Carrier 50SX024-060, 50SS018-060 owner manual Pre-Start-Up, Tran

LEGEND

CÐ Contactor, Compressor COM Ð Common

CTD	Ð	Compressor Time Delay
FU	Ð	Fuse
HR	Ð	Heater Relay
ICM	Ð	Integrated Control Motor
IFO	Ð	Indoor Fan On
PL	Ð	Plug
TRAN	Ð	Transformer
		Field Splice
		Terminal (Marked)

Terminal (Unmarked)

Terminal Block

Splice

Factory Wiring Field Control Wiring Field Power Wiring Accessory or Optional Wiring

To Indicate Common Potential Only. Not to Represent Wiring

Fig. 34 Ð Unit 50SX048,060 Ð 208/230-3-60 Integrated Control Motor Wiring Schematic

PRE-START-UP

Failure to observe the following warnings could result in serious personal injury:

1.Follow recognized safety practices and wear protec- tive goggles when checking or servicing refrigerant system.

2.Do not operate compressor or provide any electric power to unit unless compressor terminal cover is in place and secured.

3.Do not remove compressor terminal cover until all electrical sources are disconnected.

4.Relieve all pressure from both high- and low- pressure sides of the system before touching or dis- turbing anything inside terminal box if refrigerant leak is suspected around compressor terminals. Use ac- cepted methods to recover refrigerant.

5.Never attempt to repair soldered connection while re- frigerant system is under pressure.

6.Do not use torch to remove any component. System contains oil and refrigerant under pressure. To re- move a component, wear protective goggles and pro- ceed as follows:

a.Shut off electrical power to unit.

b.Relieve all pressure from system using both high- and low-pressure ports. Use accepted methods to recover refrigerant.

c.Cut component connecting tubing with tubing cut- ter and remove component from unit.

d.Carefully unsweat remaining tubing stubs when necessary. Oil can ignite when exposed to torch ¯ame.

Use the Start-Up Checklist supplied at the end of this book and proceed as follows to inspect and prepare the unit for initial start-up:

1.Remove all access panels.

2.Read and follow instructions on all WARNING, CAU- TION, and INFORMATION labels attached to, or shipped with, unit.

Make the following inspections:

a.Inspect for shipping and handling damages such as bro- ken lines, loose parts, disconnected wires, etc.

b.Inspect for oil at all refrigerant tubing connections and on unit base. Detecting oil generally indicates a re- frigerant leak. Leak-test all refrigerant tubing connec- tions using electronic leak detector, or liquid-soap so- lution. If a refrigerant leak is detected, see following Check for Refrigerant Leaks section.

c.Inspect all ®eld- and factory-wiring connections. Be sure that connections are completed and tight.

d.Inspect coil ®ns. If damaged during shipping and han- dling, carefully straighten ®ns with a ®n comb.

3.Verify the following conditions:

a.Make sure that outdoor-fan blade is correctly posi- tioned in fan ori®ce. Leading edge of blade should be 2 in. back from condenser inlet grille or 1¤2 in. maxi- mum from fan deck.

b.Make sure that air ®lter(s) is in place.

c.Make sure that condensate drain pan and trap are filled with water to ensure proper drainage.

d.Make sure that all tools and miscellaneous loose parts have been removed.

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