Honeywell W7080A User manual

Honeywell

THIS SOLID-STATE SYSTEM ISACOMPONENT

FOR COMPONENT FIELD REPLACEMENT

FOR THE RANCO EA3 LODAPT SYSTEM. THE

BASIC SYSTEM CONTROLS UP TO 12 ZONE

DAMPERS, 3 HEATING STAGES, 3 COOLING

STAGES, AN INTEGRATED ECONOMIZER,

AND MODULATING VALVES FOR HOT WATER

AND CHILLED WATER. OPTIONAL UNITS

PROVIDE CONTROL OF UPTO 12ADDlTlONAL

ZONES, 5 STAGES OF ELECTRIC HEAT,

VARIABLE AIR VOLUME (VAV) SYSTEM FAN,

AND A FOURTH STAGE OF COOLING.

Modulated DC

voltage

signal from zone

thermostat, modified by zone discharge

sensor, provides direct control of

associated zone damper.

•i Pilot duty SPDT relays control heating

and cooling stages.

Economizer uses

M745K

M745L

motor

to provide true first stage of cooling, using

outdoor air whenever possible.

•i System switches all stages off when

power is intermpted; switches all stages

on when power is restored. Compressor

turn on time delays must be incorporated

for each compressor.

Power supplies in

W7080A

Load Analyzer

and W7084A Zone Adder are short-circuit

protected. Short circuits of 24 Vdc from

load analyzer or zone adder will not

damage their power supplies.

Night setback and cooling shut-down for

individual or all zones by adding a time

clock.

HG/KH Form

Number

63-4179

7/90

Honeywell

1990

SYSTEM COMPONENTS:

All

components

the

W7080

Multizone

Control

System

are

briefly described in this

section.

For detailed information

C7046B and

C7100B

sensors. T7080A,B Thermostats and

W7081A Limit Controller, refer to the associated specifica-

tion

sheets

(form

number

in parenthesis): C7046B

(60-

2350),

C7100B

(60-2539),

T7080A,B

(60-2527),

W7081A

(60-

2512).

C7046B

Temperature

Sensor

(Ranco

TR1-1001)

non-

averaging type with 6 in.

[152

mm]

probe

for

use in

ducts

where

space

does

not

permit

longer

C7100B.

C7100B

Averaging

Temperature

Sensor

(Ranco

TR1-

1002,-1003)

installed

in hot

deck,

cold

deck

and

mixed air

ducf

provide

limit signals for limit controller operation.

Also

installed

discharge

air duct of

each

zone to provide

anticipation

for the T7080 Thermostat. Sensor probe

length

is 13 in. [330 mm].

H205A

Enthalpy

Controller

(Ranco

(15)

senses

heat

content (temperature and humidity) of outdoor air.

Allows

use

outdoor

air for

free

cooling.

S7666A

Simulator

(Ranco

TEI)

portable

unit

provides

check of

system

by substituting

adjustable

voltage

for

zone

thermostat

and

sensor signals.

T7080A,B

Solld

State,

Dual

Setpoint

Thermostat

(Ranco

TR3, TR4) modulates zone dampers and

supplies

load demand signal to load analyzer. Single voltage ramp

design

has variable, 3 to 30°F

[I.7

16.7%]

dead bard.

For complete T702OA.B information, refer to form number

60-2527,

T7080A

has

built-in

sensor;

T7080B

requires

remote

sensor.

W7080A

Load Analyzer

(Ranco

EA3) provides SPOT

relay

switching of

three

stages

of healing and

three

stages

of cooling and modulating

output

economizer

and valve

motors

in response to highest healing and cooling demand

from

zone

thermostats. Analyzer is source cl 24 Vdc power

for

zone

thermostats

sensors,

and

W7081A

Limit

Controller.

W7081A

Limit

Controller

(Ranco

EA5-G3002)

provides

economizer control in addition to hot and

cold

deok

selec-

table

limik.

Saves

energy by maintaining

selected

tempera-

ture limik of hot and

cold

decks

when

zone

demands

are

reduced.

For

complete

W7081A

information,

refer

form

number W-2512.

W7082A Integrator

Analyzer

(Ranco

EA5-C6001-35)

op-

tional

unit

controls

system

blower

in VAV systems in

response

zone

demand. During

decreased

demand, the

W7082A

reduces

fan

output, thus saving

energy.

(Requires

additional

blower

equipment. not

available

from Honeywell.)

W7083A

Electric

Heat

Seq.

(Replaces

Ranco

EA5-C0501)

optional

unit

switches

up to five ON/OFF

stages

electric

heat,

provides

stage

turn

delay

power restoration.

W7084A

Zom Adder

(Ranco

EA5-C9001,-C9002)

option-

unit

permits

the

addition

of up to

zones

system.

196325s Fourth

Stage

Cooling

Board

(Ranco

EA5-

C9100

optional

unit

permits

addition

of a fourth stage of

coding

system.

ELECTRICAL RATINGS:

Voltage

and

Frequency

Vac,

50/60

HZ.

Maximum

Power

Consumption

W7080A

IO VA;

W7081A, 0.29 VA;

W7082A,

1.5 VA; W7083A,

1.4 VA; W7084A, 3 VA.

Contact

Ratings

(SPDT

pilot

duty

relays)

See

Table

SYSTEM INPUT

SIGNALS:

See

Table

SYSTEM OUTPUT SIGNALS:

See

Table 3.

STAGE DIFFERENTIALS AND THERMOSTAT DEAD

BAND:

See

Figure

Table 1

Relay Contact

Ratings

for

W7080A,

W7083A,

1953258

Voltage Inrush Running

Contact

Vac

VA VA

Normally

open

240

12Oi240

750

Normal

dosed 24 75 30

20/240 240 40

Table 2

System

Input

Signals

Signal (Vdc) From

W7080A 2-22 T7080A,B

W7081A

2-12 (LO) W7080A,

W7084A

12-22 (HI)

W7083A 2-12 W7080A,

W7081A

195325B

12-24

W7080A,

W7081A

M745K,L 14-17

W7081A

M744D, M745G.P 4-7

W7081A

Table 3

System

Output

Signals

From Signal (Vdc)

T7080A 2.22 W7080A,

W7082A,

W7084A,

M734

10.5-13.5 M734

W7080A, 2-12

W7081A,

W7084A (LO)

W7083A,

195325B

W7080A 12-22 W7081A,

W7084A (HI) W7083A,

195325B

W7081A

W7082A

14-17

4-7

-10

M745K.L

M744D,

M745G,P

Inverter

(VAV fan

motor

control

COLD DECK LOW

LIMIT:

Limits

cold

deck

temperature

selectable

setpoints

45°F.

50°F

55°F [7.2°C, 10% or

12.8°C].

HOT DECK

HfGH

LIMIT:

Limits hot

deck

temperature

selectable

setpoints

90°F,

110°F

130°F [32.2°C,

43.3°C

54.4%).

Economizer

motor modulates outdoor air damper

mink

mum

position

when mixed air

temperature

below

setpoint

W7081A

Limit

Controller.

This

setpoint

is selectable

50°F.

55°F

60°F

[10°C,

12.8°C

15.6°C],

with

10°F

[5.6°C]

fixed

throttling

range.

tNTEGRATOR MINIMUM OUTPUT:

Selectable from 0

-8

Vdc

percent

fan

motor

speed).

ZONE DlSCHARGE SENSOR AUTHORITY:

20:1,

which

means

20°F

[11.1°C]

rise

at the

zone

dii

charge

sensor

produces

voltage

change

equal

to a 1°F

[0.5°C]

rise

at the space

thermostat.

AMBIENT TEMPERATURE RISE:

Operating- -40

150°F [-40 to 65°C]

Shipping-

-30

150°F

[-34

65°C]

MOUNTING:

The

W7080A,

W7081A,

W7082A,

W7083A,

W7084A

units

each

attach

with

four

screws

through

mounting holes in the

base (saws not provided). The 195325B Fourth Stage

coding

Board

can

mounted on a Rat

surface.

Sea

in-

dividual specification

sheets

for

mounting

details.

UNDERWRfTERS

LABORATORIES INC.

CCMPONENT

RECOGNIZED:

Fib

number

SA481, Guide number SDFY2D (applies

W7080A, W7083A and 19253258 units

only).

ADDITIONAL SYSTEM COMPONENTS:

C7100B

(13

In.)

Averaging

Temperature

Sensor

One

sensor

hot

deck,

one

sensor

cold

deck

and one

sen-

sor

in mixed

air

to supply

the

three sensor input signals re-

quired

the

W7081A

Limit Controller. Also,

one

sensor

installed in each

zone

discharge duct to

supply

anticipation

the

T7080A

Zone

Thermostat.

Where

space

insufficient

for he 13 in.

[304.8

mm]

probe

of the

C7100B,

the C7046B single point temperature sen-

sor,

with 6 in.

[152.4

mm] probe, may be installed.

1353258

Fourth

Stage

Cooling

Board

Controls

opera-

tion

two

stage

compressor

the

system.

Mounts

separately

from

other

components.

H205A

Enthalpy

Controller

Controls

economizer

opera-

tion in response to

enthalpy

(total

heat

content) of outdoor

air.

Signals

economizer

outdoor

air damper

(or

modulate m minimum

position)

when

enthalpy

above

H205

setpoint

and

open damper on a call for cooling

when

enthalpy

below

setpoint.

Figure 2

Mounting Dimensions for W7080A

W7082A,

W7083A,

W7084A

Units in

Inch

[mm In

brackets]

Nonspring

Return

Motors

M734J,

M744D

have

a solid

state balance relay, operate on 24

Vac,

50/60

Hr.

Spring

Return

Motors

M746G,K,L,P

motors

have

solid-

state

balance

relay, require separate 24 Vac,

50/60

power

supplies.

Time Delay Relays

To improve stability

the

system

and minimize energy

use,

five

minute

turn

on time delays

should

added

all heating and cooling loads.

These

relays should be wired between

cooling

and heating stage

switching outputs

(W7080A

Load

Analyzer

W7083A

Electric

Heat Sequencer and 1953258 Fourth Stage Cooling Board)

and the heating and cooling equipment.

SYSTEM ACCESSORIES:

Transformers: AT20-20 VA; AT7240 VA;

AT88-75

Analyzer can also be

used

power

stage

relays in the

W7083A

Electric

Heat

Sequencer

(if

used).

The

M744

and M745

motors

each

require a separate transformer

ensure

electrical

isolation.

‘NEVER

GROUND

THE I

SECONDARY OF ANY TRANSFORMER USED TO

POWER

ANY

SYSTEM

COMPONENT. I

Q209A

Minimum

Position

Potentiometer

Mounts

direct-

M734,

M744,

M745 motors;

controls

minimum

open

position

of damper.

Q605 Damper Linkage

Connects motor to damper.

in-

cludes motor

crank

arm.

Q618

Valve

Linkage

Connects

Modutrol

motor

modulating hot or chilled

water

valves.

S963A

Remote

Mlnlmum

PositIon

Potentiometer

Provides

remote

manual control

minimum open

position

of economizer

motor.

Modulatlng

Water

Valves

Use appropriate valve with

Super

Modutrol

motor and

Q618

Linkage

provide

propor-

tional

control of hot or chilled

water

flow.

Compressor

Ambient

Lockout

Thermostat

Use

with

direct expansion

cooling

system to prevent compressor

operation when outdoor air temperature falls below

economizer setpoint.

T675A

Temperature Controller.

L6018CTemperatureController.

Economizer Changeover Controller

Holds economizer

at minimum position whenever outdoor air temperature

en-

thalpy is

above

controller setpoint.

H205A1038

H205A1046

Enthalpy

Controller.

T675A

Temperature

Controller.

L6a%cT-nuc-

Nlght

Setback

Provides

heating setback of 6 to

22°F

[3.3

12.2°C].

Requires

connection

of a 1% resistor and

S6005

Time

Clock

contact

conncected

between

Terminals 3,

7 or 6; and 5 of

T7080A

T7080B

Thermostat.

T675A

Tsn~

cammu=

L4o,acT-~Gmu0ua

S43

Sail

Switch

Activates

circuits when minimum

airflow

is maintained in duct. Deactivates circuit

below

minimum

airflow.

1914448 Metal Cover

Designed

protect the

W7080A,

W7081A,

W7082A,

W7083A

and

W7084A

components when

mounted

open

surface.

Overall

dimensions of units

with

metal

cover

place:

in. long,

4+‘1’16

in. wide, 49’w in.

high

[168.3

108.5

122.2 mm].

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