Condenser Fan Control For Condenser; Units Used With 30Hxa Units; Step 5 - Install Accessories; 30Hxa Low-Ambient Operation - Carrier EVERGREEN 30HXA Installation Instructions Manual

Terminals 7 and 9 of TB2 has been provided for a
field-supplied circuit A fan control relay for the remote
condenser (30HXA) or a condenser pump relay (30HXC). Use
relays with a maximum coil rating of 75-va. Terminals 8 and 9
of TB2 have been provided for a field-supplied circuit B fan
control relay for a remote condenser (30HXA only). Use relays
with a coil rating of 75-va. A separate field power supply is
NOT required. Maximum load allowed for the fan/condenser
pump relays is 75-va sealed, 360-va inrush at 115 or 230 volts.
See Fig. 18.

CONDENSER FAN CONTROL FOR CONDENSER

UNITS USED WITH 30HXA UNITS — The main base
board provides 2 control outputs for energizing and deenergiz-
ing remote fan contactors. If desired, wire the circuit A main
fan contactor between terminals 7 and 9 of TB2. The circuit B
main fan contactor may be wired between terminals 8 and 9 of
TB2. This will cause the main fans to be on when the compres-
sors are on. Refer to Fig. 18 for wiring details.
NOTE: The fan contactor relays are pre-wired to unit control
power. A separate power supply is NOT required. The
maximum load allowed for these relays is 75-va sealed, 360-va
inrush at 115 or 230 volts.
Step 5 — Install Accessories —
trol accessories are available to provide the following features:
• Control transformer
• Cooler pump interlock
• Cooler pump control
• Remote enhanced display
• Remote alarm
• Remote on-off
• Pulldown control
• Occupancy scheduling
• Demand limit control (requires EMM [energy manage-
ment module])
• Temperature reset (4 to 20 mA, requires EMM module)
• Dual set point control
• Condenser water sensors
• Carrier Comfort Network
• Energy management module (EMM)
Refer to Controls, Start-up, Operation, Service, and
Troubleshooting literature and separate accessory installation
instructions for additional information.
30HXA LOW-AMBIENT OPERATION — If outdoor ambi-
ent operating temperatures below 60 F (15 C) are expected, refer
to separate 09DK condenser unit installation instructions for
Several optional con-
® (CCN) system
low-ambient operation using accessory Motormaster® V con-
trol minimum load accessories also required.
MINIMUM LOAD ACCESSORY — If minimum load ac-
cessory is required, use the appropriate package. Refer to unit
Price Pages or contact your local Carrier representative
for more details. For installation details, refer to separate
installation instructions supplied with the accessory package.
MISCELLANEOUS ACCESSORIES — For applications re-
quiring special accessories, the following packages are avail-
able: control power transformer, sound reduction enclosure,
sound blanket, external vibration isolation, expanded display,
and temperature reset sensor. Refer to individual accessory
installation instructions for installation details.
Step 6 — Leak Test Unit —
Swage-Lok fittings used on the refrigerant piping. If a leak is
detected at any of these fittings, tighten outside nut
DO NOT OVERTIGHTEN THESE FITTINGS. Over-
tightening will result in the tube being crushed and will
cause a refrigerant system leak.
There are several O-ring face seal fittings used in the
refrigerant and lubrication piping. If a leak is detected at any of
these fittings, tighten the O-ring face seal nut to 85 to 118 in.-lb
(9.5 to 12.4 Nm). Always use a back up wrench when tighten-
ing the O-ring face seal nut.
30HXC UNITS — These units are shipped from the factory
with a full charge of R-134a or a nitrogen holding charge (see
Tables 1A and 1B). Perform a leak test to ensure that leaks
have not developed during unit shipment. Dehydration of the
system is not required unless the entire refrigerant charge has
been lost.
30HXA UNITS — These units are shipped with a holding
charge of R-134a or nitrogen. Leak test and dehydrate the com-
plete system (including both field and factory-installed piping).
NOTE: Proper dehydration of 30HXA units is important to
ensure that no moisture is left in the system. Refer to the
separate section on Evacuation and Dehydration on page 23.
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CAUTION
Instructions continued on page 40.