Carrier 50RHE006-060 specifications Low Voltage Wiring See Fig, Pre-Start-Up

Step 9 — Low Voltage Wiring (See Fig. 15)

THERMOSTAT CONNECTIONS — The thermostat should be wired directly to the Aquazone™ control board. See Fig. 9-12.

WATER FREEZE PROTECTION — The Aquazone control allows the field selection of source fluid freeze protection points through jumpers. The factory setting of jumper JW3 (FP1) is set for water at –1.1 C. In earth loop applications, jumper JW3 should be clipped to change the setting to –10.6 C when using antifreeze in colder earth loop applications. See Fig. 16.

AIR COIL FREEZE PROTECTION — The air coil freeze protection jumper JW2 (FP2) is factory set for –1.1 C and should not need adjusting.

ACCESSORY CONNECTIONS — Terminal A on the control is provided to control accessory devices such as water valves, electronic air cleaners, humidifiers, etc. This signal operates with the compressor terminal. See Fig. 17. Refer to the specific unit wiring schematic for details.

NOTE: The A terminal should only be used with 24-volt signals — not line voltage signals.

WATER SOLENOID VALVES — Water solenoid valves may be used on primary/secondary pump and ground water installa- tions. A typical well water control valve wiring approach, which can limit waste water in a lockout condition, is shown in Fig. 17. A slow closing valve may be required to prevent water hammer. When using a slow closing valve, consider special wiring conditions. The valve takes approximately 60 seconds to open (very little water will flow before 45 seconds) and it activates the compressor only after the valve is completely opened by closing its end switch. When wired as shown, the valve will have the following operating characteristics:

1.Remain open during a lockout

2.Draw approximately 25 to 35 VA through the “Y” signal of the thermostat.

IMPORTANT: Connecting a water solenoid valve can overheat the anticipators of electromechanical thermo- stats. Only use relay based electronic thermostats.

NOTE: Low voltage connector may be removed for easy installation.

Fig. 15 — Low Voltage Field Wiring

		BR BRG	CCG CC	Comp
							CLIP JW2-FP2
	C		Off On	Relay
							JUMPER FOR
		Test
							ANTI-FREEZE
						P2
					1		SYSTEMS
						HP
	R
CLIP JW3		JW3	FP1 Low Temp			HP
						LP
FOR		JW2	FP2 Low Temp
						LP
FREEZE						FP1
PROTECT	Y					FP1
						FP2
						FP2
	Y		Micro			RV
	W					RV
						CO
	O				12
						CO
	G
	R
	C			Status		P3
	AL1
		JW1-AL2 DRY		LED	1	24Vdc
	AL2
	A				4	EH1
	P1					EH2
CLIP		Alarm				CO
FOR DRY		Relay
CONTACT

AQUAZONE CONTROL (C Control Shown)

Fig. 16 — Typical Aquazone Control Board

Jumper Locations

Terminal Strip P2

C

Typical

24 VAC Water

Valve

A

Fig. 17 — Typical D Control Accessory Wiring

PRE-START-UP

System Checkout — When the installation is complete, follow the System Checkout procedure outlined below before starting up the system. Be sure:

1.Voltage is within the utilization range specifications of the unit compressor and fan motor and voltage is balanced for 3-phase units.

2.Fuses, breakers and wire are correct size.

3.Low voltage wiring is complete.

4.Piping and system flushing is complete.

5.Air is purged from closed loop system.

6.System is balanced as required. Monitor if necessary.

7.Isolation valves are open.

8.Water control valves or loop pumps are wired.

9.Condensate line is open and correctly pitched.

10.Transformer switched to lower voltage tap if necessary.

11.Blower rotates freely — shipping support is removed.

12.Blower speed is on correct setting.

13.Air filter is clean and in position.

14.Service/access panels are in place.

15.Return air temperature is between 4.4 to 26.7 C heating and 10 to 43.3 C cooling.

16.Air coil is clean.

17.Control field selected settings are correct.

16