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Evacuation/Dehydration
Evacuate and dehydrate the connected refrigeration system(s)
(excluding the 575J unit) to 500 microns using a two-stage
vacuum pump attached to the service ports outside the 575J
service valves, following description in GTAC II, Module 4,
System Dehydration.
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
Puron
®
(R-410A) refrigerant systems operate at higher
pressures than standard R-22 systems. Do not use R-22
service equipment or components on Puron refrigerant
equipment.
IMPORTANT: Charge in Cooling mode only!
Preliminary Charge
Before starting the unit, charge R-410A liquid refrigerant into
the high side of each 575J circuit through the liquid service
valve(s). The amount of refrigerant added must be at least 80%
of the operating charge listed in Table 5 for LINEAR line
length LESS the factory charge quantity (if factory shipping
charge has not been removed). See the following example.
Allow high and low side pressures to equalize. If pressures do
not equalize readily, charge R-410A vapor (using special ser-
vice manifold with expansion device) into the vapor line ser-
vice 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:
575J*08
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 5:
Liquid 1/2 in.
Vapor 1-1/8 in.
Charge 23.0 lb (at 75 ft linear length)
80% of Operating Charge:
0.80 x 23.0 = 17.6 lb
Factory Shipping Charge: 9 lb
Field-charge quantity: 17.6 lb – 9.0 lb = 8.6 lb
For linear line lengths longer than 100 ft (30.5 m), contact
your local Bryant 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, phase monitor, Compressor
Lockout. Refer to the instructions shipped with the accessory.
Additionally, for low ambient controls, refer to Table 10.
WARNING
Table 10 — Minimum Outdoor Air Operating
PERCENT
UNIT
COMPRESSOR
CAPACITY
575J*07G/H
100
575J*08M/N
100
575J*12G/H
100
NOTE(S):
a. Applies to Cooling mode of operation only.
b. Wind baffles (field-supplied and field-installed) are recommended for all units
with low ambient head pressure control. Refer to Low Ambient Control Instal-
lation Instructions (shipped with accessory) for details.
Step 7 — Complete Electrical Connections
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal inju-
ry 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 NEC (National Electrical Code); AN-
SI/NFPA 70, latest edition (in Canada, Canadian Electrical
Code CSA [Canadian Standards Association] C22.1), and
local electrical codes.
NOTE: Field-supplied wiring shall conform with the limita-
tions of minimum 63°F (33°C) rise.
FIELD POWER SUPPLY
If equipped with optional Powered Convenience Outlet: The
power source leads to the convenience outlet's transformer pri-
mary are not factory connected. Installer must connect these
leads according 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 dis-
connect. (Check with local codes to ensure this method is ac-
ceptable 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 with unit field power leads.
Field power wires are connected to the unit at line-side pres-
sure lugs on compressor contactor C and TB1 (see wiring dia-
gram label for control box component arrangement) or at
factory-installed option non-fused disconnect switch. Max wire
size is no. 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.
FIRE HAZARD
Failure to follow this warning could result in intermittent
operation or performance satisfaction.
Do not connect aluminum wire between disconnect switch
and condensing unit. Use only copper wire. (See Fig. 8.)
12
Temperature
MINIMUM OUTDOOR
TEMP, °F (°C)
Head Pressure
Standard Unit
Control
35 (1.7)
–20 (–28.9)
35 (1.7)
–20 (–28.9)
35 (1.7)
–20 (–28.9)
WARNING
WARNING
a
b
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