Honeywell MV876, F74C User Manual

62- 0165

Braukmann

F74C

MV876B1018 (Bayonet fitting for F74C)

F74C Reverse Rinsing Filter;

MV876 Automatic-Backwash Controls

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.

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.

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.

F74C REVERSE RINSING FILTER; MV876 AUTOMATIC-BACKWASH CONTROLS

M18087

80.0

70.0

60.0

50.0

40.0

30.0

20.0

10.0

03 710 20

0.0

PRESSURE DROP (PSI)

FLOW (GPM)

F74C1023

F74C1015

MAXIMUM RECOMMENDED PRESSURE DROP WITH CLEAN SCREEN.

M17656

Connections: Union on inlet and outlet: External NPT

Fig. 1. Dimension drawing of F74C.

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

Connection Size

Dimension

3/4 1

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

h 11-3/16 (285) 11-3/16 (285)

L 6-3/8 (162) 7-1/4 (184)

l 3-9/16 (90) 3-15/16 (100)

D 4-1/8 (105) 4-1/8 (105)

r 1-1/16 (27) 1-1/16 (27)

t 2-5/8 (66) 2-5/8 (66)

T 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).

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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.

Fig. 2. F74C Pressure drop vs. flow.

F74C REVERSE RINSING FILTER; MV876 AUTOMATIC-BACKWASH CONTROLS

M17705

M17706

M17707

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

Pressure Drop in psi

Model Size

F74C1015 3/4 9.0 12.7 15.6 18.0 20.1 34.9 9

F74C1023 1 10.1 14.3 17.5 20.2 22.6 39.1 10.1

Table 3. MV876B Timer Selections.

Program Value Backwash Interval

1 4 minutes

2 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 d a ys

12 6 days

13 11 days

14 23 days

Fig. 3. Ideal F74C installation. A funnel mounted directly under the backwash

port is the best installation layout.

15 45 days

16 3 months

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.

Fig. 4. Make sure the inlet pipe

is not downsized.

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.

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