Lennox International Inc Merit Series Air Conditioner 24VAC Transformer, Install Thermostat

Page 11

STEP 4 -- ELECTRICAL -- Circuit Sizing and Wire Routing

In the U.S.A., wiring must conform with current local codes and the current National Electric Code (NEC). In Canada, wiring must conform with current local codes and the current Canadian Electrical Code (CEC).

Refer to the furnace or air handler installation instructions for additional wiring application diagrams and refer to unit nameplate for minimum circuit ampacity and maximum overcurrent protection size.

24VAC TRANSFORMER

IMPORTANT !

If unit is equipped with a crankcase heater, it should be energized 24 hours before unit start-up to prevent compressor damage as a result of slugging.

CAUTION

Use the transformer provided with the furnace or air handler for low‐voltage control power (24VAC - 40 VA minimum)

WARNING

Electric Shock Hazard. Can cause injury or death. Unit must be grounded in accordance with national and local codes. Line voltage is present at all components when unit is not in operation on units with single‐pole contactors. Disconnect all remote electric power supplies before opening access panel. Unit may have multiple power supplies.

ELECTROSTATIC

DISCHARGE

(ESD)

Precautions and

Procedures

Electrostatic discharge can affect electronic components. Take care during unit installation and service to protect the unit's electronic controls. Precautions will help to avoid control exposure to electrostatic discharge by putting the unit, the control and the technician at the same electrostatic potential. Touch hand and all tools on an unpainted unit surface before performing any service procedure to neutralize electrostatic charge.

SIZE CIRCUIT AND INSTALL SERVICE

DISCONNECT SWITCH

Refer to the unit nameplate for minimum circuit ampacity, and maximum fuse or circuit breaker (HACR per NEC). Install power wiring and properly sized disconnect switch.

MAIN FUSE BOX/

BREAKER PANEL

SERVICE

DISCONNECT

SWITCH

INSTALL THERMOSTAT

Install room thermostat (ordered separately) on an inside wall approximately in the center of the conditioned area and 5 feet (1.5m) from the floor. It should not be installed on an outside wall or where it can be affected by sunlight or drafts.

THERMOSTAT

5FEET (1.5M)

NOTE —Units are approved for use only with copper conductors. Ground unit at disconnect switch or connect to an earth ground.

NOTE — 24VAC, Class II circuit connections are made in the control panel.

FIGURE 13

Page 11

13ACX SERIES

Page 10 Page 12
Image 11
Page 10 Page 12
Contents Minimum Clearance Between TWO Units Setting the Unit -- ClearancesGeneral Placement Setting the Unit CONTIN­ UED -- Unit PlacementUnit Dimensions Inches MM Unit DimensionsVertical Runs NEW Construction Shown InstallationRefrigerant Line SET Installing Refrigerant Line SET Installing Horizontal RunsRefrigerant Line SET Inches MM Liquid Line Filter Drier InstallationTypical Liquid Line Filter Drier Installation 2CONNECT Gauges and Equipment for Flushing Procedure 1CUT and Debur Refrigerant Piping -- Brazing Procedures7PREPARATION for Next Step Wrap Service ValvesFlow Nitrogen 6BRAZE Line SETEqualizer Line Installation Refrigerant Piping -- Installing Indoor Expansion ValveIndoor Expansion Valve Installation Sensing Bulb InstallationLeak Test Leak Test and EvacuationOpen both manifold valves and start the vacuum pump Evacuation24VAC Transformer Electrical -- Circuit Sizing and Wire RoutingSize Circuit and Install Service Disconnect Switch Install ThermostatOperating Manifold Gauge SET and Service Valves Electrical -- High Voltage and Field Control WiringRouting High VOLTAGE, Ground and Control Wiring High Voltage / Ground Wires Field Control WiringTorque Requirements Homeowners Information Checking and Adding System RefrigerantStart UP Checks 13ACX Start-Up and Performance ChecklistCooling Mode
Top Page Image Contents