Carrier 38AUD*12 Series, Инструкция по установке, запуску и обслуживанию

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13
PRELIMINARY CHARGE — Before starting the unit,
charge R-410A liquid refrigerant into the high side of
each 38AUD circuit through the liquid service valve(s).
The amount of refrigerant added must be at least 80% of
the operating charge listed in Table 4 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:
38AUD*16
20 m linear line length
Equivalent line length 30 m
Liquid Lift: 10 m
(linear measure, indoor unit above outdoor unit)
Select line sizes from Table 4 (38AUD):
Liquid
3
/
8
in
Suction 1-
1
/
8
in.
Operating Charge
Each circuit: 7.0 kg (at 23 m linear length)
80% of Operating Charge:
Each circuit: 0.80 x 7.0 = 5.6 kg
Factory Shipping Charge: 2.7 kg
Field-charge quantity: 5.6 kg – 2.7 kg = 2.9 kg
For linear line lengths longer than 38 m (125 ft), contact
your local Carrier representative for system charge value.
Step 6 — Install Accessories
Accessories requiring modifications to unit wiring should
be completed now. These accessories may include Winter
Start controls, Low Ambient controls. Refer to the
instructions shipped with the accessory.
Step 7 — Complete Electrical Connections
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Do not use gas piping as an electrical ground. 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 electrical wire connected to unit ground lug
in control compartment, or conduit approved for
electrical ground when installed in accordance with
local electrical codes or in absence of local codes, it is
recommended that the U.S.A. standard ANSI/NFPA
70, National Electrical Code (NEC), be followed.
!
WARNING
NOTE : Check all factory and field electrical connections
for tightness. Field-supplied wiring shall conform with the
limitations of 33
°
C (63
°
F) rise.
Field Power Supply —
All units are factory wired for the voltage shown on the
nameplate. Refer to unit label diagram for additional
information.
Field power wires are connected to the unit to compressor
contactor C1 and terminal block TB1 pressure lugs in the
unit’s main control box or at factory-installed option
non-fused disconnect switch (see Fig. 11). 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 optional disconnect switch. These leads are
for factory run--test purposes only; remove and discard
before connecting field power wires to unit connection
points. Make field power connections directly to line
connection pressure lugs only.
38A
U
D