3.4
FLUSHING GROUND HEAT EXCHANGER
Before connection of the plastic ground heat exchanger loops to the header,
flush each loop thoroughly in accordance with IGSHPA 21020 recommendations
and leave filled with clean water. If the loop is not immediately joined
to the header, it shall be taped or capped.
3.5
ADJUSTMENTS
Adjust controls and equipment so as to give satisfactory operation. Adjust
entire water temperature control system and place in operation so that
water quantities circulated are as indicated. Adjust and balance air duct
systems so that air quantities at outlets are as indicated and so that
distribution from supply outlets is free from drafts and has uniform
velocity over the face of each outlet.
3.6
INSTRUCTING OPERATING PERSONNEL
Upon completion of work and at time designated by Contracting Officer,
provide services of water source heat pump manufacturer's technical
representative for period of not less than one 8-hour working day for
instruction of Government operating personnel in proper operation and
maintenance of equipment.
3.7
FIELD QUALITY CONTROL
Upon completion and before final acceptance of work, test each system in
service to demonstrate compliance with the contract requirements. Adjust
controls and balance systems prior to final acceptance of completed
systems. Test controls through every cycle of operation. Test safety
controls to demonstrate performance of required function. Correct defects
in work provided by Contractor and repeat tests. Furnish fuel, water,
electricity, instruments, connecting devices, and personnel for tests.
Flush and clean piping before placing in operation. Clean equipment,
piping, strainers, ducts, and filters.
3.7.1
Piping Systems Except for Ground Heat Exchanger and Refrigerant
Before insulating, hydrostatically test each new piping system at not less
than 1278 kPa 188 psi. Maintain pressure for 2 hours with no leakage or
reduction in gage pressure. Obtain approval before applying insulation.
3.7.2
Flow Test of Ground Heat Exchanger Piping
Before backfilling the trenches, flush and purge systems of air and flow
test to ensure all portions of the heat exchanger are properly flowing
using the procedures recommended by IGSHPA 21020. Utilize a portable
temporary purging unit consisting of the following:
a.
High volume, high head purge pump
b.
Open reservoir
c.
Filter assembly with bypass
d.
Flow meter
e.
SECTION 15741N
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