Example, Economizer Logic Control Setting

EXAMPLE:

1.Measure return air temperature (RAT) (assume 75° F for example).

2.Measure outdoor air temperature (OAT) (assume 60° F for example).

3.Calculate the mixed air temperature (MAT) which will result from the desired combination of OAT (10 percent) and RAT (90 percent).

.1 OAT + .9 RAT =	MAT
or substituting example values
.1 (60° F) + .9 (75° F)	= 73.75° F

4.Adjust the minimum position potentiometer knob until proper mixed air temperature as calculated above is reached. Care should be taken to insure thermometer is sensing air that is well mixed.

5.Mark correct setting on dial of minimum position potentiometer for future reference.

D.Adjust the economizer logic module to position A, B, C and D to achieve the maximum combination of temperature and humidity acceptable for the installation as per Table 2. The suggested setting is between A & B 70° DB @ 55 percent RH. It is further recommended to always set the

control at C or above.) (See Figure 5.)

E.Switch the thermostat fan control to automatic and position the heat/cool switch to cool.

Adjust the thermostat temperature to engage the first stage of cooling only (Y). This will cause the dampers to modulate to achieve mixed air temperature of 55° provided outside air enthalpy is sufficiently low. If enthalpy is too high for economizing, low enthalpy can be simulated by temporarily removing and jumping leads on terminals 2 and 3 of enthalpy control together. This will also cause the economizer damper to modulate away from minimum position. (Be sure to properly reconnect leads at end of checkout procedure).

F.Readjust temperature on the thermostat to engage the second stage of cooling (Y2). The damper motor should return to previously set minimum position. Compressor motor should start.

G.Switch thermostat to OFF fan and OFF heat/ cool positions to de-energize unit. Economizer damper should return to full closed (100 percent return air) position. Checkout is complete.

14.Replace control access panel and mist eliminator.

15.Remove blank off plate or barometric fresh air damper if installed on the service access panel. Plug the four (4) holes used to mount the BOP or BFAD with the plastic plugs supplied with the economizer.

16.Replace service access panel.

17.Economizer is now ready for operation.

TABLE 2

ECONOMIZER LOGIC CONTROL SETTING

	Dial	20% RH	50% RH	80% RH
	Setting	20% RH	50% RH	80% RH
	Setting

	A	80 deg. F	73 deg. F	66 deg. F
	A	(26 deg. C)	(23 deg. C)	(19 deg. C)
		(26 deg. C)	(23 deg. C)	(19 deg. C)

Enthalpy	B	76 deg. F	70 deg. F	63 deg. F
	B	(24 deg. C)	(21 deg. C)	(17 deg. C)
		(24 deg. C)	(21 deg. C)	(17 deg. C)
Contol
Contol		74 deg. F	66 deg. F	59 deg. F
Setting	C	74 deg. F	66 deg. F	59 deg. F
	C	(23 deg. C)	(19 deg. C)	(15 deg. C)
		(23 deg. C)	(19 deg. C)	(15 deg. C)

	D	71 deg. F	63 deg. F	54 deg. F
	D	(21 deg. C)	(17 deg. C)	(12 deg. C)
		(21 deg. C)	(17 deg. C)	(12 deg. C)

Manual	2100-498B
Page	8 of 17

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