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48/50HG AND 48/50PG20-28 UNITS

NOTE: For horizontal applications it is easiest to install the

enthalpy sensor prior to making duct connections.

1. Remove the damper motor access panel at the return end

of the unit. Save the screws for use later.

2. Mount the enthalpy switch to the economizer frame as

shown in Fig. 3, using the two screws provided.

3. From the unit harness assembly, locate the three enthalpy

wires (red, brown, and pink). Connect the red wire to

terminal 24VAC on the enthalpy switch. Connect the

brown wire to terminal GND on the enthalpy switch.

Connect the pink wire to terminal LOW on the enthalpy

switch. See Fig. 2.

4. If the accessory differential enthalpy control is also being

installed, install the accessory instead of performing the

following steps. See Differential Enthalpy Control Instal-

lation section on page 3.

5. Replace the damper motor access panel using the screws

saved from Step 1.

6. Restore power to the unit and configure the unit for use

with the accessory. See Configuring the Control System

sectiononpage5.

Prior to installation of this accessory, make sure all power

is disconnected to the unit and locked out. Failure to

disconnect power supply prior to servicing may result in

serious injury.

When removing panels from the unit, be careful not to

damage the roof or other surfaces with the panels.

IMPORTANT: Be sure all seal strips and RTV sealant

are intact. A watertight seal to inside of unit must be

maintained.

PLUG BUTTON

ENTHALPY

SWITCH

NOTE: Vertical economizer is shown.

Fig. 1 — Enthalpy Switch Installation — 48/50PG03-16

Fig. 2 — Enthalpy Switch Details

HARNESS

WIRES

ENTHALPY

SWITCH

Fig. 3 — Switch Installation — 48/50HG and

48/50PG20-28 Units

1 2 3 4 5 6 7 8

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