Lennox G61MPV Engineering Data page 4

FEATURES
BLOWER
Variable Speed Direct Drive Blower
Each blower assembly statically and dynamically
balanced.
Change in blower speed is easily accomplished by simple
DIP switch change on SureLight
Two Stage / Variable Speed Blower Control.
See Blower Performance tables.
I
Blower assembly easily removed for servicing
J
Variable Speed Blower Motor
Variable speed motor maintains specified air volume from
0 though 0.80 in. w.g. static range.
Variable speed operation is achieved by the use of an
ECM (Electronically Commutated Motor) motor.
Motor is controlled by SureLight
Stage / Variable Speed Blower Control.
Motor is resiliently mounted. When furnaces are used with
Harmony Zone IIIt Control System, blower motor
operates from predetermined minimum − maximum air
volumes to satisfy zone requirements.
FILTER (NOT FURNISHED)
Filter and provisions for external mounting must be field
provided.
OPTIONS
Air Filter and Rack Kit for Horizontal Return Air
(End) Applications
Washable or vacuum cleanable polyurethane frame type
filter and external end return air rack available for field
installation.
Rack has filter door for easy filter servicing.
Flanges on rack allow easy duct connection.
See dimension drawing.
Air Filter and Rack Kit for Side Return Air
Applications (Not for use with RAB Return Air Base)
Washable or vacuum cleanable polyurethane frame type
filter and external side return air rack available for field
installation.
Available in single and ten pack kits.
Rack has filter door for easy filter servicing.
Flanges on rack allow easy duct connection.
Field installs on either side of unit cabinet.
See dimension drawing.
EZ Filter Base for Bottom Return Air Applications
Hinged door with thumbscrew for easy filter access.
Uses standard size filters (field provided).
CONTROLS
K
®
SureLight Integrated Two Stage / Variable Speed
Blower Control
Solid−state board contains all necessary controls and
relays to operate furnace.
Combustion air inducer is controlled by board. Prior to
ignition, a pre−purge cycle for 15 seconds is initiated. After
the main burners are turned off, a post−purge cycle for 5
seconds is run.
Adaptive technology of ignition control board continuously
monitors and adjusts the ignitor power to operate at
minimum ignitor temperature required for ignition,
prolonging ignitor life.
Electronic flame sensor assures safe, reliable operation.
Should flame fail to ignite, flame sensor will initiate 4
re−attempts at ignition before locking out unit operation for
60 minutes.
G61MPV / Page 4
®
Integrated Furnace
®
Integrated Furnace Two
Watchguard type circuit automatically resets ignition
controls after one hour of continuous thermostat demand
after unit lockout, eliminating nuisance calls for service.
Jumper settings for 1 or 2 stage thermostat operation.
Two selectable 2nd stage recognition times (10 and 15
minutes) are available on the board when the furnace is
used with a single stage thermostat. When used with a two
stage thermostat, furnace will only initiate second stage
operation with a second stage thermostat demand.
Two LED's indicate heating status and aid in
troubleshooting.
L
Two accessory terminals furnished for additional power
supply requirements for 120 volt (less than 1 amp) power
humidifiers and powered air cleaners.
Two blower speeds − second stage heat and second stage
cool (with four air volume selections for each) are selected
by DIP switches on board. Heat speed can be adjusted to
optimize discharge temperature. Cool speed can be
adjusted to correct optional cooling capacity. See Blower
Performance tables.
First stage blower speed is a percentage of 2nd stage speed.
The ADJUST switch (DIP) allows normal (NORM), 10%
higher (+ plus) or 10% lower
selection within HEAT and COOL speeds selected for fine
tuning air volume.
DELAY switch (DIP) allows one of four de−humidification
profiles during cooling mode.
Profile A − Motor runs at 50% for 30 seconds, then at
82% for 7−1/2 minutes, then at 100% (if needed) until
demand is satisfied. Once demand is met, motor runs at
50% for 30 seconds, then ramps down to stop.
Profile B − Motor runs at 82% for 7−1/2 minutes and then
at 100% (if needed) until demand is satisfied. Once
demand is met,motor ramps down to stop.
Profile C − Motor runs at 100% until demand is satisfied.
Once demand is met, motor runs at 100% for 60
seconds, then ramps down to stop.
Profile D − Motor runs at 100% until demand is satisfied.
Once demand is met, motor ramps down to stop.
In heat mode, blower on time is fixed at 45 seconds,
blower off time is adjustable from 60, 90, 120 and 180
seconds (factory setting − 90 seconds).
Control has four status lights (CFM, ON/OFF, HTG
BLOWER, HI/LOW) to assist in servicing.
For air−conditioning applications, blower on time is 2
seconds following thermostat demand for cooling.
Board controls evaporator humidity by controlling blower
and compressor speed on two stage outdoor units when
used with Lennox SignatureStat.
Control is factory installed in the unit control box.
M
24 Volt Transformer
Furnished and factory installed in control box.
40VA transformer has circuit breaker wired in series.
N
Field Wiring Make-up Box
Furnished for line voltage wiring.
Factory installed internally on left side of furnace.
Box may be installed internally or externally on either side
of furnace.
minus) motor speed
(