D. Accessory Installation
At this time any required accessories should be installed on
the unit. Refer to Table 4 for available accessories.
E. Outdoor-Air Inlet Adjustments
Manual Outdoor-Air Damper
All units (except those equipped with a factory-installed
economizer) have a manual outdoor-air damper to provide ven-
tilation air. Damper can be preset to admit up to 25% out-
door air into return-air compartment. To adjust, loosen se-
curing screws and move damper to desired setting. Then
retighten screws to secure damper (Fig. 15).
Optional Economizer
The economizer control location is shown in Fig. 16. For maxi-
mum benefit of outdoor air, set economizer motor control mod-
ule to the ‘‘D’’setting (Fig. 17). The economizer motor control
module is located on the economizer motor. See Fig. 18.
Damper Vent Position Setting
1. Set fan switch at ON position (continuous fan opera-
tion) and close night switch if used.
2. Set system selector switch at OFF position.
3. Turn damper adjustment knob located on economizer mo-
tor control module clockwise slowly until dampers as-
sume desired position. Do not manually operate econo-
mizer motor since damage to motor will result.
Table 3 — Heat Anticipator Settings
UNIT 542J VOLTAGES kW STAGE 1 STAGE 2
150
208/230
14/19 .40 —
26/34 .40 .40
42/56 .66 .40
460
15 .40 —
32 .40 .40
55 .40 .66
180
208/230
26/34 .40 .66
42/56 .66 .40
460
32 .40 .40
55 .40 .66
Table 4 — Accessory List
ACCESSORY
Integrated Economizer with Hood
Electric Heat
Two-Position Damper
Barometric Relief Damper
Roof Curbs (Horizontal and Vertical)
Horizontal Adapter
Thermostats and Subbases
Power Exhaust
Head Pressure Control Device
Low-Ambient Kit
Time GuardT II Control Circuit
Enthalpy Control Sensor
Emergency Heat Package
NOTES:
1. Heater kits include single-point connection wiring.
2. See Trade Prices or contact your local representative for accessory part
numbers.
Fig. 15 — 25% Outdoor-Air Section Details
Fig. 16 — Economizer Damper Assembly — End View
LED — Light-Emitting Diode
Fig. 17 — Economizer Motor Control Module
—11—
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