159
Table 12 — Default Settings for Sensorless Control — Setup 1
SERVICE OPTIONS
Two accessories are available to aid in servicing 30XA units: a
ground fault convenience outlet (GFI-CO) and a remote service
port.
The GFI-CO is a convenience outlet with a 4-amp GFI receptacle.
The remote service port is housed in a weather-proof enclosure
with a communication port to plug in the Navigator™ device.
Contact your local Carrier representative for more details. For in-
stallation details, refer to separate installation instructions supplied
with each accessory package.
Step 7 — Leak Test Unit
The 30XA units are shipped with a complete operating charge of
R-134a (see Tables 1A and 1B) and should be under sufficient
pressure to conduct a leak test.
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. There are several O-
ring face seal fittings utilized in the oil line piping. If a leak is de-
tected at any of these fittings, open the system and inspect the O-
ring surface for foreign matter or damage. Do not reuse O-rings.
Repair any leak found following good refrigeration practice.
Step 8 — Refrigerant Charging
DEHYDRATION
Refer to Carrier Standard Service Techniques Manual, Chapter 1,
Refrigerants, Sections 6 and 7 for details. Do not use compressor
to evacuate system.
REFRIGERANT CHARGE
The liquid charging method is recommended for complete
charging or when additional charge is required.
The 30XA units are shipped from the factory with a full charge
of R-134a. The unit should not need to be charged at installation
unless a leak was detected in Step 7 — Leak Test Unit section. If
dehydration and recharging is necessary, use industry standard
practices or refer to Carrier Standard Service Techniques Manual
as required.
Step 9 — Optional BACnet
1
Communication Wiring
The BACnet communication option uses the UPC Open control-
ler. The controller communicates using BACnet on an MS/TP net-
work segment communications at 9600 bps, 19.2 kbps, 38.4 kbps,
or 76.8 kbps. The UPC Open controller is mounted in a separate
enclosure below the main control box.
Wire the controllers on an MS/TP network segment in a daisy-
chain configuration. Wire specifications for the cable are 22 AWG
(American Wire Gage) or 24 AWG, low-capacitance, twisted,
stranded, shielded copper wire. The maximum length is 2000 ft.
Install a BT485 terminator on the first and last controller on a net-
work segment to add bias and prevent signal distortions due to
echoing. See Fig. 61-63.
SINGLE PUMP
Unit Size (tons) 90,100,110,120 140,160
Pump 4380 3x3x6 4380 3x3x6
HP 5 7.5 10 15 5 7.5 10 15
Impeller Dia (inches) 4.5 5 5.4 6.1 4.5 5 5.4 6.1
20-21 Setpoint 1 Hd ft wc 40 50 90 120 35 45 80 115
22-89 Flow at Design Point gpm 250 340
22-87 Press at No Flow Speed 40% Hd ft wc 16 20 36 48 14 18 32 46
DUAL PUMP
Unit Size (tons) 80,90,100,110,120 140,160
Pump 4382 4x4x6 4382 4x4x6
HP 5 7.5 10 15 5 7.5 10 15
Impeller Dia (inches) 4.5 5 5.4 6.1 4.5 5 5.4 6.1
20-21 Setpoint 1 Hd ft wc 40 50 90 120 35 45 80 115
22-89 Flow at Design Point gpm 250
340
22-87 Press at No Flow Speed 40% Hd ft wc 16 20 36 48 14 18 32 46
IMPORTANT: These units are designed for use with R-
134a only. DO NOT USE ANY OTHER refrigerant in
these units.
CAUTION
DO NOT OVERTIGHTEN THESE FITTINGS. Overtighten-
ing will result in O-ring damage.
IMPORTANT: These units are designed for use with R-134a
only. DO NOT USE ANY OTHER refrigerant in these units.
CAUTION
When charging, circulate water through the cooler at all times
to prevent freezing. Freezing damage is considered abuse and
may void the Carrier warranty.
CAUTION
DO NOT OVERCHARGE system. Overcharging results in
higher discharge pressure with higher cooling fluid consump-
tion, possible compressor damage, and higher power con-
sumption.
1. BACnet is a registered trademark of ASHRAE (American Society of
Heating, Refrigerating, and Air-Conditioning Engineers).
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