Adding Foam Strip to Hood Side | Carrier EK, 48EJ, EW, EY024-048

Carrier EK, 48EJ, EW, EY024-048 installation instructions Adding Foam Strip to Hood Side

HOOD SIDE (SLOTTED)

HOOD

TOP

Fig. 28 Ð Adding Foam Strip to Hood Side

BLOCKOFF BAFFLE

GRAY FOAM STRIP

Fig. 29 Ð Adding Foam Strip to Blockoff Baffle

MOUNTING ANGLE (WITHOUT TABS)

FILTER TRACK

ASSEMBLY

Fig. 30 Ð Mounting Angle (Without Tabs) Attached

to Filter Track Assembly

The outdoor-air damper closes. The control allows 90 sec- onds for the damper to close in case it is in the full open position. Next, the indoor-fan contactor will energize. The outdoor-air damper will remain at 0% for 30 seconds. It will then move to the 10% position for another 30 seconds. This will be repeated at every 10% increment for 30 seconds until the damper reaches 100% open. Close DIP switch no. 4 dur- ing the 30 seconds immediately after the desired outdoor air minimum damper position. The 30-second time period is to allow time where DIP switch no. 4 can be closed. The de- fault value of the minimum outdoor air damper position is 20%. If the desired minimum position is 30%, allows the damper position to go to 10% for 30 seconds, then 20% for 30 seconds, and when it reaches 30% close DIP switch no. 4 during the 30-second period following the 30% position.

The minimum outdoor air damper position is now set. Close DIP switch no. 6.

ECONOMIZER SETTINGS

Accessory Enthalpy Control (Fig. 33) Ð The control (HH57AC077) is mounted in the economizer hood. See Fig. 24. The enthalpy setting adjustment is on the enthalpy control. For maximum bene®t of outdoor air, set enthalpy control to A. See Fig. 34 and 35.

Enthalpy Control Installation Ð The outdoor air enthalpy con- trol 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 following procedure:

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

2.Remove the economizer inlet ®lters from the bottom of the right hand economizer hood. See Fig. 24. See Fig. 36 for economizer details.

3.Mount the outdoor air enthalpy sensor inside the right econo- mizer hood on the right side panel of the hood, adjacent 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 (®eld-supplied) on the violet and brown wires.

6.Connect a 1¤4-in. push on terminal (®eld provided) to one end of a 18-gage, 6-in. jumper wire (®eld-provided). Con- nect the other end to the red wire and attach a 1¤4-in. push on connector (®eld 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 ®lters.

9.Return power to unit.

Accessory Differential Enthalpy Control (Fig. 33) Ð The control (HH57AC077), in conjunction with the accessory en- thalpy sensor (HH57AC078), controls economizer opera- tion according to the differential enthalpy. The control is mounted in the economizer hood. The sensor is mounted in the return duct (48EJ/EK) or return air plenum (48EW/EY).

EW, EY024-048, EK, 48EJ specifications

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