Carrier 17, 19EX installation instructions Ð Relief Valve Locations and Data

Insulate Motor Terminals and Lead Wire Ends Ð Insulate compressor motor terminals, lead wire ends, and electrical wires to prevent moisture condensation and electrical arc- ing. For low-voltage units (up to 600 v), insulate the elec- trical terminals as follows:

1.Insulate each terminal by wrapping with one layer of insulation putty.

2.Overwrap putty with 4 layers of vinyl tape.

High-voltage units require special terminal preparation. The vinyl tape is not acceptable; a high voltage tape must be used. Installer is responsible for any damage caused by improper wiring between starter and compressor motor.

Connect Power Wires to Oil Pump Contactor Ð Connect power wires to oil pump contactor mounted in machine power panel. (See Fig. 19.) Use the electrical disconnect located in the machine starter (if supplied), or a separate fused disconnect as shown on job wiring diagrams. Check that power supply voltage agrees with oil pump voltage. Follow correct phas- ing for proper motor rotation.

Do not wire into the top surface of the power panel. Knock- outs are provided on the underside of the panel.

Connect Power Wires to Oil Heater Contactor Ð Connect control power wiring between the oil heater contactor ter- minals (Fig. 17 and 18) and terminals LL1 and LL2 on the ®eld wiring strip in the compressor motor starter. Refer to Fig. 21 and wiring label on the chiller power panel.

Voltage to terminals LL1 and LL2 comes from a con- trol transformer in a starter built to Carrier speci®ca- tions. Do not connect an outside source of control power to the compressor motor starter (terminals LL1 and LL2). An outside power source will produce dangerous volt- age at the line side of the starter, because supplying volt- age at the transformer secondary terminals produces in- put level voltage at the transformer primary terminals.

Connect Communication and Control Wiring from Starter to Power Panel Ð Connect control wiring from main motor starter to the chiller power panel. All control wiring must use shielded cable. Also connect the communications cable. Make sure the control circuit is grounded in accordance with applicable electrical codes and instructions on chiller control wiring label.

Table 13 Ð Relief Valve Locations and Data

RELIEF VALVE	HEAT EXCHANGER		REQUIRED C FACTOR		NOMINAL OUTLET	NUMBER OF	RATED RELIEF
		SIZE					PRESSURE
LOCATION					PIPE SIZE (in.)	VALVES
	Cooler	Condenser	lb air/min.	kg air/sec.			psig	kPa
	31-33	31-33	139.7	1.06	11¤4 FPT	2	225	1551
	41-43	41-43	158.8	1.20	11¤4 FPT	2	225	1551
Cooler	44	51-53	164.6	1.24	11¤4 FPT	2	225	1551
	45-47	45-47	216.3	1.64	11¤4 FPT	3	225	1551
	48	55-57	228.5	1.73	11¤4 NPT	3	225	1551
Economizer/Storage	41-44	ALL	64.2	0.49	11¤4 NPT	2*	225	1551
Vessel	45-48	ALL	84.3	0.64	11¤4 FPT	2*	225	1551
Pumpout Unit Condenser	ALL	ALL	1.5	0.01	3¤8 in. Male Flare MPT	1	385	2655

*To ensure relief valve serviceability, and as required in ASHRAE 15, latest edition, three-way valves and redundant relief valves are in- stalled on the storage vessel. Only one half of the ``No. of Valves'' listed are in service at any time.

NOTES:

1.The cooler relief C-factor is for both cooler and condenser vented through the cooler in accordance with ASHRAE (American Society of Heating, Refrigeration, and Air Conditioning Engi- neers) 15, latest edition.

2.Relief valve discharge pipe sizing is to be calculated per latest version of ASHRAE 15, using the tabulated C-factors and nom- inal pipe size listed above. Cooler and economizer/storage ves- sel rated relief valve pressure is 225 psig (1551 kPa).

3.The pumpout unit condenser contains less than 110 lb (50 kg) of HFC-134a, which is a Group A1 refrigerant. The ASHRAE 15 stand- ard exempts small-volume vessels from the requirement to vent outside. However, Carrier recommends that the pumpout con- denser be connected to the rest of the vent system.

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