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Mixing valve installation

Set the position.
Fit. Connect.

Start with the valve on the right: unnotched side down, actuator fully left at 0%, CW mode. Fit them together, then connect the cable. The left-hand layout mirrors this setup.

Start here
Brass mixing valve with three spindle notches, beside its grey actuator with red manual lever
Valve and actuator · component identification
01 · Position the valve02 · Position the actuator03 · Connect to the plant controller
01 / Position the valve

Start with the unnotched side down.

Turn the valve spindle so its three notches point up, left and right. The side with no notch points down, toward the source inlet. This is 0%: maximum recirculation.

Three-notch spindle, enlargedFront view of the photographed spindle: three radial notches, one at the top and one on each side. The bottom has no notch. This is the zero-percent starting position: the unnotched side points down toward the source inlet.
0% starting position · no notch at the bottom.

Read it from the front.

Look straight at the exposed spindle. Keep the room loop above and the source supply and return below.

Keep this valve position while fitting the actuator. For the first setup below, the valve is on the right and the actuator turns clockwise as the command increases.

CW ↻ / CCW ↺ · both setups

Watch the valve and spindle move.

Watch the valve turn and compare the view looking into each port.

Right-hand valve opening from zero to full The animation alternates layouts until a direction is selected, then repeats that layout from zero to one hundred percent without reverse playback. Source water is amber and loop-return water is blue. At zero only loop return recirculates; as the valve opens, source flow increases and recirculation decreases. The same translucent internal mechanism appears on the valve and in the enlarged view, with the same orientation: outlet up, source below, return at the side. Ports are A source below, B bypass at the side and C output above. A brass-centred rotor with one broad black blocking segment and two smaller opposite segments controls the source and return inlets. ROOM LOOP C · Output B · Bypass Pump DS18B20 Ceiling/floor source probe Return ↓A · Source ↑ HEATING / COOLING SOURCE VALVE ON THE RIGHTCW ↻ VALVE ON THE LEFTCCW ↺ Select a direction to keep repeating it. INSIDE THE VALVE Same orientation · enlarged A — Source, looking into the actual valve Source closed Actuator below · CW · 0% command A · Source B — Bypass, looking into the actual valve Bypass open Actuator below · CW · 0% command B · Bypass C — Output, looking into the actual valve Bypass to output Actuator below · CW · 0% command C · Output Deflector on source (A) Source closed · return open VALVE COMMAND · Vout 0% 0.0 V Source water Loop return
02 / Position the actuator

Use the manual-release button.

Press and hold the button on the actuator’s left side to release the drive, then move the lever to the starting position. Release the button to restore motor operation.

Actuator manual-release buttonPress and hold the button on the left side of the actuator while moving the lever by hand. Release the button to restore motor operation. Press and holdthe left-side button
03 / Connect the cable

Three wires to run. Feedback is optional.

With power isolated, connect the pictured actuator to Ceiling mixing or Floor mixing on the plant controller. This example uses its 24 V DC wiring.

Pictured actuator: 24 V DC wiring to the actual plant controllerExample uses the Ceiling mixing block. Brown goes to 24 V, black to 0 V, yellow to Vout, and optional white feedback to Vin. The blue AC supply wire is separately insulated. Floor uses its own adjacent block with the same contact order. Controller → rotary actuator24 V DC example · Ceiling mixing block Magnified board contacts BR+24 VBK0 VYVoutWVin BL · blueInsulate in DC use ControlFeedback Dashed white = optional feedback. Same contact order on the Floor mixing block.
Pictured actuator · 24 V DC connection
Actuator leadController contactWhat it does
Brown · BR24 VPositive DC supply
Black · BK / COM0 VDC and signal common
Yellow · Y / inputVout 0–10 VCommand: board → actuator
White · W / FBVin 0–10 V · optionalFeedback: actuator → board
Blue · BLNot connected in DC useAC supply lead; insulate separately

Insulate the unused blue lead separately. If feedback is not fitted, also insulate the white lead and leave Vin empty. Match the colours to the label on the fitted actuator.

One final check.

On the leader, open Test mixing valves. Check the fitted circuit at 0%: maximum recirculation, then 100%: maximum source flow. Allow the actuator to finish moving, then select Exit test to restore automatic control.

Entering the mixing test initially commands both mixing valves to 0%. Repeat the fitting sequence for the other circuit.

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