Step 7 - Install Accessories; Step 8 - Complete Electrical Connections - Carrier Gemini 38AU 07 Series Installation, Start-Up And Service Instructions Manual

EVACUATION/DEHYDRATION
Evacuate and dehydrate the connected refrigeration system(s) (ex-
cluding the 38AU unit) to 500 microns using a two-stage vacuum
pump attached to the service ports outside the 38AU service
valves, following description in GTAC II, Module 4, System
Dehydration.
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
R-410A refrigerant systems operate at higher pressures than
standard R-22 systems. Do not use R-22 service equipment or
components on R-410A refrigerant equipment.
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 cyl-
inders. 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 po-
sition (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 rec-
ommended 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 oper-
ating charge listed in Tables 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 man-
ifold 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 Reclama-
tion for liquid charging procedures.
Example:
38AUZ*12
60-ft (18.3 m) linear line length
Equivalent line length 90-ft (27.4 m)
Liquid Lift: 20-ft (6.1 m)
Select line sizes from Table (38AUZ):
Liquid / in.
1
2
Suction 1 / in.
1
8
Charge 23.1 lbs (at 75-ft linear length)
80% of Operating Charge:
0.80 x 23.1 = 18.5 lbs
Factory Shipping Charge: 9 lbs
Field-Charge quantity: 18.5 - 9.0 = 9.5 lbs
Step 7 — Install Accessories
Accessories requiring modifications to unit wiring should be com-
pleted now. These accessories may include Winter Start controls
and Low Ambient controls. Refer to the instructions shipped with
the accessory.
Step 8 — Complete Electrical Connections
ELECTRIC SHOCK HAZARD
Failure to follow this warning could result in personal injury or
death.
Unit cabinet must have an uninterrupted, unbroken electrical
ground to minimize the possibility of personal injury if an
electrical fault should occur. This ground may consist of elec-
trical wire connected to unit ground lug in control compart-
ment, or conduit approved for electrical ground when installed
in accordance with NEC; ANSI/NFPA 70, latest edition (in
Canada, Canadian Electrical Code CSA [Canadian Standards
Association] C22.1), and local electrical codes.
NOTE: Check all factory and field electrical connections for tight-
ness. Field-supplied wiring shall conform with the limitations of
63°F (33°C) rise.
FIELD POWER SUPPLY
If equipped with optional Powered Convenience Outlet: The pow-
er source leads to the convenience outlet's transformer primary are
not factory connected. Installer must connect these leads accord-
ing to required operation of the convenience outlet. If an always-
energized convenience outlet operation is desired, connect the
source leads to the line side of the unit-mounted disconnect.
(Check with local codes to ensure this method is acceptable in
your area.) If a de-energize via unit disconnect switch operation of
the convenience outlet is desired, connect the source leads to the
load side of the unit disconnect. On a unit without a unit-mounted
disconnect, connect the source leads to compressor contactor C
and indoor fan contactor IFC pressure lugs with unit field power
leads.
Field power wires are connected to the unit at line-side pressure
lugs on compressor contactor C and TB1 (see wiring diagram la-
bel for control box component arrangement) or at factory-installed
option non-fused disconnect switch. Max wire size is #4 AWG
(copper only).
NOTE: TEST LEADS — Unit may be equipped with short leads
(pigtails) on the field line connection points on contactor C or op-
tional disconnect switch. These leads are for factory run-test pur-
poses only; remove and discard before connecting field power
wires to unit connection points. Make field power connections di-
rectly to line connection pressure lugs only.
FIRE HAZARD
Failure to follow this warning could result in personal injury,
death, or property damage.
Do not connect aluminum wire between disconnect switch and
unit. Use only copper wire.
14
WARNING
WARNING