APRILAIRE MODEL 6404 ZONED COMFORT CONTROL PANEL
WIRING DIAGRAM |
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| CONTROL |
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| ZONE 1 | ZONE 2 | ZONE 3 | ZONE 4 | DAMPER | PANEL | HUM | EAC |
| EP_OUT |
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| POWER | POWER | R | B | |||||||
| COM NC NO COM NC NO COM NC NO COM NC NO | C R | R C |
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| C A | |||||
HVAC | B |
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O |
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| W2 |
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EQUIPMENT | Y2 |
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W1 |
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| Y1 |
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| G |
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| RH |
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| RC |
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| POWER | |
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| R |
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| HUM |
| C |
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ZONE1 |
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| FUSE |
| LED’s |
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O |
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| W |
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| Y |
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| EAC |
| B |
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| VISIBLE |
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| R |
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| G |
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| HEATING |
ZONE 2 ZONE3 | 2S | THERMOSTATCONNECTIONS |
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| THROUGH THEENCLOSURE |
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2S | B | A |
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| COOLING | |||
| C |
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| W |
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| Y |
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| ON OFF |
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| FAN ON |
| O |
| ZONE 1 | ANY ZONE |
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| G |
| HEAT PUMP | HEAT/COOL |
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| 2S |
| ELECTRIC | GAS |
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| NO PURGE | PURGE |
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| VAC | ||
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| ON OFF |
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| C | T.D.O. | D | C | #ZONES TO STAGE |
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| W | B | A |
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| 45 | CL:40 | PLENUM SENSOR |
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| Y |
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| (TIME DELAY | 140 | HT:170 |
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| O |
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| OVERRIDE) |
| ON OFF |
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| ZONE 1 | |
| G |
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| D | C | STAGE MINUTES |
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| R |
| D | C | AUX. MINUTES |
| ZONE 2 | |
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| B | A |
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| C |
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ZONE | W |
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Y |
| SPARE FUSE |
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| ZONE 3 | ||
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4 | O |
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G | PLENUM |
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| ZONE/VAC |
| ZONE 4 | ||||
| 2S | SENSOR |
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| SELECTOR | SELECTOR |
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| OFF/ON | OFF/ON |
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CONTROL PANEL
TERMINAL DESIGNATIONS
R24V (hot) Thermostat voltage
C 24V (com)
G Fan (thermostats and equipment)
Y/Y1 | 1st Stage Cooling or Compressor |
| (thermostats and equipment) |
W/W1 | 1st Stage Heat or Auxiliary Heat |
| (thermostats and equipment) |
Y2 | 2nd Stage Cooling or Compressor |
| (equipment) |
W2 | 2nd Stage Heat or Emergency Heat |
| (equipment) |
OReversing
B Reversing
2S 2nd Stage Heat and/or 2nd 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 |
PRODUCT SPECIFICATIONS
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| RATED VOLTAGE |
| 20 to 30 VAC |
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| 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 |
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| HIGH LIMIT TEMPERATURE |
| Selectable between 140˚F and 170˚F |
| PLENUM SENSOR |
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| LOW LIMIT TEMPERATURE |
| Selectable between 40˚F and 45˚F |
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TRANSFORMER
REQUIREMENTS
| MAX. # OF |
| POWERED |
REQUIRED VA | DAMPERS |
40 | 3 or Less |
75 | 4 thru 6 |
40 per 3 Dampers | 7 or more |
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ADDITIONAL INSTALLATION FEATURES
• 45 degree angled terminals | • Fuse protection with extra fuse |
• Enclosure accommodates wiring from the side or rear | • Convenient control of |
• Wiring diagram on front cover | • Selectable - any zone sets mode or zone 1 sets mode |
• Available common terminal for 24 volt powered stats | • |
• Compatible with | electric or fossil fuel furnaces |
PO Box 1467 • Madison, WI
Form No. 5034 50.06.04 Printed in U.S.A. | ©2004 Research Products Corporation |
