Venmar 1200 cfm Bedienungsanleitung PDF herunterladen (Seite 21)

Page 21

Controls Data

Sequence Of Operation

Before start-up, check the unit for obstructive packaging,

objects near or in blowers, dampers, etc. Once installation is

complete, close the doors and check for correct unit operation

as described in the Ventilation Control section below.

Ventilation Control

Install the power to the unit as per local electrical codes and

complete the following ventilation control modes to ensure

proper unit operation.

Unoccupied Mode

With Or Without Ventilation Call

• Occupied timer/sensor connection open (unoccupied mode).

• Supply and exhaust fan motors are off.

• Recirculation defrost damper (if equipped) closes off the

outside air opening.

• External hood dampers (if equipped) are closed.

Occupied Mode

No Ventilation Call

• Occupied timer/sensor connection closed (occupied mode).

• Supply and exhaust fan motors are off.

• Recirculation defrost damper (if equipped) closes off the

outside air opening.

• External hood dampers (if equipped) are closed.

Ventilation Call

• Occupied timer/sensor connection closed (occupied mode).

• Recirculation defrost damper (if equipped) opens, allowing

outside air to enter the unit.

• External hood dampers (if equipped) are open.

• Low speed connection closed (wire across low to common);

supply and exhaust fan motors operate in low speed.

• High speed connection closed (wire across high to common);

supply and exhaust fan motors operate in high speed.

NOTE: If unit is equipped with single speed motors, motors will

operate on a call for either low or high speed ventilation.

Fan Interlock Contact

When connecting an HRV to the existing ductwork system of

an air handler, typically the air handler should be running when-

ever the ventilator is running. To achieve this combination, there

is a set of open contacts (labeled "FF") on the microprocessor

board which close when the ventilator is running. Please refer

to the wiring schematic for the exact location of these contacts.

HRV Control Wiring

A low voltage remote terminal strip interface is provided on all

units to allow interconnection of field wired controls. Depending

on the unit configuration, the low voltage remote wiring terminal

strips are either located on the exterior of the unit or inside the

unit on the control box. All field installed low voltage wiring must

be Class II and connected according to local codes. Excluding

the Wall Control terminals, all terminals are 24 VAC or dry con-

tact control.

NOTE: Refer to unit installation and operations manual for field wiring

to terminal strips of optional accessories.

Terminal Connections

Wall Control (Optional)

• Requires a 4-wire LVT 24 gauge (or equivalent); remote

wall control runs on 12 VDC.

Occupied (or Unoccupied) Timer/Sensor

• Requires dry contact; considered the "master control" for

the unit.

Voltage - 24 VAC

• Provides 24 VAC, 40 VA for powering of accessories or

field wiring devices.

Remote Fan Control (LOW, COMMON, HIGH)

• Requires dry contact; contact closure across LOW-COM

terminals engage low speed fan operation; contact closure

across HIGH-COM terminals engage high speed fan (if

equipped).

Dirty Filter Indicator (Optional)

• Terminals used for interconnection of dirty filter sensor and

light indicator (optional).

Unocc. Recirc Controls (Unoccupied Recirculation Contacts,

Recirculation Defrost Units Only)

• Requires 24 VAC; places unit in recirculation ventilation

mode allowing recirculation of air during unoccupied mode.

Field Wired Terminals

• Used for field connecting of field supplied controls.

CONTROL CONTACTS

CLASS 2 VOLTAGE

WALL CONTROL

BLACK

NOTE:

Connections are all dry contacts

except wall control, wheel alarm

contacts and 24 VAC power contacts.

Use of 24 VAC circuit requires

isolating contacts (ex. thermostat)

to prevent interconnection of

Class 2 outputs.

RED

OCCUPIED

TIMER/

SENSOR

FIELD WIRED

TERMINALS

UNOCC.

RECIRC

CONTACTS

LOW

COMMON

HIGH

DIRTY

FILTER

INDICATOR

(1.5A-24 VAC)

(ERV UNITS)

WHEEL

ALARM

OPTION

(24 VAC)

(ERV UNITS)

ENTHALPY

(-) 24 VAC

(40 VA)

(+) 24 VAC

GREEN

YELLOW

(RECIRC UNITS)

Terminal Connections Diagram

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 27 28

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