Honeywell vc7900- User Manual

PRODUCT DATA

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95C-10831-04

VC7900 Series

Modulating Control Valves

The VC7900 Series Modulating Control Valves provide

optimum control of hot and/or chilled water flow in various

heating and cooling applications.

The VC hydronic valve consists of a valve body and

replaceable characterized cartridge assembly. When used with

a Honeywell VC7900 actuator, the valve provides proportional

flow in either diverting or mixing applications. They are

designed to provide sinusoidal valve actuator travel, and

therefore operate silently and resist water hammer. The

VC7900 series valve actuator is used with any 0-10 Vdc

controller.

SPECIFICATIONS

Supply Voltage:

Colour coded label

24V, 50-60Hz; Class 2 circuit

Blue

Control Signal:

Nominal 0/2 to 10 Vdc (actual 2 to 9 Vdc)

Input impedance 47.5 k ohms

Power consumption:

4 Watts Max. at nominal Voltage (during

valve position change). Use 24 V Class 2 transformer and

provide 6 VA for transformer and connection wire sizing.

Maximum Duty Cycle:

15%

Nominal timing:

Opens in 2 minutes @ 60 Hz

Actual Full Stroke Timing is 140 sec

Note: Timing is approximately 20% longer @ 50 Hz

Electrical termination (3 versions available):

(1) Molex™ (header # 39-30-1060). Requires mating connector

(receptacle/housing # 39-01-2060)- VC7930. OR

(2) With integral 1 meter (nominal 39") leadwire cable-

VC7931. OR

(3) With intergral 1 meter plenum-rated leadwire cable and 3/8”

flexible conduit connector (low voltage only)- VC7934

VC7934 meets UL94-5V requirements for installation in return

air plenums.

Operating ambient temperature:

0 to 65 °C (32 to 150 °F)

(VC7934 is 60 °C [140 °F] max.)

Shipping & storage temperature:

-40 to +65 °C (-40 to

+150 °F)

Atmosphere:

Non-condensing, non-corrosive, non-explosive.

VC7934 meets UL94-5V requirements for installation in return

air plenums.

Min. & max. fluid temperatures:

Max. – 4 Bar (60 psi)

Operating pressure differential:

Max. – 4 Bar (60 psi)

Pressure rating:

Static – 20 Bar (300 psi)

Burst – 100 Bar (1500 psi)

Valve material:

Body of bronze; cartridge of Ryton™

(polyphenylene sulphide) & Noryl™ (polyphenylene oxide);

O-ring seals of EPDM rubber; stainless steel stem.

Flow Characteristics:

Linear

The specifications above are nominal and conform to generally

acceptable industry standards. Honeywell is not responsible for

damages resulting from misapplication or misuse of its

products.

Accessories and Replacement Parts:

40007029-002: Wrench for removing VC cartridge

VCZZ1100: 2-way characterized cartridge, unit pack

VCZZ6100: 3-way characterized cartridge, unit pack

NOTE: Timing is approximately 20% longer @ 50 Hz.

Table 1. Series 70, 0/2-10 Vdc Actuator

Model Series

Voltage

(50/60 Hz)

Nominal

Stroke Timing

Electrical

Connection

VC7930

24 Vac

120 seconds at

60 Hz

6-pin Molex™

VC7931

1 meter cable

VC7934

24 Vac plenum-

rated

150 seconds at

50 Hz

1.5 m plenum-

rated cable