Crown Royal Stoves RS7300MP, Installation, Operation & Maintenance Manual, Page: 13 / 58

Underground insulated pipe is a crucial part of your installation. It is designed to transfer hot water from your furnace to your home,
garage or shop. Selecting the correct underground pipe depends on several factors such as climate and distance. Choosing a pipe
with the least possible heat loss is the most effective way to ensure your furnaces efficiency.
• Ridged Insulated Underground Tubing – Ridged insulated pipe manufactured with the highest possible R value ratings.
• Foam Filled Insulated Underground Tubing – Designed to respond to intensive environments and climates. Insulated with high
quality closed cell polyolefin or polyethylene foam and shelled in a virgin plastic corrugated tile.
• Foil Wrapped Insulated Underground Tubing - Competitively priced closed cell polypropylene foil wrapped Insulation and sleeved
in Heavy Duty UV protected drain tile.
Make sure your insulated underground tubing is equipped with at least one supply and one return pipe. This pipe should be at least
one inch inside dimension; which is rated at 180 degrees F and 100 PSI continuous flow. Pipe should have a construction of
polyethylene and an oxygen barrier.
Insulated underground tubing must be without any splices, couplings and joints. Both tubing and piping inside should be one
continuous run. Underground insulated tubing needs to be free of damages or punctures that which would allow ground water or soil
to come in contact inside insulation and piping. Allowing such contact will cause moisture to seep through the insulated pipe and
result in extreme heat loss. Insulated underground tubing must remain water tight or will be required to be replaced.
Installation Requirements:
• The trench must be 24” deep and 8” - 12” wide. If possible have a gradual slope in your trench to allow drainage away from
lines and out of the trench bottom. Place electrical supply in bottom of trench and cover with 6” of gravel or dirt. At this point a
water barrier is required. Several methods are possible, but the most important factor is; if ground water comes in contact with
your heating lines, it will be the greatest heat loss to your system. A minimum of R10 insulation value is recommended, and a
water-tight vapor barrier such as a continuous poly tube of plastic PVC pipe to encase your insulation is a must. NOTE: If you
need to bury lines under an area where vehicles will cross, you should increase the depth of trench to three feet or place planks
over the trench in that area to spread the load and reduce the pressure generated on the lines.
•
All wiring must conform to local codes. Use an electrical wire rated and approved for underground installations. This wiring can
be placed in the same trench below the water lines. Use 12-2 UF wire with ground to provide power to the draft inducer
blower, aqua stat, night light, etc. at the stove. This is satisfactory for most applications but a state certified electrician must be
consulted.
• The supply and return tubing and the power wire can be lowered in the trench, brought through the buildings being heated,
and extended a minimum of 36” out of the soil where the stove is to be placed. Seal the openings around the tubing where it
enters the building and seal the tubing where it extends out of the ground at the location where the stove is to be placed.
•
Connections to the furnace are clearly marked. The installation of isolation valves at both ends of the pump is recommended as
well as a valve at the return line. This will allow you to shut off water supply for repair or if additional heating components are
added to the system. It is recommended that piping used is able to withstand 100 PSI at 180 F, and is at least 1” (inch ) in
diameter. 1 1/4 “(Inch) piping is recommended for larger systems. A single junction box at the rear of the furnace is include d for
your power supply, and should be connected by a qualified person.
•
A hole large enough to accommodate two lines and insulation is required and attention to sealing this point of entry is very
important. Be sure to bring pipes, insulation and vapor barrier completely through wall and seal from both sides.
TRANSFER LINE - INSTALLATION
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