10.Connect leads with fork terminal to corresponding points on terminal strip. RE: C.Y.G. (See wiring diagram.)
11.Wire nut leads with 5/8" stripped ends to Y1 and Y2 leads from thermostat. See wiring diagram in this manual.
NOTE: Wires referenced in note one on wiring diagram are for special control application only and are not normally used in conjunction with other circuitry to open the damper regardless of outside temperature and humidity. Consult factory for details.
12.Close control panel cover
13.Reinstall the blower access panel at top of unit and secure with sheet metal screws.
14.Replace filter and screws in front condenser grille.
15.ECONOMIZER CHECK OUT
A.Remove mist eliminator (Figure 2). Locate the minimum position potentiometer (See Figure 4).
B.Energize the evaporator blower by switching thermostat to the manual fan position with heat/cool in the OFF position.
C.Cycle the minimum position potentiometer (factory set for 0% fresh air) 0 to full open. (See Figure 3.) Throughout checkout procedure observe operation of damper to insure there is free, unobstructed operation through the entire angle of damper travel. Then adjust the damper minimum open position to meet local codes or application requirements. See example below.
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 enthalpy control to position A, B, C and D to achieve the maximum combination of temperature and humidity acceptable for the installation as per Table 2 below. 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 4.)
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 terminal 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).
TABLE 2
ENTHALPY CONTROL SETTINGS
| Dial |
|
|
| |
| Setting | 20% RH | 50% RH | 80% RH | |
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| |
| A | 80 deg .F | 73 deg. F | 66 deg. F | |
| (26 deg. C) | (23 deg. C) | (19 deg.C) | ||
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| |
Enthalpy | B | 76 deg. F | 70 deg. F | 63 deg. F | |
(24 deg. C) | (21 deg. C) | (17 deg. C) | |||
Control |
| ||||
| 74 deg. F | 66 deg. F | 59 deg. F | ||
Setting | C | ||||
(23 deg. C) | (19 deg. C) | (15 deg. C) | |||
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|
| |
| D | 71 deg. F | 63 deg. F | 54 deg. F | |
| (21 deg. C) | (17 deg. C) | (12 deg. C) | ||
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