Honeywell F74C Reverse Rinsing Filter & MV876 Automatic-Backwash Controls

Application

The F74C Reverse Rinsing Water Filters are used at the point-of-entry (POE) to remove sediment and debris from residential or commercial water systems, ensuring a continuous supply of filtered water. The fine filter prevents the ingress of foreign bodies, such as rust particles and grains of sand. The flow, filtering capacity, and ease of cleaning make the F74C an ideal filter for demanding applications. Both horizontal and vertical installations are possible.

The MV876 Automatic-Backwash Control is available as an accessory. This control fits onto the drain valve and is programmed by the user to automatically perform the backwash function according to a desired interval.

Specifications

IMPORTANT: The specifications provided do not include normal manufacturing tolerances. Units may not exactly match listed specifications. Products are tested and calibrated under closely controlled conditions, and minor performance differences may occur if conditions change.

F74C:

Models: Water filters with 100 micron screens and hose connections.

• F74C1015: 3/4 in. sweat and NPT threaded tailpieces.
• F74C1023: 1 in. sweat and NPT threaded tailpieces.

Materials of Construction:

• Body: Engineered plastic.
• Inlet/Outlet Adapter: Bronze.
• Sump: Engineered plastic.
• Screen: Stainless steel.
• Internal Construction: Acetal copolymer.
• Seals: NBR.
• Ball Valve: Brass with PTFE seals.

Inlet Pressure:

• Minimum: 22 psi (with unrestricted backwash discharge).
• Maximum: 232 psi.

Medium:

Water.

Maximum Operating Temperature:

86°F (30°C).

Pipe Size:

3/4 in. and 1 in.

Mounting Position:

For vertical or horizontal installation (filter bowl always downwards).

Dimensions:

See Fig. 1 and Table 1.

Weight: 3/4 in.: 6 lb (2.7 kg). 1 in.: 7 lb (3.2 kg).

Operating Pressure Drop Versus Flow: See Fig. 2. Maximum recommended: 3 psi to 7 psi (with clean screen).

Connections: Union on inlet and outlet: External NPT threaded or sweat. Inlet/outlet assembly can be rotated to fit on vertical or horizontal piping.

Screen Sizes: Shipped with Device: 100 microns.

MV876 Automatic-Backwash Control:

MV876B1018: Bayonet mounted shaft of 24 Vac motor and timer replaces ball valve manual control for automatic backwash at preprogrammed intervals. 24V transformer not included. For use with F74C and F76S Filters only.

Specifications:

• Power: 4 VA.
• Current: 170 mA.
• Voltage: 24 Vac.
• Cycle time: 20 seconds (approximate).
• Timer: Variable. See Table 3.

Planning the Installation

The F74C should be sized based on the required flow rate and the resulting pressure drop across the filter. As a guideline for most applications, the F74C should be sized for a pressure drop between 3 psi and 7 psi.

EXAMPLE: What size F74C is required to provide a flow rate of 20 gpm? Reading Table 2 at 20 gpm, a 3/4 in. model has 5 psi drop and a 1 in. model has 4 psi drop. As both models meet the 3 to 7 psi range, the selection should be based on size preference.

An increased pressure drop across the filter results when higher velocities are maintained to increase the capacity through any given size filter. Severe pressure drops will be encountered as capacity approaches that of the pipe size. To ensure the backwash cycle operates properly and cleaning action is not reduced, follow all recommendations in Fig. 3. Refer to Fig. 3a for an ideal installation.

All filter installations are different. The size, type, and amount of dirt and debris, and the flow rate must always be considered when choosing a screen and deciding to install multiple F74C Water Filters in parallel.

Installation

When Installing this product...

Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition.

Check ratings given in these instructions and on the product to make sure the product is suitable for your application.

Make sure the installer is a trained, experienced service technician.

Use these instructions to check out product operation after installation.

CAUTION: Equipment Damage Hazard.

Excessive pressure or temperature can damage the device. Make sure water temperature and pressure are below maximum ratings specified.

CAUTION: Equipment Damage Hazard.

Excessive heat can damage internal parts. Before sweat soldering, separate the tailpieces and nuts from the inlet/outlet adapter.

F74C Installation:

When installing an F74C, use the following procedure:

1. Shut off water supply by closing the water supply valve.
2. Install inlet/outlet adapter so that filter is vertical.
3. Install the F74C in the water line with the arrow pointing in the direction of water flow.

IMPORTANT: When using an MV876, stop here and install the MV876.

4. Open a downstream tap.
5. Slowly open the water supply valve.
6. Once the F74C sump fills with water, close the downstream tap and fully open the water supply valve.

MV876 Installation:

1. Open the backwash outlet ball valve. Remove the backwash outlet handle.
2. Install the MV876. See Fig. 9 and 10.
3. When rotating the MV876 on installation, it closes the backwash outlet ball valve.
4. Connect the MV876 to a 24 Vac power supply. See Fig. 14.
5. Open a downstream tap.
6. Slowly open the water supply valve.
7. Once the F74C sump fills with water, close the downstream tap and fully open the water supply valve.
8. Program the desired backwash interval by pushing the program button until the desired interval number appears in the display.