Carrier 50RLP installation instructions Legend For Fig, Loop Water Flow Switch LED Display

ALLSYS — System

BLRL1 — Heat Source 1 Speed/Level BLRL2 — Heat Source 2 Speed/Level

CB — Circuit Breaker

CTL1 — Cooling Tower 1 Speed/Level

CTL2 — Cooling Tower 2 Speed/Level FLOW — Loop Water Flow

OVRIZ1 — Override Input for Zone 1 OVRIZ2 — Override Input for Zone 2 OVRIZ3 — Override Input for Zone 3 OVRIZ4 — Override Input for Zone 4 OVRIZ5 — Override Input for Zone 5 OVRIZ6 — Override Input for Zone 6 OVRIZ7 — Override Input for Zone 7 OVRIZ8 — Override Input for Zone 8 OVRIZ9 — Override Input for Zone 9 OVRIZ10 — Override Input for Zone 10 OVRIZ11 — Override Input for Zone 11

LEGEND FOR FIG. 8

OVRIZ12 — Override Input for Zone 12 OVRIZ13 — Override Input for Zone 13 OVRIZ14 — Override Input for Zone 14 OVRIZ15 — Override Input for Zone 15 OVRIZ16 — Override Input for Zone 16 OVRIZ17 — Override Input for Zone 17 OVRIZ18 — Override Input for Zone 18

PCB — Comfort Controller Circuit Board PUMP1 — Pump Number 1

PUMP2 — Pump Number 2 RMTOCC — Remote Occupied Mode

SDP — System Differential Pressure SRWT — System Return Water Temperature SSWT — System Supply Water Temperature SYSZ1 — System for Zone 1

SYSZ2 — System for Zone 2 SYSZ3 — System for Zone 3 SYSZ4 — System for Zone 4

SYSZ5 — System for Zone 5

SYSZ6 — System for Zone 6

SYSZ7 — System for Zone 7

SYSZ8 — System for Zone 8

SYSZ9 — System for Zone 9

SYSZ10 — System for Zone 10

SYSZ11 — System for Zone 11

SYSZ12 — System for Zone 12

SYSZ13 — System for Zone 13

SYSZ14 — System for Zone 14

SYSZ15 — System for Zone 15

SYSZ16 — System for Zone 16

SYSZ17 — System for Zone 17

SYSZ18 — System for Zone 18

T— Transformer

TB — Terminal Block

TBP — Terminal Block or Pin Connector

Install Thermostat, Sensors and Switches — In all installations, the loop supply water temperature sensor and water flow switch must be installed in the field. The water pressure sensor is used to sense water system pressure to operate in conjunction with pump variable frequency drives. A thermostat is used in stand-alone systems. A space tempera- ture sensor is used in conjunction with water source heat pumps provided with PremierLink™ controllers. Refer to the accessory installation instructions literature provided with each accessory that is used for accessory installation instructions.

NOTE: All thermostats, sensors, and switches are field- installed accessories.

Install Loop Water Supply and Return Tem- perature Sensors — Install the water loop supply sen- sor in the main water supply, located before the water source heat pumps. Install the water loop return sensor in the return water piping from the water source heat pumps. The sensors must be inserted fully into an immersion well (provided). Seal immersion well threads with tape and install into pipe tee or re- ducing fitting. The well screws into a 1/2-in. NPT saddle (or Thredolet fitting) furnished by the installing contractor. Screw the sensor into the well via the 1/8-in. NPT brass fitting. Termi- nate wiring with butt splice or soldering. Wire nuts are not rec- ommended. Use full 8 ft of lead length provided to avoid mois- ture migration up the wire. Wire the supply sensor to terminals SSWT. Wire the return sensor to terminals SRWT. See Fig. 8. Sensors may be located in any position in relationship to the main supply line. Use shield cable to protect from any electri- cal interference.

Install Loop Water Pressure Sensor — Install the pressure sensor on the discharge side of the circulating pump(s) in a common supply main so that total system pressure rather than individual pump(s) flow is detected. The pressure sensor must be placed in a vertical position and must match the actual water flow direction with flow switch direction indicators. Seal the switch fitting with Teflon tape and insert in a 1/4-in.

standard pipe tee (Thredolet fitting) or reducing fitting, with at least three pipe diameters straight run upstream and down- stream of the switch. Wire sensor to terminals SDP. See Fig. 8.

Install Loop Water Flow Switch — Install the loop water flow switch on the discharge side of the circulating pump(s) in a common supply main so that total system flow rather than individual pump(s) flow is detected. The flow switch must be placed in a vertical position and must match the actual water flow direction with flow switches direction indica- tors. Seal the switch fitting with Teflon tape and insert in a stan- dard pipe tee or reducing fitting, with at least three pipe diame- ters straight run upstream and downstream of the switch.

Electrical connection can be made to the switch. Two wires should be run to the switch for 24 VAC power. The switch is supplied with wire leads for connection to the FLOW terminal. When power is supplied to the device, a warm-up period is initiated. During this period, the right green LED will be lit. Each LED to the left is successively lit until the farthest left red LED is lit. Each LED will be turned off when the next is lit. The warm-up period may take up to 30 seconds.

When flow is detected, a red LED at the far left will be lit. With increasing flow, successive red LEDs will be lit. When the switch determines sufficient flow is present, the amber LED lights indicating the output has closed. This is not an indi- cation of minimum flow. As flow increases, the first green LED will be lit. Each successive green LED indicates greater flow. The switch closure does not indicate minimum flow for the machine. With one green LED lit, minor fluctuations in water flow may cause nuisance alarms. Additional green LEDs indicate higher flow rates, and can avoid the nuisance alarms. The switch is calibrated to light the amber LED at a fluid velocity of 0.8 ft/sec (0.24 m/sec). The flow rate will depend on the nozzle size. See Table 4. See Table 5 for Water Flow Switch Troubleshooting. If the water flow switch is not work- ing correctly, refer to Table 5.

Table 4 — Loop Water Flow Switch LED Display

SIZE		SCHEDULE 40 PIPE
	O.D. (in.)	Wall Thickness (in.)	I.D. (in.)	Area (Ft2)	GPM
4	4.5	.237	4.026	0.09	32
5	5.563	.258	5.047	0.14	50
6	6.625	.28	6.065	0.20	72
8	8.625	.322	7.981	0.35	125

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