Duct-Mounted Relative Humidity Sensor Ð The duct-mounted relative humidity sensor and mounting tem- plate are packaged and shipped inside the fan section. The sensor is installed in either the return air ductwork or in the outside air ductwork. If 2 relative humidity sensors are or- dered for differential enthalpy control, then the sensors must be installed in both the return air and outside air ducts. If the sensor is used for control of a humidi®er, install the sensor in the return air duct.

The PIC controller has a return air relative humidity de- fault set point of 40%.

LOCATION FOR OUTSIDE AIR RELATIVE HUMIDITY

ÐLocate the sensor where it accurately measures outdoor conditions, yet is protected from the elements. During the unoccupied (fan off) period, the sensor's location should have a minimal effect on its readings.

LOCATION FOR RETURN AIR RELATIVE HUMIDITY

ÐLocate the sensor at least 6 in. upstream or 15 in. down- stream of a 90 degree turn in the ductwork. The best loca- tion is 15 in. downstream of the 90 degree turn of the duct. The probe should be mounted in the center of the duct. See Fig. 33.

Mount the relative humidity sensor (Fig. 34) as follows.

1.Position mounting template on duct.

2.Drill four 1¤8-in. mounting holes as indicated on the template.

3.Punch a 11¤8-in. hole as indicated on the mounting template.

4.Mount sensor to duct using four no. 8 screws. Install 9-in. sensor probe into the 11¤8-in. hole.

Never attempt to clean or touch the sensing element with chemical solvents, as permanent damage to the sensor will occur.

Mixing Box Linkage Ð On units with mixing box (MXB) or ®lter mixing box (FMB), the actuator and linkage are fac- tory installed. The actuator is directly linked to the outdoor- air damper and holds the damper closed. No adjustment is necessary.

For shipping purposes, the secondary linkage rod con- necting the outdoor-air and return-air dampers is factory set for a closed return-air damper.

Adjust the secondary linkage as follows:

1.Open the door of the MXB or FMB to access the return air damper crankarm.

NOTE: On MXB/FMB with top outdoor-air damper, it may be necessary to remove the vertical panel holding the return-air damper to access the return-air damper crankarm.

2.Loosen the setscrew on the return-air damper crankarm.

3.Move the damper to its full open position.

4.Secure the setscrew on the return-air damper crankarm.

5.Close the MXB or FMB access door.

Fig. 33 Ð Duct-Mounted Relative Humidity

Sensor Locations

Fig. 34 Ð Duct-Mounted Relative Humidity Sensor

(P/N HL39ZZ002) Installation

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Carrier 39L specifications Duct-Mounted Relative Humidity Sensor Locations

39L specifications

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