Aprilaire 8346 User's Guide download pdf (Page 30)

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Control Panel Wiring Diagrams

APRILAIRE MODEL 6404 CONTROL PANEL

CONTROL PANEL

TERMINAL DESIGNATIONS

RATED VOLTAGE 20 to 30 VAC

RATED CURRENT 3 amp

FUSE RATING 3 amp, slow blow fuse

MAXIMUM AMBIENT TEMPERATURE 140˚F

RH AND RC TERMINALS Independent heat and cool relays for

2 transformer systems

PLENUM SENSOR

HIGH LIMIT TEMPERATURE Selectable between 140˚F and 170˚F

PLENUM SENSOR

LOW LIMIT TEMPERATURE Selectable between 40˚F and 45˚F

PRODUCT SPECIFICATIONS

ADDITIONAL INSTALLATION FEATURES

MAX. # OF

POWERED

REQUIRED VA DAMPERS

40 3 or Less

75 4 thru 6

40 per 3 Dampers 7 or more

TRANSFORMER REQUIREMENTS

• 45 DEGREE ANGLED TERMINALS

• ENCLOSURE ACCOMMODATES WIRING FROM THE SIDE OR REAR

• WIRING DIAGRAM ON FRONT COVER

• AVAILABLE COMMON TERMINAL FOR 24 VOLT POWERED STATS

• COMPATIBLE WITH POWER-STEALING THERMOSTATS

• FUSE PROTECTION WITH EXTRA FUSE

• CONVENIENT CONTROL OF EMERGENCY HEAT THROUGH

THERMOSTAT OR ON BOARD SWITCH

• SELECTABLE - ANY ZONE SETS MODE OR ZONE ONE SETS MODE

• ELECTRIC/NON-ELECTRIC SELECTABLE - PROPER CONTROL

OF THE FAN (G-TERMINAL) FOR EITHER ELECTRIC OR FOSSIL

FUEL FURNACES

FUSE - 3A

SPARE FUSE

ZONE 1 ZONE 2 ZONE 3 ZONE 4HVAC EQUIPMENT

PLENUM

SENSOR

T.D.O.

(TIME DELAY

OVERRIDE)

EACHUM

DAMPER

POWER

C R

CONTROL

PANEL

POWER

R C R C A B

ZONE 1

COM NC NO

EP_OUT

ZONE 2

COM NC NO

ZONE 3

COM NC NO

ZONE 4

COM NC NO

LED’s VISIBLE THROUGH THE ENCLOSURE

POWER

HUM

EAC

HEATING

COOLING

FAN ON

VAC

E-HEAT

ZONE 1

ZONE 2

ZONE 3

ZONE 4

ZONE/VAC

SELECTOR

OFF/ON

E-HEAT

SELECTOR

OFF/ON

THERMOSTAT CONNECTIONS

PLENUM SENSOR

OFFON

CL:40

HT:170

140

#ZONES TO STAGE

OFFON

STAGE MINUTES

AUX. MINUTES

HEAT/COOL

OFFON

ANY ZONE

GAS

PURGE

ZONE 1

HEAT PUMP

ELECTRIC

NO PURGE

R 24V (hot) Thermostat voltage

C 24V (com) T-stat (if required) &

damper voltage

G Fan (thermostats and equipment)

Y/Y1 1

Stage Cooling or Compressor

(thermostats and equipment)

W/W1 1

Stage Heat or Auxiliary Heat

(thermostats and equipment)

Y2 2

Stage Cooling or Compressor

(equipment)

W2 2

Stage Heat or Emergency Heat

(equipment)

O Reversing Valve—Cool

B Reversing Valve—Heat

2S 2

Stage Heat and/or 2

Stage Cool

(thermostats)

NC Normally closed damper output

NO Normally open damper output

24VAC Voltage source for control panel,

thermostats and dampers

RH Heating transformer—24V (hot)

RC Cooling transformer—24V (hot)

HUM Auxiliary relay active w/ heat calls

EAC Auxiliary relay active w/ blower

operation

A&B Expansion panel connections

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Aprilaire 8346 User's Guide Page 30

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