and 3 1/4 inches in depth. The collector casing
shall be an anodized aluminum extrusion (alloy 6063 T5), minimum thickness .060 inch, with an architectural dark bronze finish. The casing shall
have notched framewalls for ease of plate removal and reinstallation. Sheet
metal screwed fasteners shall be stainless steel (18-8 #10). The backsheet
shall be painted textured aluminum not less than .014 inch thickness. A 1
inch vent plug shall be installed in each of the four corners of the backsheet
to minimize condensation.
GLAZING
The collector glazing shall be one sheet of low iron tempered glass, with
a minimum of 1/8 inch thickness (5/32 inch on EP/EC 40), and a minimum transmissivity of 91 percent (89 on EP/EC 40). The glazing shall be
thermally isolated from the casing by a continuous EPDM gasket. There
shall be a continuous secondary silicone seal between the glass and casing capstrip to minimize moisture from entering the casing.
INSULATION
The insulation shall be foil-faced polyisocyanurate foam sheathing board of
a minimum 1 inch thickness, siliconed in place to the aluminum backsheet,
covered by low-binder fiberglass of a minimum 1 inch thickness, providing
Specifications subject to change without notice.
The absorber shall consist of a roll-formed copper plate of no less than .008
inch thickness. Risers shall be a minimum of 1/2 inch O.D. Type M copper
tubing on no more than 4 1/2 inch centers continuously soldered to the
o
plate utilizing a non-corrosive solder paste with a melting point of 460 F.
The risers shall be brazed to 1 1/8 inch O. D. Type M copper manifolds utilizing a copper phosphorous brazing alloy with no less than 15 percent silver content, and conforming to the American Welding Society’s BCuP-5 classification. EPDM grommets shall isolate the manifold from the aluminum
casing. The absorber plate shall be designed for 160 psig maximum operating pressure.
ABSORBER COATING AND PERFORMANCE CURVE
A) Black Chrome (EC Series): The absorber coating shall be black chrome on
nickel with a minimum absorptivity of 95 percent and a maximum emissivity of 12 percent. The instantaneous efficiency of the collector shall be a
minimum Y-intercept of 0.714 and a slope of no less than -0.7271
(BTU/ft2–hr)/F.
B) Moderately Selective Black Paint (EP Series): The absorber coating shall be
a moderately-selective black paint with a minimum absorptivity of 94 percent and a maximum emissivity of 56 percent. The instantaneous efficiency
of the collector shall have a minimum Y-intercept of 0.682 and a slope of
no less than -0.7995 (BTU/ft2–hr)/F.
RO
IB
HIC
S
L
S •
ER
R E C Y C L E D PA P E R — S O Y B A S E D I N K
THERS G
R
SE
R VIC E PRIN
T
ES 9401
NT
AVAILABLE FROM:
UL
• F
www.sunearthinc.com
ABSORBER PLATE AND PIPING
AP
8425 Almeria Ave. • Fontana, CA 92335
(909) 434-3100 • Fax (909) 434-3101
thermal isolation of the foam from the absorber plate. Total thermal resistance shall be a minimum of R-12. The sides and ends of the collector shall
be insulated with a minimum of 1 inch foil-faced polyisocyanurate foam
sheathing board.
VALE
MANUFACTURED BY:
(Performance specifications subject to testing error of +/- 3%)
14) A NOTE ON COMPONENT WARRANTIES
The Cascade Drainback solar water heating system is comprised of a number of component parts. Many
of these components are manufactured by other companies, e.g. Rheem/Ruud, Taco, Grundfos or
Goldline and carry specific warranty coverage as provided by the maker. Product warranty statements
for these components are available from your installation contractor. SunEarth’s warranty coverage is
limited only to those components it directly manufactures. The following Product Warranty Statement
defines SunEarth’s coverage for the solar collectors and the CopperStor drainback reservoir.
15) SUNEARTH PRODUCT WARRANTY STATEMENT
See Cascade Drainback manual pages 21 - 22.
BALANCE OF PAGE LEFT INTENTIONALLY BLANK
CASCADE DRAINBACK
P.20
8425 Almeria Ave. • Fontana, CA. 92335
Phone: (909) 434-3100 • Fax: (909) 434-3101
email: [email protected] • www.sunearthinc.com
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