Product guide

G o t o w w w . a p r i l a i r e p a r t n e r s . c o m t o o r d e r l i t e r a t u r e o r d o w n l o a d p r o d u c t d o c u m e n t a t i o n .
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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
• 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
G
RH
RC
Y1
W1
Y2
W2
O
B
G
2S
O
B
Y
W
C
R
2S
G
O
Y
W
C
R
2S
G
O
Y
W
C
R
2S
G
O
Y
W
C
R
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 CRCAB
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
A
OFFON
C
CL:40
HT:170
D
B
45
140
#ZONES TO STAGE
A
OFFON
C
C
A
D
B
D
B
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
st
Stage Cooling or Compressor
(thermostats and equipment)
W/W1 1
st
Stage Heat or Auxiliary Heat
(thermostats and equipment)
Y2 2
nd
Stage Cooling or Compressor
(equipment)
W2 2
nd
Stage Heat or Emergency Heat
(equipment)
O Reversing Valve—Cool
B Reversing Valve—Heat
2S 2
nd
Stage Heat and/or 2
nd
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
MAX. # OF
POWERED
REQUIRED VA DAMPERS
40 3 or Less
75 4 thru 6
Recommend the 8028 7 or more
Damper Power
Distribution Panel
TRANSFORMER REQUIREMENTS