3.7.3
Refrigerant Piping Pressure Test and Evacuation
Perform the following when field piping connections are provided.
a.
Pressure Test: Test refrigerant piping using dry, oil-free
nitrogen, and prove tight at 2068 kPa 300 psi on the high side and
1027 kPa 150 psi on the low side. Maintain pressure for 2 hours
with no leakage or reduction in gage pressure.
b.
Evacuation: Using high vacuum pump and certified micron gage,
reduce absolute pressure on both sides of system simultaneously to
300 microns 300 microns. After reaching this point charge system
with proper refrigerant until pressure of 0 kPa 0 psi is obtained.
Repeat evacuation-charging procedure for two more cycles,
totaling to three evacuation-charging cycles. On final
evacuation, secure pump and maintain 300 microns 300 microns for 2
hours before charging with required final refrigerant.
3.7.4
3.7.4.1
Field Testing
Test each item of equipment in operation for continuous period of not less
than 24 hours under every condition of operation in accordance with each
equipment manufacturer's recommendation. Verify that each item of
equipment operating parameters are within limits recommended by the
manufacturer.
3.7.4.2
Field Test Plans
Furnish water-source heat pump [and closed circuit cooler] field test plans
developed by each equipment manufacturer detailing recommended field test
procedures for each item of equipment. Field test plans developed by the
installing Contractor, or the equipment sales agency furnishing the
equipment will not be acceptable. The Contracting Officer will review and
approve the field test plan for each item of equipment listed below prior
to commencement of field testing of the equipment.
a.
Equipment Items to Test:
[Water-source water-to-air heat pumps - field acceptance test plan]
[Water-source water-to-water heat pumps - field acceptance test
plan]
[Closed Circuit Coolers - field acceptance test plan]
[Plate Heat Exchangers - field acceptance test plan]
b.
Coordinated Testing: Indicate in each field test plan when work
required by this section requires coordination with test work
required by other specification sections. Furnish test procedures
for the simultaneous or integrated testing of equipment controls
which interlock and interface with controls factory prewired or
external controls for the equipment provided under [Section 15901N
SPACE TEMPERATURE CONTROL SYSTEMS] [Section 15910N DIRECT DIGITAL
CONTROL SYSTEMS].
SECTION 15741N
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