Bosch Geothermal Heat Pumps, Руководство по применению

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Applications Manual Bosch Geothermal Heat Pumps | 105
Bosch Thermotechnology Corp.
Data subject to change
16.8 Bosch Geothermal Water-to-Water Heat
Pump Piping System Installation
Once designed, proper installation techniques must be
used to insure a problem-free system. When piping is
hung, 1-¼" and smaller tubing must be supported every
6 ft.; 1-½" and larger tubing must be supported every
10 ft. Always support the pipe where a transition from
horizontal to vertical is made. Plastic coated or copper
hangers should be used, allowing enough space for the
pipe insulation. Standoff type supports are good for rigid
support, wall runs or short runs less than 10 ft. Clevis
hangers (held by threaded rod) are good for piping at
different heights. Rail type hangers are good for different
types of pipe (e.g. water, conduit, etc.). Polyethylene
clips are best for small pipes. Always run piping at
90 or 45 degree angles. Local codes supersede any
recommendations in this applications manual.
Two types of soldering material may be used for hydronic
installations, 50/50 (50% tin, 50% lead) and 95/5 (95%
tin, 5% antimony). However, 50/50 may not be used for
domestic water piping. Solder type 50/50 " diameter
solder has a melting point of approximately 361-421°F,
and is typically applied using a propane torch. Proper ux
is always required. An acetylene torch may be used, but
care must be taken not to overheat the piping, which can
cause the material to become brittle. Solder type 95/5
" diameter solder has a melting point of approximately
452-464°F, and is typically applied using a map gas torch
(propane will work). Proper ux is always required. An
acetylene torch may be used, but care must be taken not
to overheat the piping, which can cause the material to
become brittle.
When preparing copper joints for soldering, tubing should
be cut square, and all burrs must be removed. Do not
use dented or pitted copper. Clean the inside of the
tubing with a brush; clean the outside with emery cloth
approximately ½" from the end of the tting. Debris in
the system could cause pump failure or corrosion. Do
not put the tting in a bind before soldering. Flux should
be applied as a thin lm. Excess ux will end up in the
circulating uid. Rotate a tting while soldering to spread
ux over the entire tting.
Once the tting has been prepared, always avoid using
too much solder. Typically, a silver ring will appear on
the tting. If solder drips, the joint has excess solder.
Excess solder can get into the system circulating uid.
Approximately 0.9" of " diameter solder is all that is
needed for ¾" copper; 1.3" is needed for 1" copper; and
1.7" is needed for 1-¼" copper.
Always let a joint cool naturally. Cooling with water
can cause high stress at the joint area, and potentially
premature failure, especially when heavy objects are
soldered in place, such as pumps. Once the joint is cool,
wipe any excess ux to lessen potential surface oxidation.
Keep the piping open to the atmosphere. Pressure can
cause blowout of material when heated, causing pin-hole
leaks. When a thread by sweat (soldered) transition tting
is used, always make the soldered connection rst, and
then make the threaded tting using proper sealants.
Adequate ventilation must be present when soldering, as
ux fumes can be dangerous.
When soldering valves and unions, always use care not
to overheat the non-metallic components. Always remove
synthetic gasket material from dielectric unions before
soldering, and always small strips of damp, clean rags
when soldering.