Carrier 50RLP installation instructions Typical Stand-AloneWSHP System

EXPANSION

COOLINGTANK

TOWER

AIR SEPARATOR

PUMP

BOILER

WSHP

FLOW

SENSOR

TEMP.

SENSOR

T-STAT

AQUAZONE

SYSTEM

CONTROL

PANEL

LEGEND

Control Wiring

Loop Water Piping

Fig. 2 — Typical Stand-Alone WSHP System

WSHP

WSHP

WSHP

T-STAT

T-STAT

T-STAT

If variable frequency drives are utilized for system pumps, no pump control relays are specified. Each relay contains a red light-emitting diode (LED), which indicates the relay coil is energized. The pump control relays are located in the upper left hand corner of the system control panel. See Fig. 4. Wiring is shown in Fig. 5A-5C. Specifications for the pump control relays are as follows:

Voltage Input:	24 vdc @ 15 mA, 14 vac @ 30 mA,
	115 vac @ 20 mA, 230 vac
	@ 20 mA.
Contact Rating:	10 A res. @ 115 vac,
	7 A res. @ 230 vac/28 vdc,
	N.O.: 1/6 hp @ 115 vac.
Temperature Range: –60 F to 185 F
Indication:	LED
Enclosure:	18 ga. metal back
Dimensions:	5.125-in. x 3.125-in. x 2.5-in.
	(HxWxD) or 5.125-in. x 9.5-in. x
	2.5-in. (HxWxD)

OUTPUT TRANSDUCERS — For both stand-alone and CCN systems (based on the stages of heat addition or rejection required) the Aquazone™ system control panel can be ordered with a combination of 2-stage and 4-stage output transducers to provide 2, 4, 6, or 8 stages. The combination desired is speci- fied in the 50RLP model nomenclature in digit 6 to specify heat rejection stages and digit 7 to specify heat addition stages. See Fig. 1. If variable speed cooling tower fan operation and/or

modulating valve operation for steam or water are utilized, no output transducer card is specified. The output transducer is a solid-state multi-stage device used for staging control from a single analog signal. Output transducers are located in the upper left hand corner of the Aquazone System Control Panel underneath the pump control relays. See Fig. 4. Specifications for the pump control relays are as follows:

Supply Voltage:	24 vac ± 10% @ 100 mA,
	24 vdc ± 10% @ 50 mA
Input Signal:	4-20 mA
Output:	2 SPDT relays for 2-stage,
	4 SPDT relays for 4-stage.
Relay rating:	5A @ 120 vac
Accuracy & repeatability:	± 1%
Set point adjustment:	25-turn potentiometers
Input impedance:	250 W (mA input), 10 kW
	(V input)
Temperature Range:	32 F to 158 F
Humidity Limit:	5 to 95% relative humidity
	non-condensing
Dimensions:	3.25-in. x 3.5-in. x 1.375-in.
	(HxWxD) for 2-stage, 3.25-in. x
	5.5-in. x 1.375-in. (HxWxD)
	for 4-stage
Relay Differential:	0.5 mA or 0.375 V.

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