SAHP BMTB 130 - Page 35

SAHP - BMTB Installation Manual |35
V1 Mar 2019US - SD667052
SECTION 11
!
REPLACEMENT
OF PARTS continued
10.6 Nitrogen pressure test
(a) Once the replacement heat pump has successfully
brazed, proceed to pressure test the refrigeration
circuit with oxygen free nitrogen. Ensure the
service ports remain open, nitrogen may then be
introduced using the service port connection as
  showningure5.
(b) Fill the system to 115 psi, hold and monitor for
45 minutes. Check all the newly brazed refrigeration
connections with a leak detector. If during the 45
minutes of monitoring the pressure in the system
  declines,re-braze,tightenorre-areconnectionsand
restart the test. Repeat if necessary until pressure is
maintained for the 45 minutes.
NOTE: Ensure through the process that the pressure does not
exceed 145 psi in the Thermodynamic Panel and/or the pipe work
10.7 Vacuum
(a) Once the replacement heat pump has been successfully
pressure tested and no leakage of nitrogen has been
  conrmed,thenitrogencanthenbevented.
(b) The vacuum pump must then be connected into the
service port to begin vacuuming the system. Vacuum
the system to 0.5 torr (500 microns) and below for a
minimum of 45 minutes.