Carrier 48AY020-060, 48EW, 48EY024-068 Mounting Angle With Tabs Attached to Filter Track Assembly

MOUNTING ANGL (WITHOUT TABS)

FILTER TRACK

ASSEMBLY

Fig. 43 — Mounting Angle (Without Tabs)

Attached to Filter Track Assembly

MOUNTING ANGLE (WITH TABS)

Fig. 44 — Mounting Angle (With Tabs) Attached to

Filter Track Assembly

BLACK SEAL STRIP (CENTERED)

FILTER COVER

Fig. 45 — Attaching Seal Strip to Filter Cover

ECONOMIZER SETTINGS

Accessory Enthalpy Control (Fig. 46) — The control (HH57AC077) is mounted in the economizer hood. See Fig. 37. The enthalpy setting adjustment is on the enthalpy con- trol. For maximum benefit of outdoor air, set enthalpy control to A. See Fig. 47 and 48.

The enthalpy controls operation of the economizer outdoor- air damper to provide free cooling on a signal form the cooling thermostat.

Enthalpy Control Installation — The outdoor air enthalpy control is installed on the inside panel of the outdoor air hood. The enthalpy control should be mounted when the outdoor air hoods are assembled. To install the control, perform the follow- ing procedure:

1.Turn off all power. Ensure disconnect is locked out.

2.Remove the economizer inlet filters from the bottom of the right hand economizer hood. See Fig. 37. See Fig. 49 for economizer details.

3.Mount the outdoor air enthalpy sensor inside the right economizer hood on the right side panel of the hood, ad- jacent to the outdoor-air thermistor.

4.Locate the red, violet, and brown wires near the outdoor air thermistor. Remove the splice from the red and violet wires. Remove the cap from the brown wire.

5.Install a 1/4-in. push on terminal (field-supplied) on the vi- olet and brown wires.

6.Connect a 1/4-in. push on terminal (field-provided) to one end of a 18-gage, 6-in. jumper wire (field-provided). Connect the other end to the red wire and attach a 1/4-in. push on connector (field-provided).

7.Connect the red wire with the jumper to terminal TR1. Connect the jumper to terminal 2. Connect the brown wire to terminal TR. Connect the violet wire to terminal 3. All connections are on the enthalpy control.

8.Replace the economizer filters.

9.Return power to unit.

Accessory Differential Enthalpy Control (Fig. 46) — The control (HH57AC077), in conjunction with the accessory en- thalpy sensor (HH57AC078), controls economizer operation according to the differential enthalpy. The control is mounted in the economizer hood. The sensor is mounted in the return duct (48AJ,AK and 48EJ,EK) or return air plenum (48AW,AY and 48EW,EY).

Differential Enthalpy Sensor Installation — To install the control, perform the following procedure:

1.Turn off all power. Ensure disconnect is locked out.

2.Remove the economizer inlet filters from the bottom of the right hand economizer hood. See Fig. 37 and 49.

3.Remove the factory-installed, 620-ohm jumper between terminals SR and + on the enthalpy control located inside the outdoor air hood.

4.Connect the violet wire from the enthalpy sensor kit to the + terminal on the enthalpy control. Connect the blue wire from the enthalpy sensor kit to the SR terminal on the enthalpy control.

5.Turn the enthalpy control set point potentiometer clock- wise past the ‘‘D’’ setting on the enthalpy control to con- figure the control to operate on differential enthalpy. See Fig. 47.

6.Remove the return-air enthalpy sensor from the accessory package. Using the screws provided, mount the sensor in- side the return duct near the unit. Do not locate the control too far from the unit, or the wires will not reach from the sensor to the control. On 48AW,AY and 48EW,EY units, the enthalpy sensor can be installed in the return air sec- tion of the unit, under the return air dampers.

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