Honeywell VCZA Series Manual Download Page 1

INSTALLATION

WHEN INSTALLING THIS PRODUCT:

1.

Read these instructions carefully.  Failure to follow them could 

damage the product or cause a hazardous condition.

2.

Check the ratings given in the instructions and on the product to 

make sure the product is suitable for your application.

3. Installer must be a trained and  experienced service 

technician.

4.

Always conduct a thorough check-out when installation is 

completed.

5.

While not necessary to remove the actuator from the body, 

it can be removed for ease of installation.  The actuator can 

be installed in any of the four orientations to suit the most 

convenient wiring direction.  Actuator latching mechanism works 

only when the lengths of the actuator and the valve body are 

parallel to each other.

PLUMBING

The valve may be plumbed in any angle, including vertical piping, 

but preferably not with the actuator below horizontal level of the 

body.  Make sure there is enough room around the actuator for 

servicing or replacement.  

3

For use in diverting applications, the valve is installed with the flow 

water entering through bottom port AB, and diverting through end 

ports A or B.  In mixing applications the valve is installed with inlet 

to A or B and outlet through AB.

Mount the valve directly in the tube or pipe.  Do not grip the 

actuator while making and tightening up plumbing connections.  

Either hold valve body in your hand or attach adjustable spanner 

(38 mm or 1-1/2") across hexagonal or flat faces on the valve body 

(Figure 4).

If assembling valve train on a bench, take care not to deform body 

with vice.  

Do not place the raised "H" logo between the jaws of 

the vice.

 Excess jaw force can deform the body.

COMPRESSION MODELS

For compression fitted models, tighten the compression nuts 

enough to make a watertight seal. TAKE CARE NOT TO OVER 

TIGHTEN. Maximum torque limit is 33 ft-lb for the 22 mm 

compression fitting, and 48 ft-lb for the 28 compression fitting.

SWEAT MODELS

On sweat fitted valves, the cartridge is shipped loose to avoid 

being damaged during the solder operation.

1.

Remove valve actuator from body and solder the connecting 

pipes in accordance with normal soldering practices.

2.

After soldering and valve has cooled, remove cartidge assembly 

from plastic bag, insert into the valve body and tighten down 

with enclosed wrench until it bottoms out. DO NOT OVER 

TIGHTEN (maximum torque is 40 in-lb).  See Figure 5.

3.

Replace valve actuator.

TO REPLACE CARTRIDGE (IF REQUIRED)

Two-way cartridges fit all two-way bodies. The Cv rating of a valve 

can be changed by replacing the cartridge, allowing for unique 

combinations. Three-way cartridges fit all three-way bodies. 

Cartridges for proportional control applications have high force 

springs color-coded red. 

1.  Disconnect power supply before servicing to avoid electrical 

shock or equpiment damage.

2.  Depending on the installation, it may be necessary to disconnect 

leadwires to valve actuator, or depress tab on Molex™ connector 

and remove.  Where appropriate, label wires for rewiring.

3. Remove valve actuator by pressing up on the latch mechanism 

located directly below the red manual open lever with thumb (See 

Figure 5).  Simultaneously press the actuator down towards the 

valve body with moderate hand force and turn the actuator counter-

clockwise by 1/8 turn (45°).   Lift actuator off the valve body.

!

PROPER USE:  

              

These valves are only for use in cold, warm, and hot 

water applications. They are designed for a medium 

temperature range of from 34 to 203°F (1 to 95 C), at a 

maximum pressure of 300 psig (20 bar).  They are to be 

operated with the appropriate Honeywell actuators only. 

Water must be properly filtered, treated and conditioned 

according to local conditions.

The presence of suspended particulate(s) in the system, 

such as detached calcium scale, sand, silt, large 

quantities of magnetite, etc., can affect operation of 

the valve.  For trouble-free operation of this product, 

good installation practice should include initial system 

flushing, chemical water treatment, and the use of a 

50 micron (or finer), 10% system side-stream filter(s).   

Remove all filters before flushing.

Put the VC actuator manual lever in the fully up position or 

the half open (down) position to allow initial system flushing 

with the actuator mounted. This may be done without 

electrical hook-up. Alternatively, reusable flush caps, part 

# 272866B, may be purchased separately for use in initial 

flushing of dirty hydronic systems.

Do not use boiler additives, solder flux and wetted 

materials which are petroleum based or contain 

mineral oil, hydrocarbons, or ethylene glycol acetate.  

Compounds which can be used, with minimum 50% 

water dilution, are diethylene glycol, ethylene glycol, and 

propylene glycol (antifreeze solutions).

CAUTION:    

           

Disconnect power supply before connecting wiring to prevent 

electrical shock and equipment damage.
On 24V systems, 

never 

jumper the valve coil terminals, even 

temporarily.  This may damage the thermostat.

Figure 4 - Plumbing of the VC Valve

!

IMPORTANT: 

The presence of iron oxide(red rust) in the system voids the 

valve warranty.              

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