Installation Guide for Honeywell models including: F74C Reverse Rinsing Filter MC876 Automatic Backwash Controls

F74C REVERSE RINSING FILTER MV876 AUTOMATIC BACKWASH CONTROLS

INSTALLATION INSTRUCTIONS

Honeywell TECHNICAL COMMUNICATIONS

F74C REVERSE RINSING FILTER MV876 AUTOMATIC ...

MV876B1018: Bayonet mounted shaft of 24 Vac motor and timer replaces ball valve manual control for automatic backwash at preprogrammed intervals. 24V ...

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62-0165
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longer manufactured F74C Reverse Rinsing Filter;

MV876 Automatic-Backwash Controls

F74C

MV876B1018 (Bayonet fitting for F74C)

APPLICATION
`The F74C Reverse Rinsing Water Filters, used at point-of-entry (POE) to remove sediment and debris from residential or commercial water systems, ensure 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 the ideal filter for the most demanding applications. Both horizontal and vertical installations are possible.
The MV876 Automatic-Backwash Control is available as an accessory. This control is fitted to the drain valve and is programmed by the user to automatically perform the backwash function according to the desired interval.

INSTALLATION INSTRUCTIONS
SPECIFICATIONS
IMPORTANT The specifications given in this publication do not include normal manufacturing tolerances. Therefore, units may not exactly match the listed specifications. Also, products are tested and calibrated under closely controlled conditions, and some minor differences in performance can be expected if those conditions are changed.
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 (filter bowl always downwards).
Dimensions: See Fig. 1 and Table 1.

® U.S. Registered Trademark Copyright © 2001 Honeywell · All Rights Reserved

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F74C REVERSE RINSING FILTER; MV876 AUTOMATIC-BACKWASH CONTROLS

L l

h H

D

r

T

M18087

Fig. 1. Dimension drawing of F74C.

Table 1. Dimensions of F74C in in. (mm).

Dimension H h L l D r t T

Connection Size

3/4

1

12-13/16 (324) 12-13/16 (324)

11-3/16 (285)

11-3/16 (285)

6-3/8 (162)

7-1/4 (184)

3-9/16 (90)

3-15/16 (100)

4-1/8 (105)

4-1/8 (105)

1-1/16 (27)

1-1/16 (27)

2-5/8 (66)

2-5/8 (66)

5-5/16 (150)

5-5/16 (150)

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).

80.0

70.0

60.0

FLOW (GPM)

50.0

40.0

30.0

20.0

10.0

0.0 0

3

7

10

PRESSURE DROP (PSI)

MAXIMUM RECOMMENDED PRESSURE DROP WITH CLEAN SCREEN.

F74C1015 F74C1023

20 M17656

Fig. 2. F74C Pressure drop vs. flow.
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.
Accessories for F74C: AF74-1A Replacement filter assembly for F74C, 3/4 in.
and 1 in., 100 micron; includes the filter insert complete (O-ring, mesh with mesh support, impeller), sump O-ring (mounted between the filter housing and the sump). KF74-1A Replacement sump assembly for the F74C; includes the sump assembly complete (ball valve, plastic air gap adaptor), sump O-ring (mounted between the filter housing and the sump). TBD Opaque sump cover for F74C 3/4 in. and 1 in. U76S5015 3/4 in. sweat tailpiece. U76S5023 1 in. sweat tailpiece. U76T1014 3/4 in. NPT tailpiece. U76T1022 1 in. NPT tailpiece. 901444 Union gasket for F74; 3/4 in., 10 gaskets in package. 901445 Union gasket for F74; 1 in., 10 gaskets in package. ZR 10 K-34 Double ring wrench for removing filter bowl.

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F74C REVERSE RINSING FILTER; MV876 AUTOMATIC-BACKWASH CONTROLS

Model F74C1015 F74C1023

Table 2. Flow Capacity of F74C in Gallons per Minute (gpm).

Pressure Drop in psi

Size

1

2

3

4

5

3/4

9.0

12.7

15.6

18.0

20.1

1

10.1

14.3

17.5

20.2

22.6

15 34.9 39.1

Cv 9 10.1

Table 3. MV876B Timer Selections.

Program Value 1 2

Backwash Interval 4 minutes 8 minutes

3

16 minutes

4

32 minutes

5

1 hour

6

2 hours

7

4 hours

8

8 hours

9

17 hours

10

34 hours

11

3 days

12

6 days

13

11 days

14

23 days

15

45 days

16

3 months

M17705
Fig. 3. Ideal F74C installation. A funnel mounted directly under the backwash
port is the best installation layout.

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.

M17706
Fig. 4. Make sure the inlet pipe is not downsized.
M17707
Fig. 5. Make sure the backwash outlet pipe is not downsized, long or crimped. Instead, install a short oversized pipe on the backwash outlet. Do not use a low capacity solenoid
valve to automate the backwash cycle.

3

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F74C REVERSE RINSING FILTER; MV876 AUTOMATIC-BACKWASH CONTROLS

M17708
Fig. 6. Make sure the backwash outlet is not raised above the F74C. If the backwash outlet must be
raised above the F74C, increase the inlet pressure 5 psi for every 10 feet that it is raised.

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.

M17709
Fig. 7. Make sure the F74C is not used with an undersized pump. An undersized pump may not provide proper pressure or flow.
M17704
Fig. 8. Make sure the F74C is not installed in a bypass across a pump.
INSTALLATION
When Installing this product...
Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition.

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 you rotate 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.

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MV876B

Fig. 9. Installing the MV876.

M16481

1. Unscrew the four housing screws and set them aside. See Figure 11.

IMPORTANT
Make sure the connecting cable is protected from damage when the MV876 cover is removed.

MV876B M16483

2. Remove the MV876 cover. See Fig. 11. 3. Insert four AA alkaline batteries. See Fig. 12. 4. Replace the cover. 5. Replace and tighten the four housing screws. 6. To avoid unnecessary battery drainage, connect
the MV876 to power as soon as possible after inserting new batteries. 7. To ensure the availability of battery power, replace the batteries after a power loss. If the 800 mA fuse blows, replace it as follows:

Fig. 10. Final position of MV876 and F74C.
As the F74C operates, screens become plugged. Backwash the F74C when the pressure gauge measures about five psi lower than when first installed. However, each installation is different. Residential applications can require backwash only once a week, or once every few weeks.
For residential applications, backwashing the F74C once a week, regardless of need, is an excellent guideline to follow to ensure F74C peak operating efficiency.
Fitting Batteries and Fuses
The batteries (not included) provide power to the MV876 in the event of a power loss. This is desirable, especially when power loss occurs during the reverse rinsing cycle. to provide this, the MV876 requires four AA alkaline batteries. Install these batteries in the cover of the MV876 as follows:
WARNING
Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry. Disconnect power supply before installing the batteries or fuses.

WARNING
Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry. Disconnect power supply before installing the batteries or fuses.
1. Unscrew the four housing screws and set them aside (see Fig. 11).
IMPORTANT make sure that the connecting cable is protected from damage while the MV876 cover is removed.
2. Remove the MV876 cover. 3. Remove and discard the old fuse (see Fig. 13). 4. Insert a new 800 mA fuse. 5. Replace the cover. 6. Replace and tighten the four housing screws. 7. Reconnect the power supply.

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F74C REVERSE RINSING FILTER; MV876 AUTOMATIC-BACKWASH CONTROLS

MV876B

M17351

Fig. 13. Replacing the MV876 fuse.

WIRING

Fig. 11. Removing the MV876 cover.

M17352

MV876B
M17353
Fig. 12. Installing batteries in the MV876.

WARNING
Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry. Disconnect power supply before wiring.
IMPORTANT All wiring must comply with applicable codes and ordinances.
MV876
1. Mount the 24 Vac transformer and wire as shown in Fig. 14.
2. Reconnect power to the system. When the system is powered, the MV876 will run through one backwash cycle (approximately 20 seconds).
3. Set MV876 backwash interval to the desired setting. See the Operation section.
4. Check MV876 operation by interrupting primary power to the transformer. When power is switched back on, the MV876 will backwash the F74C once.

MV876

1 L1 (HOT)
L2

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

M16484

Fig. 14. Wiring diagram for F74C with MV876.

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F74C REVERSE RINSING FILTER; MV876 AUTOMATIC-BACKWASH CONTROLS

F74C REPLACEMENT PARTS LIST (SEE FIG. 15).

Table 4. Parts and Accessories for F74C.

Letter in Part Number Fig. 15

Description

Contents

U76S5051 A

3/4 in. sweat tailpiece

Tailpiece

U76S5023 A

1 in. sweat tailpiece

Tailpiece

U76T1014 B

3/4 in. NPT tailpiece

Tailpiece

U76T1022 B

1 in. NPT tailpiece

Tailpiece

901444

C

Union gasket, 3/4 in.

10 gaskets in package

901445

C

Union gasket, 1 in.

10 gaskets in package

AF74-1A

D

Replacement filter assembly for Includes the filter insert complete (O-ring, mesh with F74C, 3/4 in. and 1 in., 100 micron. mesh support, impeller), sump O-ring (mounted
between the filter housing and the sump).

KF74-1A

E

Replacement sump assembly for F74C

Includes the sump assembly complete (ball valve, plastic air gap adaptor), sump O-ring (mounted between the filter housing and the sump).

A B C C B A

E D

M18212
Fig. 15. F74C Exploded View. parts are keyed to F74C Replacement parts List.

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