WaterFurnace OM1500MW Owner's Manual - Closed Loop Systems
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ABOUT YOUR WATERFURNACE SYSTEM
Closed Loop Systems
Horizontal Loops
Horizontal earth loops are used where the space allowed for the loop is not
extremely limited. There are various designs of horizontal loops. There is not one
type of horizontal loop that is best for every application. The selection of which
type to use should be based on system size, space available, soil conditions
and the type of excavating equipment used. Regardless of the type selected,
operating costs will not vary substantially.
If you have this loop type, record information here
Number of trenches or horizontal bores: ____________
Length of each trench: ____________
Number of pipes in trench: ____________ Pipe size: ____________
Vertical Loops
Vertical loops are used where space is limited or where soil conditions are not
conducive to horizontal loops. Installing vertical loops requires the use of a
drilling rig. Multiple holes are bored. A double pipe connected with a U-bend is
inserted into each hole. The hole is then filled with grout to provide good contact
around the pipe and to seal the hole. The vertical pipes are then connected to a
header system horizontally a few feet below the surface.
If you have this loop type, record information here
Number of bore holes: ____________
Depth of each bore hole: ____________ Pipe size: ____________
Pond Loops
Pond loops are a cost-effective way to install a geothermal system because
trenching is limited to only the supply and return piping from a pond to the house.
Pond loops consist of a series of coils connected together and placed at the
bottom of a pond. In order for a pond to be suitable for a geothermal application
in a typical home, the pond should be at least 1/2 acre in surface area and at least
8 ft. deep, even during a dry spell. Ideally, the pond should be close to the home
(less than 200 ft.). If the pond is farther from the home, the benefit of using a
pond loop is reduced due to added trenching, materials and pumping costs.
If you have this loop type, record information here
Number of coils: ____________ Pipe size: ____________
Depth of pond where coils are located: ____________
Water Supply for all Closed Loops
Closed loops require no regular maintenance. However, if you notice air noise within the piping or if your loop is ever
damaged by excavation, contact your dealer.