17
This unit is designed for use with Puron (R--410A)
refrigerant. Do not use any other refrigerant in this
system.
Puron (R--410A) refrigerant is provided in pink (rose)
colored cylinders. These cylinders are available with and
without dip tubes; cylinders with dip tubes will have a
labe l indicating this feature. For a cylinder with a dip
tube, place the cylinder in the upright position (access
valve at the top) when removing liquid refrigerant for
charging. For a cylinder without a dip tube, invert the
cylinder (access valve on the bottom) when removing
liquid refrigerant.
Because Puron (R--410A) refrigerant is a blend, it is
strongly recommended that refri gerant a lways be removed
from the cylinder as a liquid. Admit liquid refrigerant into
the system in t he discharge line. If adding refrigerant into
the suction line, use a commercial metering/expansion
devic e at the gauge manifold; remove liquid from the
cylinder, pass it through the metering device at the gauge
set and then pass it into the suction line as a vapor. Do not
remove Puron (R--410A) refrigerant from the cylinder as a
vapor.
Preliminary Charge —
Before starting the unit, charge R-410A liquid refrigerant
into the high side of each 38AU circuit through the liquid
service valve(s). The amount of refrigerant added must be
at least 80% of the operating charge listed in Tables 5 or 6
for LINEAR line length LESS the factory charge quantity
(if factory shipping charge has not been removed). See
example below.
Allow hig h and low side pr es s u res to equalize. If pres s u res
do not equalize readily , charge R-410A vapor (using special
serv ice manifold with expansio n device) into the suction line
service port for the low side of system to assure charge in
the evaporator . Refer to GTAC II, M odule 5, Charging,
Recov er, Recyclin g, and Reclamation fo r liquid charg ing
procedures.
Example (using Tables 5 and 6):
Unit 38AUZA08 with Novation coil
Linear line length 25 m
Estimated equivalent line length 37 m (add 50% to linear
length)
Liquid lift 8 m (indoor unit above outdoor unit)
See Table 5, 38AUZ models, for line sizes and system
operating charge. Enter table in Equivalent Length column
for 34-46 m.
Liquid line size: Note that a DNU code (Do Not Use)
applies to
1
/
2
-in. OD tube with Novation c oil opti on for
unit 38AUZ*08. Check liquid lift capability of
5
/
8
-in OD
tube a gainst project requirements. Table 5 indicates
5
/
8
-in
tube allows 10 m lift which exceeds job requirements.
(Note: If maximum liquid lift value is not greater than
project requirements, STOP. Select a new location for the
outdoor unit that reduces lift and/or length requirements
or select a unit model with RTPF c oil option.)
Suction line size: Select 1-
1
/
8
-in. OD tube for t his line
length.
Note Operating Charge quantity: 9.9 kg.
Start-up Charge Calculation
Target start-up charge quantity is 80% of Operating
Charge quantity:
Start-up Charge = 0.80 x 9.9 = 7.9 kg (use for recharge
situation)
Deduct Shipping Charge if still available (new unit
installation):
Shipping Charge (from Table 1A): 2.2 kg
Field-Add for Start-up: 7.9 – 2.2 = 5.7 kg (use for new
unit installation)
EN Units:
38AUZA08 with Novation coil
Linear lengt h 82 ft
Equivalent length 123 ft
Liquid lift 25 f t
Select liquid line as 5/8-in OD , suctio n line as 1-
1
/
8
-in OD.
Note Op eratin g Charg e quantity: 2 1.9 lbs
Start-up Charge Calculation
Target start-up charge quantity is 80% of Operating
Charge quantity:
Start-up Charge = 0.80 x 21.9 = 17.5 l bs (use for
recharge situation)
Deduct Shipping Charge if still available (new unit
installation):
Shipping Charge (from Table 2A): 4.6 lbs
Field-Add for Start-up: 17.5 – 4.6 = 12.9 lbs (use for
new unit installation)
38AU
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