Engineered Comfort Fan Coil Controller EZstat Spezifikationen PDF herunterladen (Seite 17)

D17

9-10-07

FAN COIL UNIT PIPING PACKAGES

Manual Ball Valve with Memory Stop

(BV)

Ball valves, also known as end valves,

allow the unit to be cut off for servicing

purposes. They are often used for

water balancing. These full port ball

valves have a compact handle that

rotates 90 degrees. The return side

valve is supplied with an adjustable

memory stop position lever to limit

travel of the on/off handle where required. This allows the ball

valve to be closed and returned to the balance setting position

without re-testing the system.

Nominal size: 1/2" or 3/4" Shaft seals: Viton O-Rings

Body material: Forged brass Temp. rating: 325ºF max.

Ball: Chrome plated brass Pressure rating: 600 psi max.

Ball seal: Teflon Cv: 17 (1/2"), 40 (3/4")

Engineered Comfort Vertical Hi-Rise fan coil units are supplied

as standard with a factory supplied and installed valve

package for the main cooling coil and optional heating coil.

This assures all components are compatible with the

application and install with the physical restrictions of the

cabinet for ease of maintainance and service.

Engineered Comfort Horizontal fan coil units have standard

valve packages available as a factory installed or “ship loose”

option for field connection.

Valve packages consist of a variety of components and

selection is dependent upon the application. The following

section provides a detailed description of each of the

components. Photos are for general representation purposes

only. Vendors and models are subject to change without

notice.

Manual Ball Valve

with P/T Port

(BVPT)

Same use as BV

above except in

addition, the supply

and return side valve

includes a Pressure /

Temperature (PT)

Port to allow testing

of water pressure,

different pressure or water temperature across the coil/valve

package assembly. The return side valve is supplied with an

adjustable memory stop where required for balancing.

Nominal size: 1/2" or 3/4" Shaft seals: Viton O-Rings

Body material: Forged brass Temp. rating: 325ºF max.

Ball: Chrome plated brass Pressure rating: 600 psi

Ball seal: Teflon Cv: 21 (1/2"), 42 (3/4")

2-Way, 2-Position Control Valve /

Actuator

All valves are piped on the return

side of the coil. Figure 3 shows the

valves in the open position or full

flow position. The valve spring

provides the necessary force to

hold the stem in the raised or

Normally Open (NO) position.

In the open position, water can flow

through the coil to heat or cool the

space. In the closed position, water

cannot flow. Actuators are 2-

position spring return operation.

The Normally Open (NO) or

Normally Closed (NC) valve

position (relative to water flow

through the coil) on power failure is

determined by the actuator model

selection. NO / NC action must be

compatible with the thermostat /

control package selection.

Actuator are available for line and

24 Vac low voltage applications.

Nominal size: 1/2" or 3/4"

Body material: Brass

Pressure rating: 125 psi max.

Temperature rating: 230ºF max.

Max. close off pressure: 44 psi

Cv: 2.5 (1/2"), 4.1 (3/4")

Actuator power consumption:

10 VA max.

AB A

ABA

COM

3-Way, 2-Position Control Valve /

Actuator

3-Way valves are piped on the

return side of the coil as mixing

valves. In the open position, water

can flow through the coil to heat or

cool the space and the bypass port

is closed. (Flow is A to AB). In the

closed position, water cannot flow

through the water coil and is

diverted to flow through the

bypass line (Flow is B to AB)

maintaining full flow through the

bypass port. Actuators are

2-position spring return operation.

The NO / NC valve position on

power failure (relative to water flow

through the coil) is determined by

the actuator model selection and

must be compatible with the

thermostat / control package

selection.

Actuator are available for line and

24 Vac low voltage applications.

Nominal size: 1/2" or 3/4"

Body material: Brass

Pressure rating: 125 psi max.

Temperature rating: 230ºF max.

Max. close off pressure: 44 psi

Cv: 2.5 (1/2"), 4.1 (3/4")

Actuator power consumption:

10 VA max.

Components and Specifications

Figure 1. 2-way Valve

(Normally open to coil flow)

Figure 2. 3-way Valve

(Normally open to coil flow)

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Engineered Comfort Fan Coil Controller EZstat Spezifikationen Seite 17

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