Bryant 580F operation manual EconoMi$erIV Control Modes, Temperature F

LEGEND	Potentiometer Default Settings:
DCV — Demand Controlled Ventilation	Power Exhaust	Middle
	Minimum Pos.	Fully Closed
IAQ — Indoor Air Quality
	DCV Max.	Middle
LALS — Low Temperature Compressor
	DCV Set	Middle
Lockout Switch
	Enthalpy	C Setting
OAT — Outdoor-Air Temperature

POT — Potentiometer

NOTES:

1.620 ohm, 1 watt 5% resistor should be removed only when using differential enthalpy or dry bulb.

2.If a separate field-supplied 24 v transformer is used for the IAQ sensor power supply, it cannot have the secondary of the transformer grounded.

3.For field-installed remote minimum position POT, remove black wire jumper between P and P1 and set control minimum position POT to the minimum position.

Fig. 27 — EconoMi$erIV Wiring

Table 10 — Supply Air Sensor Temperature/

Resistance Values

TEMPERATURE (F)	RESISTANCE (ohms)
–58	200,250
–40	100,680
–22	53,010
–4	29,091
14	16,590
32	9,795
50	5,970
68	3,747
77	3,000
86	2,416
104	1,597
122	1,080
140	746
158	525
176	376
185	321
194	274
212	203
230	153
248	116
257	102
266	89
284	70
302	55

C. EconoMi$erIV Control Modes

Determine the EconoMi$erIV control mode before set up of the control. Some modes of operation may require different sensors. Refer to Table 11. The EconoMi$erIV is supplied from the fac- tory with a supply air temperature sensor, a low temperature compressor lockout switch, and an outdoor air temperature sensor. This allows for operation of the EconoMi$erIV with out- door air dry bulb changeover control. Additional accessories can be added to allow for different types of changeover control and operation of the EconoMi$erIV and unit.

Outdoor Dry Bulb Changeover

The standard controller is shipped from the factory config- ured for outdoor dry bulb changeover control. The outdoor air and supply air temperature sensors are included as stan- dard. For this control mode, the outdoor temperature is com- pared to an adjustable set point selected on the control. If the outdoor-air temperature is above the set point, the EconoMi$erIV will adjust the outdoor-air dampers to mini- mum position. If the outdoor-air temperature is below the set point, the position of the outdoor-air dampers will be con- trolled to provide free cooling using outdoor air. When in this mode, the LED next to the free cooling set point potentiome- ter will be on. The changeover temperature set point is con- trolled by the free cooling set point potentiometer located on the control. See Fig. 28. The scale on the potentiometer is A, B, C, and D. See Fig. 29 for the corresponding temperature changeover values.

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