GE mn-28000_series Service Manual download pdf (Page 11)

Masoneilan VariPak Adjustable Cv Control Valves Instruction Manual | 11

Insulation: If the valve is to be insulated, ensure that the

insulation does not exceed the shaded area shown in

ﬁgure 10 below.

Figure 10 - Insulation limit for a VariPak valve

3.3 Pneumatic and Electrical Circuit

(Figures 3, 11 and 12)

- On-off valve: connect the air supply line directly to the

1/8" NPT threaded connection in diaphragm cover

(137).

- Control valve with 7700P positioner (air signal):

connect the supply and instrument signal lines to the

appropriate connections on the manifold block (144)

(ﬁgure 11). Use 4 x 6 mm (1/4" O.D.) tubing.

- Control valve with 7700E positioner (electrical signal):

connect the manifold block (144) air supply line and

make the electrical connection for the I/P module (20)

(ﬁgure 12).

Use 4 x 6 mm (1/4" O.D.) tubing for the air line.

Note: Check that the supply pressure is that indicated on

the serial plate.

7700P or 7700E positioners can be installed on

both VariPak 28001 single-lever and VariPak 28002

adjustable-C

valves.

Figure 11 - Connections with 7700P positioner

Figure 12 - Connections with 7700E positioner

3.4 Limit Switches (Figure 13)

In some cases, limit switches can be provided for the

VariPak valve, on request. These are wired and adjusted

in the factory to customer order. The black wire is

connected to either the normally open or normally

closed terminal of the upper limit switch. The black and

white wire is connected to the common terminal of this

switch. The red wire is connected to either the normally

open or normally closed terminal of the lower limit

switch.

The red and white wire is connected to the common

terminal of this switch. To adjust limit switches, loosen

their fasteners and move the valve to the required

position. Adjust the position of the switch until it trips.

Tighten fasteners (160 - 161 - 162).

Figure 13 - Limit switch installation

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GE mn-28000_series Service Manual Page 11

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