Carrier 17EX specifications Check Starter, Mechanical Starters, SOLID-STATE Starters

Table 7 Ð Recommended Compressor and External Gear Fastener Tightening Torques

FASTENER		TORQUE*
DIAMETER (in.)		Lb.-Ft. (N · m)
UNC	Minimum		Maximum
1¤4	7	(9.5)	9	(12.2)
5¤16	14	(19.0)	17	(23.1)
3¤8	25	(33.9)	31	(42.0)
7¤16	40	(54.2)	50	(67.8)
1¤2	60	(81.4)	75	(101.7)
9¤16	87	(118.0)	108	(137.0)
5¤8	120	(162.7)	150	(203.4)
3¤4	213	(288.8)	266	(360.7)
7¤8	343	(465.1)	429	(581.7)
1	515	(698.3)	643	(871.9)
11¤8	635	(861.1)	793	(1075.3)
11¤4	896	(1215.0)	1120	(1518.7)
13¤8	1175	(1593.3)	1468	(1990.6)
11¤2	1560	(2115.4)	1950	(2644.2)
13¤4	1828	(2478.8)	2286	(3099.8)
2	2750	(3729.0)	3437	(4660.6)
21¤4	4022	(5453.8)	5027	(6816.6)
21¤2	5500	(7458.6)	6875	(9322.5)
23¤4	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 speci®ed on the drawing or assembly instructions.

Carrier Comfort Network Interface Ð 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 certi®ed 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 20 AWG (Ameri- can Wire Gage) minimum stranded, tinned copper. Indi- vidual conductors must be insulated with PVC, PVC/nylon, vinyl, Te¯on, or polyethylene. An aluminum/polyester 100% foil shield and an outer jacket of PVC, PVC/nylon, chrome vinyl, or Te¯on 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	CCN BUS CONDUCTOR	PSIO MODULE
TYPE	INSULATION COLOR	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 ®eld 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 ¯uid 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-®lled 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.

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