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INSTALLATION AND MAINTENANCE
Improper installation, adjustment, service, or maintenance can cause injury or prop-
erty damage. Refer to this manual. For assistance or additional information, consult
a qualified installer or service agency.
WARNING
The information contained in this manual is
intended for use by qualified service techni-
cians familiar with safety procedures and
equipped with the proper tools and test in-
struments. Failure to carefully read and follow
all instructions in this manual can result in
equipment malfunction, property damage,
personal injury, and/or death.
WARNING
Disconnect all power supplies to both the
indoor blower section and outdoor section
before making any electrical connections or
servicing the system. More than one discon-
nect switch may be required to de-energize
the equipment. Hazardous voltage can
cause severe personal injury or death.
Manufactured By
A Lennox International Inc. Company
421 Monroe Street
Bellevue, OH 44811
*44876D006*
# 44876D006
0650329-50 / 44876D006
INSTRUCTIONS
EF Electric Furnace
A.A.C.
Save these instructions for future reference
WARNING
Inspection of Shipment
Upon receipt of equipment, carefully inspect it for possible
shipping damage. If damage is found, it should be noted
on the carrier's freight bill. Take special care to examine
the unit inside the carton if the carton is damaged. Any
concealed damage discovered should be reported to the
last carrier immediately, preferably in writing, and should
include a request for inspection by the carrier's agent.
If any damages are discovered and reported to the carrier
DO NOT INSTALL THE UNIT, as claim may be denied.
Check the unit rating plate to confirm specifications
are as ordered.
TABLE OF CONTENTS
INSTALLATION....................................... 2
SETUP PROCEDURE ........................... 6
SEQUENCE OF OPERATION ............... 8
SYSTEM CHECK ................................... 9
REPLACEMENT PARTS ...................... 10
MAINTENANCE ................................... 10
AIRFLOW CONFIGURATIONS ............ 11
Page 1
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Table of Contents
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Summary of Contents for Armstrong EFV
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Page 1: Table Of Contents
INSTALLATION AND MAINTENANCE INSTRUCTIONS EF Electric Furnace WARNING Improper installation, adjustment, service, or maintenance can cause injury or prop- erty damage. Refer to this manual. For assistance or additional information, consult a qualified installer or service agency. Inspection of Shipment WARNING Upon receipt of equipment, carefully inspect it for possible The information contained in this manual is... -
Page 2: Installation
INSTALLATION Knockouts are provided for electrical power wiring entrance. When used on cooling applications, excessive sweating This EF electric furnace is designed for ease of installation may occur when unit is installed in a very humid space. featuring horizontal, upflow, and downflow (counterflow) applications. - Page 3 If an elbow is included in the plenum close to the unit, Supply and return ductwork must be adequately sized to it must not be smaller than the dimensions of the meet the system’s air requirements and static pressure supply duct flange on the unit. capabilities.
- Page 4 Condensate Drain Connection • Install a 2" trap in the primary drain line as close to the unit as practical. Make sure that the top of the trap is Do not operate unit without a drain trap. The conden- below connection to the drain pan to allow complete sate drain is on the negative pressure side of the drainage of pan.
- Page 5 Electrical Wiring Variable Speed Features The EFV electric furnace is equipped with a variable WARNING speed motor and will deliver a constant airflow within a wide range of external static pressures. The variable Turn off electric power at the fuse box or...
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Page 6: Setup Procedure
SETUP PROCEDURE Blower Performance Chart PSC Motor PSC Motor For proper cooling operation, the airflow through the indoor coil should be between 350 and 450 CFM per ton (12,000 Btuh) of cooling capacity based on the rating of the outdoor unit. The cooling blower speed is factory configured to provide correct airflow for an outdoor unit that matches the maximum cooling capacity rating of the electric furnace. - Page 7 The versatility of the variable speed motor enables the compressor stage 1 (Y1), compressor stage 2 (Y2), and performance of the EFV electric furnace to be tailored to blower (G) are all indicated by lit LED’s on this board. If a...
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Page 8: Sequence Of Operation
SEQUENCE OF OPERATION transfer to the first stage heat on the thermostat. This will allow the indoor blower to cycle on and off with the electric heat when the fan switch is in the AUTO position. Cooling (cooling only or heat pump) Single Stage Cooling For single stage cooling, Y1 and Y2 need to be jumpered. -
Page 9: System Check
SYSTEM CHECK Electric Heater To check the electric heater operation: Pre-start Check 1. Set thermostat to call for auxiliary heat (approximately • Is unit properly located, level, secure, and service- 5° F above ambient temperature). The indoor blower able? and auxiliary heat should come on together. Allow a minimum of 3 minutes for all sequencers to cycle on. -
Page 10: Replacement Parts
REPLACEMENT PARTS MAINTENANCE Use only original equipment service parts when repairing Air Filters these products. These parts include but are not limited to: Important: Do not operate system without a filter. A circuit breakers, heater controls, heater limit controls, filter is required to protect the coil, blower, and heater elements, motor, blower relay, control transformer, internal parts from excessive dirt and dust. -
Page 11: Airflow Configurations
AIRFLOW CONFIGURATIONS Counterflow Upflow Left to Right Airflow Right to Left Airflow Horizontal # 44876D006 Page 11... -
Page 12: Wiring Diagram
PART NO. 065866900 WIRING DIAGRAM - ELECTRIC HEAT HEATERS USED SEQ2 2nd STAGE 18 BLK 5 KW = HE1 7.5 & 10 KW = HE1 & HE2 12 BLK 12 BLK 15 KW = HE1, HE2, & HE3 12 BLK 20 KW = HE1, HE2, HE3, &... - Page 13 Wiring Diagram Variable Speed Blower Figure 4 # 44876D006 Page 13...
- Page 14 Low Voltage Connections (PSC Motor) Figure 5 Page 14 # 44876D006...
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Page 15: Limited Warranty
NOTE: After the first year, in the event that a gas or oil heat exchanger is no longer being manufactured by the warrantor, the warrantor will allow a credit equal to the then current wholesale price of an equivalent heat exchanger towards the purchase of a new Armstrong gas or oil furnace.