Aprilaire 1770A, 1750A installation instructions VENTILATION oR Air Cycling continued

VENTILATION oR Air Cycling (continued)

SETTING DIP SWITCHES & CYCLE TIME TO MEET VENTILATION REQUIREMENTS

Figure 21 – VENT-TIMED DIP Switch Settings Figure 22 – VENT-AUTO DIP Switch Settings

SYSTEM SETUP				SYSTEM SETUP
LOCAL	1	ON	EXTERNAL	LOCAL	1	ON	EXTERNAL
HVAC FAN OFF	2		HVAC FAN ON	HVAC FAN OFF	2		HVAC FAN ON
WHL HOUSE	3		CONVERTIBLE	WHL HOUSE	3		CONVERTIBLE
VENT-AUTO	4		VENT-TIMED	VENT-AUTO	4		VENT-TIMED

CYCLE PERIOD			CYCLE PERIOD
1	ON	30 MIN.	1	ON	30 MIN.
2		1 HOUR	2		1 HOUR
3		2 HOUR	3		2 HOUR
4		3 HOUR	4		3 HOUR

	30		30
	MIN.		MIN.
0	60	0	60
MIN	MIN.	MIN	MIN.
OFF	TEST	OFF	TEST
CYCLE TIME		CYCLE TIME
	90-1538		90-1538

Switch Notes:

•Setting the Cycle Time ≥ Cycle Period will result in constant ventilation..

•Setting the Cycle Time to OFF will disable ventilation.

1.Set VENT-AUTO and VENT-TIMED switch.. VENT-AUTO restricts ventilation based on outdoor temperature (incoming air conditions) and VENT-TIMED allows ventilation regardless of outdoor air conditions.. The VENT-AUTO configuration requires the installation of the Model 8052 outdoor temperature sensor (ODT)..

2.Set the Cycle Period by moving the 1/2, 1, 2, or 3 hour switch to the ON position.. The Cycle Period is the time over which a ventilation cycle will occur.. The default position is 1 hour..

3.Set the Cycle Time, determined in Table 5, by rotating the potentiometer between 0 minutes and 60 minutes.. The Cycle Time determines how long during each Cycle Period ventilation will occur.. Once the ventilation time requirement is met, ventilation will not occur until the next cycle period..

OUTDOOR TEMPERATURE SENSOR INSTALLATION

The ODT should be installed outside in a shaded location (see Figure 23), or in the outside intake ventilation duct (see Figure 24)..

Figure 23 – ODT Mounted Outside

	NORTH, EAST
	OR WEST SIDE	OUTDOOR
	OF HOME	TEMPERATURE
		SENSOR
		SENSOR
		SENSOR
OUTDOOR		BRACKET
	ABOVE EXPECTED
TEMPERATURE SENSOR
LEADS	SNOW LINE

Figure 24 – ODT Mounted in Intake Duct

CENTER LINE

36" MAX.

OUTSIDE WALL

B2202617-D

B2202617-E

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