Table of Contents
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THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer or
equivalent, service agency, or the gas supplier.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
Shipping and Packing List
Package 1 of 1 contains:
1 – Assembled electric heat section
1 – Bag assembly containing the following:
6 – Screws
1 – Wiring diagram
Circuit breaker cover - 1 each
1 – Transformer (575V, 3-phase, 60Hz only)
1 – Fuse block extension plate (460V, 3-phase, 60Hz and
575V, 3-phase, 60Hz only)
2 – Adhesive-backed foam seals
1 – Circuit breaker cover
Check equipment for shipping damage; if found, immedi-
ately contact the last carrier.
INSTALLATION
INSTRUCTIONS
ECB27 Series Units
ELECTRIC HEAT SECTIONS
507855-01
7/2019
Electric shock hazard! - Disconnect all power
supplies before servicing.
Replace all parts and panels before
operating.
Failure to do so can result in death or
electrical shock.
Electric Heat Section
The ECB27 series electric heat section provides field-in-
stalled electric heat for various air handler units. These
electric heat sections are available in either single- or
three-phase. Single-phase heat sections are equipped
with either terminal blocks or circuit breakers.
Refer to the model-specific air handler product specifica-
tion bulletin for heat section applications.
General Information
These instructions are a general guide and do not su-
persede local codes. Local authorities having jurisdiction
should be consulted before installation. Read these in-
structions thoroughly before starting installation.
Be sure to disconnect all power to the unit before you in-
stall and service this equipment. Use proper tools and pro-
tective equipment during installation and service.
Installation of air handler with or without optional electric
heat must conform with standards in the National Fire
Protection Association (NFPA) Standard for Installation of
Air Conditioning and Ventilation Systems NFPA No. 90A,
and Standard for Installation of Resident Type Warm Air
Heating and Air Conditioning System, No. 90B, the man-
ufacturer's installation instructions, and local municipal
building codes.
Page 1
WARNING
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Table of Contents
Related Manuals for Lennox ECB27 Series
Summary of Contents for Lennox ECB27 Series
- Page 1 WARNING Electric Heat Section Improper installation, adjustment, alteration, service The ECB27 series electric heat section provides field-in- or maintenance can cause property damage, personal stalled electric heat for various air handler units. These injury or loss of life. Installation and service must be...
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Page 2: Heat Section Installation
1 - Shut off all power to the air handler. More than one Heat Section Installation disconnect may be required. Before installing the electric heat section, check the unit 2 - Remove air handler access panel. rating plate to ensure that the unit meets the job require- 3 - Remove the electric heat knockout from the air ments, that proper electrical power is available, and that handler vestibule panel to accommodate the heater... - Page 3 C - Rotate the circuit breaker 180 degrees. IN DOWNFLOW APPLICATIONS, CIRCUIT BREAKERS MUST BE ROTATED 180º TO THE UP POSITION. D - Slide the circuit breaker back on the rail and secure in place with previously removed screw. 2 - The air handler access panels are factory supplied. There is a patch plate over the circuit breaker opening.
- Page 4 ECB27 12.5CB ECB27-4CB, ECB27 5CB, ECB27-6CB, PATCH PLATE ECB27 15CB ECB27 8CB, ECB27-9CB (SHIPPED INSTALLED ON AIR HANDLER) SIDE OF UNIT SIDE OF UNIT LONG SECTION PATCH PLATE SHOWN WITH LONGEST SECTION ON THE RIGHT SIDE. PATCH PLATE MAY BE FACTORY INSTALLED WITH LONG SECTION ON THE LEFT SIDE.
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Page 5: Electrical Connections
IMPORTANT Circuit Breaker Cover Installation If the air handler is installed in an unconditioned space the Confirm airtight seal between breaker cover and air provided circuit breaker cover must be installed. handler access panel. Apply a thin silicone bead to the adhesive back seat to ensure airtight seal. -
Page 6: Unit Start-Up
4 - Make wiring connections as follows: • Heaters equipped with fuses (460V, 3-Phase, 60Hz and 575V, 3-Phase, 60Hz) – Connect field • Heaters equipped with circuit breakers – Connect power supply wiring to fuse block. (An extension field power supply wiring to circuit breaker(s). plate is provided for J-voltage units.) •... - Page 7 CIRCUIT 1 CIRCUIT BREAKERS OR TERMINAL BLOCK CIRCUIT BREAKER O Y1 R THERMOSTAT HEAT ANTICIPATION SETTING 0.4 AMP ELECTRIC HEAT FACTORY INSTALLED JUMPERS MOVE JUMPER BETWEEN TERMINALS “R' AND “W2.” EMERGENCY HEAT RELAY (USED ONLY IF OUTDOOR T'STAT IS USED) FIELD PROVIDED AND INSTALLED NEAR INDOOR UNIT.
- Page 8 Unit Field Wiring Diagrams FIGURE 13. Typical Unit Diagram – Air Handlers with Constant Torque Motors (P Voltage – 208-230V, 1-Phase, 60Hz) Page 8...
- Page 9 FIGURE 14. Typical Unit Diagram – Air Handlers with PSC, Non-Communicating Motors (P Voltage – 208-230V, 1-Phase, 60Hz) Page 9...
- Page 10 FIGURE 15. Typical Unit Diagram – Air Handlers with Variable Speed, Communicating Motors (P Voltage – 208-230V, 1-Phase, 60Hz) Page 10...
- Page 11 FIGURE 16. Typical Unit Diagram – Air Handlers with Constant Torque Motors (G Voltage — 460V, 3-phase, 60Hz) Page 11...
- Page 12 Electric Heat Wiring Diagram Cross Reference The following table provides a cross-reference for diagrams for specific electric heat models. TABLE 1 Electric Heat Section Model Wiring Diagram # ECB27-4(CB)-P 538002-01 ECB27-5(CB)-P 538002-01 ECB27-6(CB)-P 538002-01 ECB27-8(CB)-P 538003-01 ECB27-9CB-P 538004-01 ECB27-12.5CB-P 538005-01 ECB27-15CB-P 538005-01 ECB27-20CB-P...