Carrier 38AUD Installation, Start-Up And Service Instructions Manual page 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
label 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 refrigerant always be removed
from the cylinder as a liquid. Admit liquid refrigerant into
the system in the discharge line. If adding refrigerant into
the suction line, use a commercial metering/expansion
device 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 high and low side pressures to equalize. If pressures
do not equalize readily, charge R-410A vapor (using special
service manifold with expansion device) into the suction line
service port for the low side of system to assure charge in
the evaporator. Refer to GTAC II, Module 5, Charging,
Recover, Recycling, and Reclamation for liquid charging
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)
1
applies to / -in. OD tube with Novation coil option for
2
unit 38AUZ*08. Check liquid lift capability of
tube against project requirements. Table 5 indicates
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 coil option.)
Suction line size: Select 1-
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 length 82 ft
Equivalent length 123 ft
Liquid lift 25 ft
Select liquid line as 5/8-in OD, suction line as 1-
Note Operating Charge quantity: 21.9 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 lbs (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)
17
5
/ -in OD
8
5
/ -in
8
1
/ -in. OD tube for this line
8
1
/ -in OD.
8