7
2005 Boreal Geothermal Inc.
www.boreal-geothermal.com
BOREAL
® Vertical Style ACDX — Typical Loop design
Attention!
Layout for one borehole shown below.
Actual installation requires one borehole
per ton. (I.E. (3) holes for a ACDX-45,
(4) holes for a ACDX-55 and (5) for a
ACDX-65
M
axi
m
u
m
120
ft
.
6 ft
.
Pinch around pipes
and silver braze.
Keep pipes up 1/2”
off bottom to insure
good flow.
7/8” Stub Cap (Copper)
Boreal ® ACDX-to-Air
or
ACDX-to-Water Heat
Insulate liquid line
to here
Spacers
Liquid Line
Vapor Line
Trench
Notes:
⇒
Drill vertical bore to a depth of 100 to 120 ft.
⇒
Pre-assemble or construct on site the dual (3/8” and 1/2”) piping as-
sembly required. Seal both ends and pressurize with 150 psig. nitrogen
for leak checking. Silver brazing a schrader valve in the end of the 3/8”
line will allow gauge checking for loss of pressure.
⇒
Check for leaks with soap suds. After a minimum 2 hr waiting period,
recheck the line for loss of pressure. If the
temperature
of the loop
hasn’t changed then the
pressure
should be same as it was originally.
⇒
Insulate both liquid lines and vapor lines from the heat pump to the
well head unless in separate horizontal trenches. Vapor lines in separate
horizontal trenches need only be insulated from 10 ft. out in the trench
to the basement wall. Liquid lines must be insulated from the heat
pump to approx. 6 ft. down the drop pipes in the vertical boreholes.
⇒
Install spacers to keep the pipes separated as far as possible from one
another in the boreholes.
⇒
Install 100 - 120 ft. of dual tubing (1/2” vapor & 3/8” liquid). Recheck
pressure on lines. Secure pipes through opening in borehole head.
Backfill with pea gravel to 30ft. from top. Seal hole with bentonite
clay from 30 ft. to surface.
⇒
Install linesets from well heads in horizontal trenches to heat pump in
building. Silver braze all joints with 5% silver solder using dry nitrogen
to purge the system. When all joints are complete, pressurize the entire
system with 150 psig. nitrogen and recheck for leaks. Vacuum until
system stays below 500 microns for five minuites after vacuum pump
has been shut off.
⇒
Charge the prescribed amount of refrigerant through the high side
schrader valve located on the front of the machine.
