Orion-system MHGRV III Manual de usuario descargar pdf (Pagina 3)

Operator Interface 3

MHGRV III Controller Technical Guide

General

The MHGRV III Controller is designed to control a Modulating Hot

Gas Reheat Valve to maintain a desired Supply Air Temperature and

Humidiﬁ cation setpoint. The controller can be used as a stand-alone con-

troller or it can be connected to and used in conjunction with the AAON

Factory Packaged HVAC unit controller. The MHGRV III controller is

connected to the HVAC unit controller via a modular expansion cable

and corresponding connectors on the controllers.

Features

The MHGRV III provides the following:

 Can be operated as a stand-alone controller or

integrated with the HVAC Unit Controller

 Provides for Supply Air Temperature Setpoint

reset when required

 Second stage reheat capability when using

2 Hot Gas Reheat Valves

 Control of reheat solenoid valve to provide coil

ﬂ ushing for positive refrigerant oil return

 Expansion capabilities for controlling additional

modulating hotgas values

Operation

When used in a stand-alone application (not connected to an HVAC unit

controller board), the MHGRV III controller will control the Modulating

Controller Overview

Hot Gas Valve to maintain the Supply Air Setpoint based on the Supply

Air Temperature Sensor connected to the MHGRV III controller. The

MHGRV III controller is activated by a 24 VAC wet contact closure

signal connected to the H1 (RHT EN) input terminal on the controller.

Heating Override and Cooling Override are also controlled by 24 VAC

wet contact closure signals connected to the HEAT OVR and COOL

OVR input terminals on the controller. The Supply Air Setpoint is set

by conﬁ guring a DIP switch on the MHGRV III controller board. Sup-

ply Air Temperature Reset is also available and is set by conﬁ guring

a DIP switch on the controller board. When Supply Air Temperature

Reset is used, it is reset by a 0-10 VDC signal supplied to the RESET

IN terminal on the MHGRV III controller.

When the MHGRV III controller is connected to an HVAC unit control-

ler board via its modular cable, it will operate exactly as the stand-alone

controller except that the following information will be passed between

the MHGRV III controller and the HVAC unit controller:

 Reheat Enable command

 Supply Air Temperature Setpoint. This replaces the

setpoint that is set with the Supply Air Temperature DIP

switch on the MHGRV III controller.

 The Reset Supply Air Temperature Setpoint. This replaces

the setpoint that is set with the Supply Air Temperature

Reset DIP switch on the MHGRV III controller. The Supply

Air Temperature Reset Signal is also supplied from the

HVAC unit controller.

 If the communication is interrupted between the MHGRV

III controller and the HVAC unit controller, the

MHGRV III controller will revert to stand-alone operation.

Figure 1: MHGRV III Controller Dimensions

128

SERIAL #

128

WATTMASTER CONTROLS

WDOG

C29

U16

C22

R61

U20

U12

U11

R77

R76

R75

R74

C13

C36

X2VR1

U19

U18

U17

U15

U14

U10

TB6

TB5

TB4

TB3

TB2

TB1

SW2

SW1

R73

R72

R71

R70

R69

R66

R65

R64

R63

R62

R60

R59

R58

R57R56

R55R54

R53

R52

R51

R50

R49

R48

R47

R46

R45

R44R43

R42R41

R40

R39

R35

R34

R33

R32

R31

R30

R29

R28

R21

R20

R19

R18

R17

R16

R15

R14

R13

R11

R10

P2 P1

D17

D15

D12

D11

C35

C34

C33

C31

C30

C28

C27

C26

C25

C24

C23

C21

C20

C18

C14

C12

C11

C10

C16

R78

U13

C15

C17

C19

R22

R23

R24

R25

R26

R27

R36

R37

R38

U22

U23

D10

U21

R79

COOL OVR

GND

SAT

HEAT OVR

RHT EN

RESET IN

AUX IN

GND

+VDC

VAVLE EXP

STATSTEP

0-5V

0-10V

4-20

THERM

FAN

CMP

VALVE

AUX

COM

CG/HR

CR/HG

CW/HW

CB/HB

AUX IN

RESET LIMIT SETPOINT

ADD ADD

24VAC

GND

REC

POWER

YS102138 REV 3

HOT GAS REHEAT III

AOUT

GND

CHASSIS GND

EPROM

485

DRV

OFF

PHILIPS

PCB80C552-5-16WP

500650=1/3

DFD9940SM

PHILIPS

10A250VAC ~

5A30VDC

VDE

G5Q-1A4

OMRON

DC24V

CHINA

10A250VAC ~

5A30VDC

VDE

G5Q-1A4

OMRON

DC24V

CHINA

10A250VAC ~

5A30VDC

VDE

G5Q-1A4

OMRON

DC24V

CHINA

10A250VAC ~

5A30VDC

VDE

G5Q-1A4

OMRON

DC24V

CHINA

.1uF

74HC541

TPIC6B259

74HC541

.1uF

.01uF

.1uF

10uF10uF

22pF 22pF

10uF

.1uF

10uF

.1uF

10uF

1002

1001

1002

2211

LM358

4751

1002

36503650

0404

.1uF

1002

4751

1002

LT1785

04 04

22pF 22pF

7500

1002

3650

4751

P82B96

.1uF

4751

3650

.1uF

100pF

1002

1502

1741

3831

1211

.22

NE5090

L293DNE

34063

1N5819

93C46

74HC573

CY62256LL

2500

3001

3011

RS1G

10020

PS2815-4

4751

3001

2211

SF000093a

11.059Mhz

WARNING

OBSERVE

POLARITY

SF000140

D16

VREF

D13

D14

R12

4.70

0.30

4.92

4.10

8.00

7.40

0.30

8.15

1 2 3 4 5 6 7 8 ... 19 20

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Orion-system MHGRV III Manual de usuario Pagina 3

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