Bryant 551C 551B,C, Outside Air Temperature, Changeover Set Points, Sensor Mounting Location

19

	18	LED ON
				D
	17
	16		LED OFF		LED ON
						C
	15
mA	14				LED OFF			LED ON
									B
	13
	12							LED OFF		LED ON
	11											A
	10										LED OFF
	9		50										100
	40	45		55	60	65	70	75	80	85	90	95

DEGREES FAHRENHEIT

C06035

ECONOMI$ER IV

ECONOMI$ER IV CONTROLLER

GROMMET

RETURN AIR

SENSOR

RETURN DUCT (FIELD-PROVIDED)

Fig. 34 ---Outside Air Temperature

Changeover Set Points

C06036

Fig. 35 ---Return Air Temperature or Enthalpy

Sensor Mounting Location

																						85		90	95	100		105	110
																						(29)		(32)	(35)	(38)		(41)	(43)
																			46
CONTROL	CONTROL POINT																4
CURVE APPROX. deg. F (deg. C)																	4
													42							80
	AT 50% RH
A	73 (23)									AIR										(27)
												40
B	70 (21)																										(%)
C	67 (19)									DRY	8														HUMIDITY
D	63 (17)							POUND		3
									36
																			75
							PER											(24)
								4
								3
				BTU																				RELATIVE
							32
																70
					30
														(21)
			28
															0
	ENTHALPY												1	0			0
		26										65				9		80
	4											(18)							70
	2																				0
	2																			6
	2									60											50
	0									(16)
	2										A											4	0
8								55
1								(13)		B														30
6
1							50
4								C
						(10)
1																										20
2			45				D
1			(7)
		40
																													0
		(4)
																													1
	35
	(2)
																			D C		B	A
																													HIGH LIMIT
																													CURVE
	35	40	45				50	55		60		65				70			75		80	85		90	95	100		105	110
	(2)	(4)	(7)				(10)	(13)		(16)		(18)				(21)			(24)		(27)	(29)		(32)	(35)	(38)		(41)	(43)
	APPROXIMATE DRY BULB TEMPERATURE--degrees F (degrees C)

C06037

	Fig. 36 ---Enthalpy Changeover Set Points
Occupancy Control	Demand Controlled Ventilation (DCV)

551B,C

The factory default configuration for the EconoMi$er IV control is occupied mode. Occupied mode is provided by the black jumper from terminal TR to terminal N. When unoccupied mode is desired, install a field-supplied timeclock function in place of the jumper between TR and N. (See Fig. 27.) When the timeclock contacts are closed, the EconoMi$er IV control will be in occupied mode. When the timeclock contacts are open (removing the 24-v signal from terminal N), the EconoMi$er IV will be in unoccupied mode.

When using the EconoMi$er IV for demand controlled ventilation, there are some equipment selection criteria which should be considered. When selecting the heat capacity and cool capacity of the equipment, the maximum ventilation rate must be evaluated for design conditions. The maximum damper position must be calculated to provide the desired fresh air.

Typically the maximum ventilation rate will be about 5 to 10% more than the typical cfm required per person, using normal outside air design criteria.

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