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HTP Drain Back Installation, Start-Up, Maintenance, Parts, Warranty

Solar systems
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Installation
Start-Up
Maintenance
Parts
Warranty
For Residential and Commercial Use
DB Models
The solar energy system described in 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.
This manual must only be used by a qualified installer /
service technician. Read all instructions in this manual
before installing. Perform steps in the given order. Failure to
do so could result in substantial property damage, severe
personal injury, or death.
NOTE TO CONSUMER: PLEASE KEEP ALL INSTRUCTIONS FOR FUTURE REFERENCE.
272 Duchaine Blvd.
Drain Back
Solar Systems
HTP reserves the right to make product changes or updates
without notice and will not be held liable for typographical
errors in literature.
The surfaces of these products contacted by potable
(consumable) water contain less than 0.25% lead by weight
as required by the Safe Drinking Water Act, Section 1417.
New Bedford, MA 02745
www.htproducts.com
lp-585 Rev. 000 Rel. 001 Date 9.10.18

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Summary of Contents for HTP Drain Back

  • Page 1 The solar energy system described in 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. HTP reserves the right to make product changes or updates This manual must only be used by a qualified installer / without notice and will not be held liable for typographical service technician.

  • Page 2: Table Of Contents

    AHJ. 2. Collector Angle (Tilt) 3. Collector Plane (Horizontal or Vertical) NOTE: HTP, Inc. reserves the right to modify product technical E. Collector Piping specifications and components without prior notice. F. Collector Loop Pipe Insulation For Your Records G.

  • Page 3: Introduction

    High heat sources (sources generating heat 100 F / 37 C or greater, solar system when there is no longer a demand for hot water. Drain back such as stove pipes, space heaters, etc.) may damage plastic systems have fewer components than pressurized systems, making components of the water heater as well as plastic vent pipe materials.

  • Page 4: When Servicing The Solar Water Heating System

    95/5 lead-free solder. Use only pipe rated for F minimum on both the collector return and supply piping. 1 1/2 to 2 minutes PEX piping is approved for use in the solar loop of drain back systems About 30 seconds ONLY.

  • Page 5: Part 2 - Important Information

    Freeze protection must be implemented in C.

  • Page 6: System Design

    The systems shall have a pressure-only relief valve installed The solar collector should be installed at an angle between 20 – 80 at the drain back tank location or the tank shall be vented to ensure optimal operation. the atmosphere. The pressure rating for this valve shall be For year-round domestic hot water, the collector should be tilted to no less than 25 psi and no more than 50 psi.

  • Page 7: Collector Loop Pipe Insulation

    (10) feet. In addition, all non-vertical solar collector piping should pitch 1/4” per foot down to the drain back tank to facilitate proper drainage. Figure 2 - Sensor Cable Detail Ensure that there are no dips or low points in solar piping that H.

  • Page 8: Hail Resistance

    • Thermal expansion tank installed C. Locating the Drain Back Tank This drain back tank is certified for indoor use only. DO NOT INSTALL • Water heater and fixtures have been properly purged of air OUTDOORS. Outdoor installations ARE NOT covered by warranty.

  • Page 9: Specifications And Dimensions

    The drain back tank should also be installed in a place where T&P discharge or a leak will not result in damage to the surrounding area.

  • Page 10: Water Chemistry Requirements

    Water quality must be professionally analyzed to determine whether Copper or PEX may be used in the solar loop piping of drain back it is necessary to treat the water. Various solutions are available to systems.

  • Page 11: Installation Of The Drain Back Tank

    Flushes sediment which may accumulate on the bottom of the solar 2. Pipe drain back tank outlet (located near the bottom of the tank) water heater and also provides a means of draining the tank.

  • Page 12: Solar System Pump

    3. Move the clamp over the tube and onto the sight tube fitting. This will secure the tube to the fitting. See Figure 6. 4. Fit one (1) clamp on the other end of the solar drain back tank sight tube. Move the clamp about two inches down the sight tube.

  • Page 13: Applications

    7. Due to extreme temperatures, circulators with integral flow checks are not to be used in solar systems. If circulator comes equipped with an integral flow check, remove it. 8. Non-vertical drain back solar system piping should pitch ¼” per foot back to the tank to facilitate draining. 9. No check valves are allowed in the solar loop.
  • Page 14 7. Due to extreme temperatures, circulators with integral flow checks are not to be used in solar systems. If circulator comes equipped with an integral flow check, remove it. 8. Non-vertical drain back solar system piping should pitch ¼” per foot back to the tank to facilitate draining. 9. No check valves are allowed in the solar loop.

  • Page 15: Part 6 - Fluid Quality

    Glycol may need to be changed periodically (every 3-5 years) to prevent it from 2. Open fill valve and the bleed valve on the drain back tank sight becoming acidic; please refer to the guidelines provided by the tube (see Specification drawings for locations).

  • Page 16: Shutdown Procedures

    WATER HEATER “OFF” AND CALL A PLUMBER IMMEDIATELY. A. Shutdown Procedures Simply unplug the solar controller to shut down the drain back system. Part 9 - Troubleshooting The pump will stop and water will drain out of the collectors into the reservoir.

  • Page 17: Part 10 - System Parts Listing

    Tank Component Manufacturer Item Model # Coverage Coverage Drain 5 (Five) HTP, Inc. Back SSU-10DB 1 (One) Year Years Figure 9 - Drain Back Tank Replacement Parts Tank Table 6 - Warranty Periods lp-585 Rev. 000 Rel. 001 Date 9.10.18...
  • Page 18 lp-585 Rev. 000 Rel. 001 Date 9.10.18...
  • Page 19 lp-585 Rev. 000 Rel. 001 Date 9.10.18...
  • Page 20 VISCOSITY: The HTF viscosity over the service temperature range is may cause flaking and softening of skin. based on a specific gravity 15/15 C (60/60 F) 1.053-1.063. DOWFROST FIRST AID: WASH OFF IN FLOWING WATER OR SHOWER inhibited glycol-based fluid has an effective operating temperature range of -50 F to 250 F.
  • Page 21 Model Number Key: The first two letters refer to the type of system, followed by solar storage tank gallons, square footage of collectors, and back-up type. For example: DB-80-40-GB refers to a Drain Back System with 80 gallons of storage, a 40 square foot solar collector, and Gas- Fired Back-up.
  • Page 22 This Page Left Intentionally Blank. lp-585 Rev. 000 Rel. 001 Date 9.10.18...
  • Page 23 lp-585 Rev. 000 Rel. 001 Date 9.10.18...
  • Page 24 This Page Left Intentionally Blank. lp-585 Rev. 000 Rel. 001 Date 9.10.18...

  • Page 25: Limited Warranty

    7. Any incidental, consequential, special, or contingent damages or C. In the event of a leakage of water of a replacement drain back tank expenses arising, directly or indirectly, from any defect in the drain due to defective material or workmanship, malfunction, or failure to back tank or the use of the drain back tank.
  • Page 26 Any claim for warranty assistance must be made promptly. Deter- limitation or exclusion may not apply to the Owner. mine if the drain back tank is “in-warranty” (that is, within the ap- These are the only written warranties applicable to the drain back tank plicable warranty period) by reviewing a copy of the original sales manufactured and sold by HTP.

  • Page 27: Customer Installation Record Form

    Customer Installation Record Form The following form should be completed by the installer for you to keep as a record of the installation in case of a warranty claim. After reading the important notes at the bottom of the page, please also sign this document. Customer’s Name Date of Installation Installation Address...

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