o[]D
LEN CCN
(+) (COM) (-) SHIELD
oE3E3
LEN CCN
LEGEND
CCN -- Carrier Comfort Network®
LEN -- Local Equipment Network
Fig. 51 -- TB-3 -- CCN Wiring
TO NEXT
DEVICE
Step 6 -- Install Accessories --A number of
accessories are available to provide the tbtlowing optional fea-
tures (for details, refer to the Controls and Troubleshooting
guide).
Enerw Managelnent Module is used tbr any of the follow-
ing types of temperature reset, demand limit and ice features:
• 4 to 20 mA inputs for cooling set point reset and capacity
limit (requires field-supplied 4 to 20 mA generator)
• 0 to 10 v output for percentage total capacity running
• 24 v discrete outputs for shutdown and running relays
• 10k space telnperamre input
• Discrete inputs t\_r occupancy override, demand limit
switch 2 (step 1 demand limit is wired to the base board,
requires field-supplied dry contacts), remote lockout
switch and ice done switch (requires field-supplied dry
contacts)
NAVIGATOR TM DISPLAY Provides hand-held, mobile
capability using easy to read 4-line display. Keypad function is
the stone as the Scrolling Marquee display. The Navigator
display t_atures a mounting magnet for 'hands fiee' service of
COlnponents.
REMOTE ENHANCED DISPLAY For applications where
relnote monitoring of the equipment is required; the Relnote
Enhanced Display provides an indoor display, capable of
monitoring any equipment on the Carrier Comfort Network
(CCN) bus. A CCN bus is needed.
LOW AMBIENT TEMPERATURE OPERATION It"
outdoor ambient operating temperatures below 32 F (0° C) are
expected, refer to separate installation instructions for low mn-
bient telnperature operation using the low alnbient temperature
head pressure control accessory.
MINIMUM LOAD ACCESSORY If minimum load acces-
sory is required, contact your local Carrier representative for
more details. For installation details, refer to separate installa-
tion instructions supplied with the accessory package.
UNIT SECURITY/PROTECTION ACCESSORIES For
applications with unique security and/or protection require-
ments, several options are available for unit protection.
Compressor enclosures, security _illes and hail guards are
available. Contact your local Carrier representative for more
details. For installation details, refer to separate installation
instructions supplied with the accessory package.
COMMUNICATION ACCESSORIES A number of com-
munication options are available to meet any requirement.
Contact your local Carrier representative for lnore details. For
installation details, refer to separate installation instructions
supplied with the accessory package.
SERVICE OPTIONS Two additional accessories are offered
to aid in servicing 30RB units. A mound thult convenience
outlet (GFI-CO), a remote service port, is a weather-proof
enclosure with a colrnnunication port to plug-in the Navigator
device, are available. Contact your local Can-ier representative
for more details. For installation details, ret_r to separate instal-
lation instructions supplied with the accessory package.
Step 7 -- Refrigerant Circuit
LEAK TESTING Units are shipped with complete operat-
ing charge of R-410A (see Tables 2A-3B) and should be uMer
sufficient pressure to conduct a leak test.
This system uses Puron&) R-410a refi-igerant, which has
higher pressures than R-22 and other ret}igerants. No other
refi-igerant can be used in this system. Failure to use gage
set, hoses, and recovery systems designed to handle Puron
R-410a refi-igerant may result in equipment dmnage or per-
sonat injury. If unsure about equipment, consuh the equip-
ment manuthcturer.
Perform a leak test to ensure that leaks have not developed
during unit shipment. Dehydration of the system is not required
unless the entire refi-igerant chaNe has been lost. Compressor
oil equalization line fittings use Roto-lok fittings. If a leak is
detected at these fittings, tighten fitting 49.0 ft-tb. If leak
persists, open system and inspect the gasket surface for foreiml
material or damage. Do not reuse gaskets. Repair any leak
found using good refi-igeration practice.
DEHYDRATION Refer to Carrier Standard Service Tech-
niques Manual, Chapter 1, Refi-igerants, Sections 6 and 7 for
details. Do not use compressor to evacuate system.
REFRIGERANT CHARGE (Refer to Tables 2A-3B)
Ilrnnediately allead of filter drier in each circuit is a thctory-
installed liquid line service vane. Each valve has a l/4-in.
Schiader connection tbr charging liquid refiigerant.
When chalging, circulate water through the cooler at all
times to prevent fieezing. Freezing damage is considered
abuse and may void the Carrier warranty.
DO NOT OVERCHARGE system. Overchaiging results
in higher dischaNe pressure possible compressor damage,
aaldhigher power consumption.
Refi-igerant chaNe must be removed slowly to prevent loss
of compressor oil that could result in compressor failure.
54
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