Carrier 17EX Carrier Comfort Network Interface , Check Starter

Table 7 — Recommended Compressor and

External Gear Fastener Tightening Torques

FASTENER

DIAMETER (in.) TORQUE*

Lb.-Ft. (N•m)

UNC Minimum Maximum

⁄

7 (9.5) 9 (12.2)

⁄

14 (19.0) 17 (23.1)

⁄

25 (33.9) 31 (42.0)

⁄

40 (54.2) 50 (67.8)

⁄

60 (81.4) 75 (101.7)

⁄

87 (118.0) 108 (137.0)

⁄

120 (162.7) 150 (203.4)

⁄

213 (288.8) 266 (360.7)

⁄

343 (465.1) 429 (581.7)

1515 (698.3) 643 (871.9)

⁄

635 (861.1) 793 (1075.3)

⁄

896 (1215.0) 1120 (1518.7)

⁄

1175 (1593.3) 1468 (1990.6)

⁄

1560 (2115.4) 1950 (2644.2)

⁄

1828 (2478.8) 2286 (3099.8)

22750 (3729.0) 3437 (4660.6)

⁄

4022 (5453.8) 5027 (6816.6)

⁄

5500 (7458.6) 6875 (9322.5)

⁄

7456 (10,110.3) 9323 (12,642.0)

*Dry fastener.

NOTE: The torque values listed are to be used for end covers, seal

cages, shaft guards, inspection covers, and housing split line bolts,

unless otherwise speciﬁed on the drawing or assembly instructions.

Carrier Comfort Network Interface — The Carrier

Comfort Network (CCN) communication bus wiring is sup-

plied and installed by the electrical contractor. It consists of

shielded, 3-conductor cable with drain wire.

The system elements are connected to the communication

bus in a daisy chain arrangement. The positive pin of each

system element communication connector must be wired to

the positive pins of the system element on either side of it;

the negative pins must be wired to the negative pins; the sig-

nal ground pins must be wired to signal ground pins.

To attach the CCN communication bus wiring, refer to

the certiﬁed drawings and wiring diagrams. The wire is in-

serted into the CCN communications plug (COMM1) on the

PSIO module. This plug also is referred to as J5.

NOTE: Conductors and drain wire must be 20AWG (Ameri-

can Wire Gage) minimum stranded, tinned copper. Indi-

vidual conductors must be insulated with PVC, PVC/nylon,

vinyl, Teﬂon, or polyethylene.An aluminum/polyester 100%

foil shield and an outer jacket of PVC, PVC/nylon, chrome

vinyl, or Teﬂon with a minimum operating temperature range

of –20 C to 60 C is required. See table below for cables that

meet the requirements.

MANUFACTURER CABLE NO.

Alpha 2413 or 5463

American A22503

Belden 8772

Columbia 02525

When connecting the CCN communication bus to a sys-

tem element, a color code system for the entire network is

recommended to simplify installation and checkout. The fol-

lowing color code is recommended:

SIGNAL

TYPE CCN BUS CONDUCTOR

INSULATION COLOR PSIO MODULE

COMM 1 PLUG (J5) PIN NO.

+RED 1

Ground WHITE 2

–BLACK 3

Check Starter

BE AWARE that certain automatic start arrangements

can engage the starter. Open the disconnect ahead of

the starter in addition to shutting off the chiller and pump.

Use the instruction and service manual supplied by the

starter manufacturer to verify that the starter has been in-

stalled correctly.

The main disconnect on the starter front panel may not

deenergize all internal circuits. Open all internal and re-

mote disconnects before servicing the starter.

Whenever a starter safety trip device activates, wait at least

30 seconds before resetting the safety. The microprocessor

maintains its output to the 1CR relay for 10 seconds after

starter safety shutdown to determine the fault mode of

failure.

MECHANICAL STARTERS

1. Check all ﬁeld wiring connections for tightness, clear-

ance from moving parts, and correct connection.

2. Check the contactor(s) to be sure they move freely. Check

the mechanical interlock between contactors to ensure that

the 1S and 2M contactors cannot be closed at the same

time. Check all other electro-mechanical devices, such as

relays and timers, for free movement. If the devices do

not move freely, contact the starter manufacturer for re-

placement components.

3. Some dashpot-type magnetic overload relays must be filled

with oil at the jobsite. If the starter is equipped with de-

vices of this type, remove the ﬂuid cups from these mag-

netic overload relays. Add dashpot oil to the cups per in-

structions supplied with the starter. The oil is usually shipped

in a small container attached to the starter frame near the

relays. Use only dashpot oil supplied with the starter. Do

not substitute.

Factory-ﬁlled dashpot overload relays need no oil at start-

up, and solid-state overload relays do not have oil.

4. Reapply starter control power (not main chiller power)to

check the electrical functions. When using a reduced-

voltage starter (such as a wye-delta starter) check the tran-

sition timer for proper setting. The factory setting is

30 seconds (±5 seconds), timed closing. The timer is ad-

justable in a range between 0 and 60 seconds, and set-

tings other than the nominal 30 seconds may be chosen

as needed (typically 20 to 30 seconds).

When the timer has been set, check that the starter (with

relay 1CR closed) goes through a complete and proper

start cycle.

SOLID-STATE STARTERS

The solid-state starter is at line voltage when AC power

is connected. Pressing the Stop button does not remove

voltage. Use caution when adjusting the potentiometers

on the equipment.