Install Instructions

ManualsBrandsTaco ManualsHeating Supplies1/2" Geo-Sentry GeoThermal Zone Valve - Sweat, Normally Closed

valve stem into the actuator cavity, push in and hold the release

clip until the actuator slips over the valve locking posts (see

Figure D). Once the actuator is flush to the valve body, let go of

the release clip. Using very little force, try to take the actuator off

of the valve body without using the release clip. Both locking

posts should be firmly attached to the actuator. If the actuator

slides up the stem, repeat the assembly process.

3. Changing the actuator orientation: The actuator may be attached

to the valve body in either direction (see Figure A). In order to

reverse the actuator orientation on the valve body, see the actu-

ator removal instructions in Step 1 with the following exceptions.

Instead of moving the actuator the full

⁄

", move it just high

enough to clear the locking posts, rotate the actuator 180° and

reinstall it on the locking post by following the previous instruc-

tions for reassembling the actuator.

4. The plug-in quick connects can be disconnected from the valve

actuator for ease of wiring. Insert the corresponding wire into the

quick connects and tighten by turning the screw.

Mode of Operation:

1. Upon initial field installation the capacitor requires a full charge,

up to 35 seconds, before the valve starts to turn. Charging time

will vary (typically less) during normal operation.

2. When the capacitor is charging the green LED light will FLASH.

3. Once the capacitor is charged, the green LED will stop flashing

but remain ON. At this point the valve’s actuator will rotate the

ball valve. The green LED will remain ON as long as the ther-

mostat is calling (the unit is powered).

4. Once the thermostat is satisfied the green LED will turn OFF and

the valve will rotate 90° into its normal position or non-powered

position. For example: If the actuator is an NC (normally closed)

version, the actuator would open the valve when the thermostat

calls. Once the thermostat is satisfied the actuator would then

rotate the valve 90° to its normally closed position.

3-Way Valve Installation:

On hot water applications, the valve body may be installed in any

orientation. On chilled water installations, do not install with the

actuator beyond 85° from the topmost position (see Figure B).

1. Remove actuator from the valve body per previous instructions.

(See Actuator Installation / Wiring and Figure D).

2. Open the valve to the full open position of the first port to be

soldered (port A or B).

3. Clean and prepare the valve and pipe using the proper tech-

niques required prior to soldering.

4. Fit the valve into the piping system.

5. Solder the port of the valve that you placed in the full open posi-

tion, directing the flame away from the center of the valve.

6. Turn the opening of the valve to the second port to be soldered.

(the opposite port of the one just completed.)

7. Repeat step 5 for the second port.

8. Solder the third port (bottom port). This port is always in the full

open position.

9. Immediately cool the valve with a wet towel.

10. Reassemble actuator to the valve body per previous instruc-

tions. (See Actuator Installation / Wiring) and Typical

Installations for 3-Way Valves Figures E and F).

WARNING: Do not use zone valves on indirect

water heaters without a tempering device.

CAUTION: Do not jumper power/motor (24 VAC)

connection terminals, even temporarily. This may

cause damage to the thermostat’s heat anticipator.

Figure E: Typical Installations for 3-way Valves

Normally Closed to the Load

LOAD

SUPPLY

RETURN

FLOW ON

NO CALL

FLOW ON

NO CALL

FLOW ON

CALL

FLOW ON

CALL

ELECTRICAL

CONNECTION

ELECTRICAL

CONNECTION

Figure F: Typical Installations for 3-way Valves

Normally Open to the Load

LOAD

SUPPLY

SUPPLY RETURN

RETURN

FLOW ON

NO CALL

FLOW ON

NO CALL

FLOW ON

CALL

FLOW ON

CALL

LECTRICAL

CONNECTION

ELECTRICAL

CONNECTION

NOTE for 3-Way: The actuator’s electrical connections must

be mounted over the port that requires flow when power is

applied to the actuator. See Figures E and F.

Flow Coefficients and Maximum Close-Off Pressure:

* At 4' per second (maximum recommended flow rate is 8' per second).

VALVE

SIZE

2-Way

(Kv)/Ft.

of PIPE EQUIV.*

CLOSE-OFF PSI

(kPa)

3-Way

(Kv)/Ft.

of PIPE EQUIV.*

⁄

" 4.9 (4.3) / 9.5

0-125 psi

(0-862 kPa)

1.5 (1.3) / 111

⁄

" 10.3 (8.9) / 8.4 3.3 (2.8) / 82

1" 8.9 (7.7) / 47.4 3.0 (2.6) / 411