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manual abstract
See Fig. 16. When the OAT is above disable this feature, turn the potentiometer counterclockwise this set point, the damper is limited to minimum position (CCW) to the OFF position. Otherwise, set the value between setting. 10 and 60 F. Mechanical cooling will not operate when the out- If a potentiometer fails, its setting will default to the values door air temperature is below this value. See Fig. 16. in Table 6. Table 4 — EconoMi$er Switchover Control Strategy ECONOMI$ER SWITCHOVER SENSORS REQUIRED STRATEGY Outdoor Air Temperature Outdoor Air Enthalpy Return Air Temperature Return Air Enthalpy Dry Bulb X Single Enthalpy X Differential Temperature X X Differential Enthalpy* X X *Must be selected manually. Table 5 — Changeover Set Points Table 6 — Default Potentiometer Settings SETTINGS A B C D Dry Bulb (°F) 73 69 66 63 Single Enthalpy* (Btu/lb) 27 25 24 22 Differential Temperature* (°F, Not Adjustable) 2 2 2 2 Differential Enthalpy* (Btu/lb, Not Adjustable) 1 1 1 1 POTENTIOMETER DEFAULT SETTING CO2 SP (PPM) 1,000 MECH CLG LOCKOUT 50 F ECON SP D MIN POS (%) 20 *Field-installed accessory. LEGEND COM — Common DAT — Discharge Air Thermistor DM — Damper Motor GND — Ground OAH — Outdoor-Air Enthalpy Sensor OAT — Outdoor-Air Temperature Sensor POT — Potentiometer RAH — Return-Air Enthalpy Sensor RAT — Return-Air Temperature Sensor REM — Remote *OAT sensor shipped with economizer option. OAH, RAT, RAH and CO2 are field-installed accessories. Fig. 23 — Typical EconoMi$er Sensor Wiring 14 VENTILATION AIR (Minimum Position Set Up) — If ventilation air is not required, skip this section. If ventilation air is required, perform the following: 1. The indoor fan must be on to set the ventilation air. Either put the thermostat in the continuous fan mode or jumper the R and G terminals at the rooftop unit connection board. 2. Locate the minimum position (MIN POS) potentiometer. Turn the potentiometer full CCW to fully close the outdoor air dampers. Turn the potentiometer gradually clockwise (CW) to the desired position. See Fig. 16. 3. Replace the filter access panel. See Fig. 18. Ensure the filter access panel is securely engaged. 4. Calculate the minimum airflow across the EconoMi$er. a. Calculate % of outside air using the following formula. % Outdoor air through EconoMi$er Mixture Temp – Return Air Temp % Outdoor air = Outdoor Temp – Return Air Temp b. Multiply total CFM by percentage outdoor air, this gives outdoor air volume in CFM. Personal Injury Hazard. Avoid possible injury by keeping fingers away from damper blades. Step 9 — Install All Accessories — After all the factory-installed options have been adjusted, install all field- installed accessories. Refer to the accessory installation instructions included with each accessory. MOTORMASTER® I CONTROL INSTALLATION (50TJ016 and 020 Only) Install Field-Fabricated Wind Baffles — Wind baffles must be field-fabricated for all units to ensure proper cooling cycle operation at low ambient temperatures. See Fig. 25 for baffle details. Use 20-gage, galvanized sheet metal, or similar corrosion-resistant metal for baffles. Use field-supplied screws to attach baffles to unit. Screws should be 1/4-in. diameter and 5/8-in. long. Drill required screw holes for mounting baffles. To avoid damage to the refrigerant coils and electrical components, use recommended screw sizes only. Use care when drilling holes. Unoccupied Control (Part number on the control must be AD-DME1701-1 or AD-DME1711-1.) 20 mA LED 1k ohm Potentiometer 2to10VDC at 0 to 2000 ppm CO2 Sensors: Remote Minimum Position Remote LED Outdoor Air Enthalpy CROUTENT001A00 Return Air Enthalpy CRRETENT001A00 Line Voltage CO CO COM DAT COM REM POT COM LED COM 2 2 OAT COM OAH +15V RAT COM RAH +15V C O M PW O U TT T Violet C O M PW O U T T T Violet 470 ohm 5watt Resistor 24 VAC must be present on BI for the system to be unoccupied. Unoccupied Contact Tan Violet White Red Tan Violet White Red (+) 323ZCSENCO 24 VAC20 VA NOTUSED1 2- Field-supplied Wiring Wiring Included Fig. 24 — Typical EconoMi$er Sensor Wiring 15 Install Motormaster I Controls — Only one Motormaster I control is required per unit. The Motormaster I control must be used in conjunction with the Accessory 0° F Low Ambient Kit (purchased separately). The Motormaster I device controls outdoor fan no. 1 while outdoor fans no. 2 and 3 are sequenced off by the Accessory 0° F Low Ambient Kit. Accessory 0° F Low Ambient Kit — Install the Accessory 0° F Low Ambient Kit per instruction supplied with accessory. Sensor Assembly — Install the sensor assembly in the location shown in Fig. 26. Motor Mount — To ensure proper fan height, replace the existing motor mount with the new motor mount provided with accessory. Transformer (460 and 575-v Units Only) — On 460 and 575-volt units a transformer is required. The transformer is provided with the accessory and must be field-installed. Motormaster I Control — Recommended mounting location is on the inside of the panel to the l...