Engineered Comfort Fan Coil Controller EZstat Especificaciones descargar pdf (Pagina 29)

Installation and Operation Manual

●

Fan Coil Controller – EZstat

EC-EZstat

Date: 9-2014 Supersedes: NEW

Engineered Comfort reserves the right to change any information concerning product or speciﬁcation without notice or obligation.

Page 29 of 36

  ModulangvalvesCont.

• Normal — The valve is fully closed when the output signal is 0 volts and fully open when the output is 10 volts DC.

• Reverse —The valve is fully closed when the output signal is 10 volts and fully open when the output is 0 volts DC.

Two-pipewatersupplytemperatureevaluaon

For two‑pipe fan coil units, the EZstat uses the WST sensor to determine if chilled or hot water is being supplied to

the unit. The water type is determined by comparing the value of the WST input to the room temperature. The EZstat

programming then determines that the water temperature is one of the following:

• Chilled—the water temperature is 10° F below room temperature. Hot—the water temperature is 10° F above room

temperature.

• None—the water temperature is within 7° F of room temperature.

If the water temperature is evaluated as None, the EZstat runs the water evaluaon program every six hours. During a

water evaluaon, the EZstat opens the valve unl a water type is determined or for ve minutes, whichever is reached

rst. If a water evaluaon is not being performed, the valve remains closed.

The supply water type is stored in mulstate variable Water Available.

Two-pipe with electric heat

For EZstat fan coil models that support both on/o and modulang valves, electric heat can be added to two‑pipe systems.

Typically this heat is a duct or baseboard resistance heater controlled by a relay.

When the supply water type is chilled water and there is a call for heat, the EZstat controls the heang element through

output terminal BO5. The output turns on when the heang loop is equal or greater than 40%. The output is turned o

when the loop falls below 40%. If the supply water type is hot water, only the water valve output is used to sasfy a call

for heat.

 7.9 Fanoperaonforfancoils

The EZstat supports both modulang fans and fans with one, two, or three speeds. Speed for either type of fan is

determined directly o room temperate and the fan is controlled by the PID loops. Fan speed control is set up from the

user interface by a user with Password 2.

7.10 One, two, and three speed fans

For one, two, and three speed fans, the EZstat controls the fan speed with terminals FAN‑L, FAN‑M, and FAN‑H. This

feature applies to Fan Speed, located in System menu.

The user selects on the interface the Fan selecon ‑ Auto, and then in the SYSTEM menu select Fan Speed. See in Enter the

Commissioning Mode.

• Single speed fans use terminal FAN‑L only

• Two speed fans are controlled with terminals FAN‑L and FAN‑H

• Thee speed fans use terminals FAN‑L, FAN‑M, and FAN‑H

The fan output terminals are energized as the cooling or heang loop varies from 0‑100%. Terminal acvaon is shown in

the following table. The values listed below correspond to loop percentages.

 Table7-1 TerminalAcvaon(AutoMode)

Fan L terminal Fan M terminal Fan H terminal

Fan speed On O On O On O

One *0% 5% n/a n/a n/a n/a

Two *0% 5% n/a n/a 95% 80%

Three *0% 5% 65% 50% 95% 80%

Fan minimum is enabled at dead band sequence, and loop percentage not applicable.

NOTE

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 35 36

Comentarios a estos manuales

Sin comentarios

Engineered Comfort Fan Coil Controller EZstat Especificaciones Pagina 29

Comentarios a estos manuales

Relacionado con productos y manuales para Termostatos Engineered Comfort Fan Coil Controller EZstat