Aprilaire 6303 Wiring Diagram, Aprilaire, Outdoor Unit, ZONE 1 THERMOSTAT, 1ZONE, Model, Symptom

	TROUBLESHOOTING
SYMPTOM	CAUSE
Normal Flashing LED not flashing	No power to control panel - check power wiring
No Heat call or Cool call	- TSTATS not operating properly. If Zone 1 is set up as a heat pump thermostat, it requires an O + Yfor cool call
	and Y for a heat call.
	- 4 minute minimum off time delay in effect - push TDO
	- Missing jumper between equipment RH&RC - required for single transformer systems
	- Equipment interrupt due to high/low temperature limit
	- Heat/Cool Changeover limit in effect and an opposing call is being answered in another zone
Won't stop calling	Minimum on time delay in effect (2 minutes for heat, 4 minutes for cool)
Heat calls being satisfied with Emergency Heat	- Heat Pump TSTAT installed in Zone 1: If Zone 1 is in Emergency Heat mode, all heat calls from other zones will be
	satisfied with Emergency Heat until Zone 1 makes a compressor call (normal heat or cool call).
	- Onboard E-HEAT switch is in the ON position and all calls for heat answered with Emergency Heat
No Emergency Heat Call	- Zone 1 W terminal not energized or energized with Y terminal
	- Onboard E-HEAT switch in the OFF position (Heat/Cool TSTATS installed in all zones)

6303 WIRING DIAGRAM

RECOMMENDED HEAT PUMP THERMOSTATS

(ZONE 1 ONLY) Aprilaire® 8346: non-programmable Aprilaire® 8365: 5/2 day programmable Aprilaire® 8570: 7 day programmable

CONTROL PANEL SET UP

1. Set Z1 HC/Z1 HP pin jumper block to the left two pins (Z1 HC) if installing a heat/cool thermostat in Zone 1. Set the pin jumper block to the right two pins (Z1 HP) if installing a heat pump thermostat in Zone 1 for thermostat control of Emergency Heat. 2. Set GAS/ELECTRIC pin jumper block to the right two pins (ELECTRIC) for most installations. This will energize the Fan (G equipment terminal) with an Auxiliary or Emergency Heat Call (W). Set the pin jumper block

OUTDOOR UNIT

LOW VOLTAGE CONTROL ONLY to the left two pins (GAS) if the auxiliary heat source is gas (or propane or oil).

		Zone 2)
ZONE 1 THERMOSTAT	HEAT PUMP THERMOSTAT	Heat/Cool thermostat, wire same as			COOL or HEAT
			EHEAT COOL			AUTO FAN
			L O B HEAT	OFF		FAN ON	OFF	1ST	STAGE
							COOL
					W2 Y G	R X	HEAT
							EHEAT
							OPTIONAL
		(If
						REQUIRED

thetoblockjumperpinPURGEPURGE/NOtheSet3.left two pins (PURGE) if it is desired to have the zone endtheatcyclepurgesecond60acontrolpanelcontrolof a cool call or electric heat call. Set the pin jumper

controlequipmentifPURGE)(NOpinstworightthetoblock of the purge cycle is desired. twoleftthetoblockjumperpin160/120-HTtheSet4.pins (Ht-160) to cut out the heating equipment at 160°F to jumperpin160/120-HTtheSetoverheating.preventblock to the right two pins (Ht-120) to cut out the heating

120°F.atequipment pinstwoleftthetoblockjumperpin45/40-CLtheSet5.(CL-45) to cut out cooling equipment at 45°F to prevent blockjumperpintheSetcoil.coolingindoorthefreezingto the right two pins (CL-40) to cut out cooling

40°F.atequipment handleftlowertheinswitch,HEAT-EthethatEnsure6.corner of the control panel, is in the off position.

systemthecheckouttoOperationofSequencetheFollow7. after installation. Push and hold the TDO button to delays.timeinbuiltavoidandclockinternaltheupspeed

Aprilaire

ANDPUMPHEATSTAGESINGLETYPICALWITHSHOWNONE STAGE OF SUPPLEMENT HEATDAMPER

OUTPUTSEQUIPMENT

CONNECTION.COMMONB ZONE 1

O

G

Y

W2

RC

RHNORMAL FLASHING

1ZONE

(COMMON)24V

(HOT)24V

HEATAUXILIARY

COMPRESSOR

FAN

COOL-VALVEREV.

1ZONE

NC NO C R W Y G O

PANEL

1ZONE TSTAT INPUTS

CONTROL

DAMPER INPUTS

6303

A 24V

MODEL

IS NOT

®

TERMINAL

T.D.O.

B

		C
	DEFROST	W	AIR HANDLER LOW VOLTAGE CONTROL ONLY	G	Y	W2	C
1ST STG COMP.	REV REV VALVE VALVE COOL HEAT	O Y B		FAN RELAY	COMP.	AUX.HEAT/ EMERG. HEAT	24

RECOMMENDEDTHERMOSTATSHEAT/COOL	(ZONES3)1-	Aprilaire®programmable8344: non-	Aprilaire®programmable8363: 5/2day Aprilaire®programmable8570: 7 day		THERMOSTATZONE 2	MUSTTHERMOSTATNOT BEPUMPHEAT		AUTO FAN	1ST	STAGE COOL
								R OPTIONAL X FAN ON
									OFF
									COOL
									HEAT
							W Y G			STAGEHEAT1ST
		24V (COMMON)	24V (HOT) HEAT	COOL	FAN

2

DELAY(TIME OVERRIDE)

ZONE

HCZ1HPZ1

ELECTRICGAS

PURGE

ZONE 2

4045-CL

SENSOR

3A

installedbemust

the

DAMPERWIRING NOTE

AMOUNTMAXIMUMTHE OF CURRENT THAT

SWITCHEDBECANTHROUGH THE ZONE IFAMPS.3ISPANELMORE THAN 6

INSTALLTIME, DEDICATED DAMPER

TRANSFORMERSAND A MODEL 8028 DAMPERPOWER DISTRIBUTION PANEL.

ACCORDINGWIRE TO THE INSTRUCTIONS

PROVIDEDWITH THE MODEL 8028.

3ZONE

DAMPER INPUT

S

160-HT1203ZONE

TSTAT INPUT

FUSESPARE

ON OFF

8052

Sensor

POWEREDDAMPERSCOULDONEBEAT

NC

NO

C

R

W

Y G

TSTAT INPUTS

2ZONE

DAMPER

INPUTS

PLENUM

NO PURGE

VAC NC

JUMPERINSTALLEDFIELD

SINGLEFORREQUIREDC

SYSTEMSTRANSFORMER

FUSE -

TRANSFORMER

TRANSFORMER24VACSEPARATEUSE - DO control panel

TRANSFORMERSYSTEMHVACUSENOT

REQUIREDPOWEREDOF#MAX

TRANSFORMERDAMPERS

40LESSOR3VA

756THRU4VA

40MOREOR7VA per 3 DAMPERS

NOTEWIRINGDAMPER(SEEIF 7 OR MORE)

VAC

W

Y S

G

E-HEAT

12024

VACVAC

prior to powering up

24V

AC

ZONE3

NO

R

Sensor

R

L1

120

L2

10006007 11.05	P.O. BOX 1467 • MADISON, WI 53701-1467	©2005 Research Products Corporation
B2203179C	Call toll-free 1-800/334-6011 • Fax 608/257-4357	Printed in USA