SAHP BMTB 130 - Page 36

36| SAHP - BMTB Installation Manual
V1 Mar 2019US - SD667052
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REPLACEMENT
OF PARTS continued
10.8 Charge with Refrigerant
(a) Once the replacement heat pump has been successfully
vacuumed, proceed to charge the unit with the
appropriate volume of R134A refrigerant.
 (b) TochargethesystemrstensuretoplacetheR134A
refrigerant bottle onto appropriate and accurate
weighing scales and zero the scales to allow you to
monitor accurately the quantity of refrigerant entering
the system. Ensure the refrigeration gauges and
connected lines have been purged with R134A before
use. Proceed to connect the refrigeration charging line
to the suction line service valve.
 (c) ABMTBrequires2.6Ibsofrefrigeranttobecharged
  forpipeworkseparationdistancesupto26.2’between
the heat pump and evaporator. If the
  pipeworkseparationisgreaterthan26.2’,an
  additional1.6ozper3ftofR134Awillberequired
  (upto12.8ozadditionallyR134A–3.4Ibsmaximum
refrigeration quantity within the system).
(d) When charging, the differential in pressure between
the R134A bottle and BMTB refrigeration circuit
will facilitate the passive movement of refrigerant
into the BMTB. When passive movement ceases
to facilitate the entry of refrigerant, turn the unit on at
the fuse spur. The compressor will actuate after 1
minute, and will proceed to draw R134A refrigerant
from within the refrigerant bottle. Monitor the weight of
refrigerant carefully until the required quantity of
refrigerant has been transferred to the BMTB, at which
time close all refrigeration isolation valves.
(e) Proceed to remove any connected refrigeration
equipment suitably and follow the commissioning
guidelines outlined within section 7 and section 13 of
this manual.
SECTION 11