Lennox G61MPVT User Instructions

G A S F U R N A C E S

G61MPVT

Multi−Position − Two−Stage Heat

Variable−Speed − 50HZ

E N G I N E E R I N G D A T A Bulletin No. 490115

December 2006

MODEL NUMBER IDENTIFICATION

G 61 36−B− 070

MP

Unit Type

G = Gas Furnace

Series

61 = Two−Stage

Configuration

MP = Multi−Position

Blower

V = Variable Speed Blower

Voltage

T = 240V−1ph−50hz

Nominal Add−On Cooling Capacity

36 = 10.5 kW
60 = 17.6 kW

Australian Gas Association Rating − 5.3 Stars

Input − 69.6 to 139.3 Mj/h

Nominal Add−on Cooling − 10.5 to 17.6 kW

V T −1

Version

Gas Heat Input

070 = 69.6 Mj/h
090 = 92.8 Mj/h
110 = 116.1 Mj/h
135 = 139.3 Mj/h

1

Cabinet Width

B = 445 mm
C = 533 mm
D = 622 mm

1

Indoor coils with the same letter designation will physically match the furnace.

FEATURES

CONTENTS

Blower Data Pages 12−13. . . . . . . . . . . . . . . . . . . . . . . .

Dimensions Pages 8−11. . . . . . . . . . . . . . . . . . . . . . . . . .

Exhaust Pipe Venting Information Page 6. . . . . . . . . .

Features and Options Pages 2−4. . . . . . . . . . . . . . . . . . .

Filter Air Resistance Page 7. . . . . . . . . . . . . . . . . . . . . .

Installation Clearances Page 7. . . . . . . . . . . . . . . . . . . .

Model Number Identification Page 1. . . . . . . . . . . . . . .

Optional Accessories Selection Table Page 5. . . . . . .

Specifications Page 5. . . . . . . . . . . . . . . . . . . . . . . . . . . .

WARRANTY

Duralok Plus® Aluminized Steel Heat Exchanger − Ten
year limited warranty in residential applications, five

year limited warranty in non−residential applications.
All other covered components − Five years limited
warranty in residential applications, two year limited
warranty in non−residential applications.
Refer to Lennox Equipment Limited Warranty certificate
included with equipment for details.

APPROVALS

Australian Gas Association approval.
Blower data from unit tests conducted in Lennox
Laboratory air test chamber.

NERGY STAR

E
units are designed to use less energy, help save money
on utility bills, and help protect the environment
ISO 9001 Registered Manufacturing Quality System.

APPLICATIONS

Input capacities of 69.6, 92.8, 116.1 and 139.3 Mj/h
Australian Gas Association Rating − 5.3 Stars
Compact cabinet for up−flow, down−flow, horizontal−left
or horizontal−right applications without any internal
modifications to the unit.

G61MPVT−60D−135 can only be installed in
horizontal−right or down−flow applications.

Lennox add-on indoor coils, high−efficiency air cleaners
and humidifiers can easily be added to furnace.
Shipped factory assembled with all controls installed
and wired.
Each unit factory test operated to ensure proper
operation.

DIRECT VENT / NON−DIRECT VENT

Furnace can be installed in either Direct Vent or
Non−Direct applications. G61MPVT−60D−135 can only
be installed in direct vent applications.
In Direct Vent applications, combustion air is supplied
from outdoors and flue gases are discharged outdoors.
In Non−Direct Vent applications, combustion air is
supplied from indoors and flue gases are discharged
outdoors.

OPTIONS

Termination Kits

Facilitates installation of combustion air intake pipe and
flue exhaust pipe.
Refer to venting table in this bulletin to determine pipe
size needed and proper termination kit required.
See Specifications table and dimension drawings.

Termination Kit − Concentric − Direct Vent
Applications Only

50 or 80 mm (2 or 3 inch) kit contains concentric
termination assembly, reducer bushing and 45 degree
elbow.
50 mm (2 inch) kit for −070 models contains an exhaust
accelerator.
Kit requires single hole penetration of roof or wall for
installation.

®

(US Department of Energy) certified

B

D

E

M

G

F

N

C

J

H

K

I

HEATING SYSTEM

Lennox Duralok Plus

B

Lennox developed heat exchanger assembly consists
of primary heat exchanger and secondary condenser
coil assembly.
Main 3-pass clamshell type heat exchanger constructed
of heavy−gauge, aluminized steel.
Designed for normal expansion and contraction.
Crimped seam design and construction provides
maximum efficiency and minimum resistance to airflow.
Secondary heat exchanger condenser coil constructed

C

of aluminum fins fitted to stainless steel tubes.
Coil is factory tested for leaks.
Condensate drain header box assembly located on
front of coil.
Compact size of complete heat exchanger assembly
permits low overall design of furnace cabinet.
All components mounted in a heavy−gauge steel frame.
Heat exchanger assembly has been laboratory life cycle
tested.

Lennox Designed Header Box

Header box on end of condenser coil collects flue
condensate for disposal through condensate collars.
Hose connects the header box drains to the condensate
collars.
The condensate collars are located on each side of the
cabinet for easy field installation of condensate drain
trap. Only one collar is used, the remainder stay
plugged.
Condensate drain trap is included with the unit for field
installation.

®

Heat Exchanger Assembly

L

G61MPVT − 50hz / Page 2

FEATURES

HEATING SYSTEM − continued

Lennox Designed Flue Condensate Trap Assembly

Condensate trap assembly is mounted outside the
conditioned air stream.
Assembly can be mounted on either side of cabinet in
up−flow and down−flow applications. Assembly is mounted
on the bottom of the cabinet in horizontal applications. See
Installation Instructions.
Connection can be made with field provided 1/2 in. PVC
pipe, 3/4 in. PVC coupling, or 1−1/4 in. OD x 1 in. ID tubing
with hose clamp.
Easy to clean and winterize.

Inshot Burners

D

Aluminized steel inshot burners provide efficient,
trouble−free operation.
Burner venturi mixes air and gas in correct proportion for
proper combustion.
Burner assembly is removable from the unit as a single
component for ease of service.

Two−Stage Gas Control Valve

E

24 volt redundant combination two stage gas control
valve combines manual shut off valve (On−Off),
automatic electric valve (dual) and gas pressure
regulation into a compact combination control.

Flame Rollout Switch

Manual reset switches are factory installed on burner
box.
Switch provides protection from abnormal operating
conditions.

Hot Surface Mini−Nitride Ignitor

Unique, non−porous, high strength proprietary ceramic
material provides long life and trouble−free
maintenance.
Low mass element provides fast heat−up and consistent
igniter temperature with low power usage.
Cemented to alumina block for positive mounting and
protection against current leakage.
High temperature Teflon
for dependable operation.

Combustion Air Inducer

F

PSC, heavy−duty blower prepurges heat exchanger and
safely vents flue products.
Pressure switches prove blower operation before

G

allowing gas valve to open.
Operates only during heating cycle.

Limit Control

Automatic reset, primary and secondary limits are
accurately located.
Primary limit factory installed on vestibule panel on all
units, secondary limit factory installed on blower
housing.

OPTIONS

High Altitude Pressure Switch Kit

Required on certain units for proper unit operation on
installations above 610 m.
Units not approved for installations above 1372 m.
Order two per unit.

LPG/Propane Conversion Kit

Required for field changeover from natural gas to
LPG/Propane.

Natural Gas Conversion Kit

Required for field changeover from LPG/Propane to
natural gas.

®

insulated ignition lead wires

CONTROLS

Integrated Two Stage / Variable Speed Blower

H

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.
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.
Watchguard type circuit automatically resets ignition
controls after one hour of continuous thermostat
demand after unit lockout, eliminating nuisance calls for
service.
To aid in troubleshooting, the last three fault codes are
stored for a maximum of six months. Displays the fault
codes through indicator LED’s.
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 accessory terminals furnished for additional power

I

supply requirements for 240 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).

Power Lead

2.5 m power lead is provided for connection to an IEC
receptacle located on the right side of the furnace.

IEC Receptacle

IEC receptacle provided on right side of furnace cabinet
for easy, plug−in electrical connection.

24 Volt Transformer

Furnished and factory installed on blower wrapper.
40VA transformer has circuit breaker wired in series.

( minus) motor speed

G61MPVT − 50hz / Page 3

FEATURES

CONTROLS − CONTINUED

OPTIONS

SignatureStatt Home Comfort Control

Combination temperature
and humidity.
2 Heat/2
Cool
Auto−changeover
Controls humidity during
cooling operation.
Easy−to−use, menu
driven thermostat with a back−lit, dot−matrix LCD
screen.
Remote outdoor sensor (furnished) allows the
thermostat to display outdoor temperature and adjust
indoor dewpoint temperature for precision humidity
control in cooling mode.
See the SignatureStat Engineering Handbook bulletin in
the Controls section for more information.

BLOWER

Variable Speed Direct Drive Blower

J

Each blower assembly statically and dynamically
balanced.
Change in blower speed is easily accomplished by
simple DIP switch change on Integrated Furnace Two
Stage / Variable Speed Blower Control.
See Blower Performance tables.
Blower assembly easily removed for servicing

Variable Speed Blower Motor

K

Variable speed motor maintains specified air volume
from 0 though 200 Pa static range.
Motor is controlled by Integrated Furnace Two Stage /
Variable Speed Blower Control.
Motor is resiliently mounted.

FILTER (NOT FURNISHED)

Filter and provisions for external mounting must be field
provided.

CABINET

Low−profile, narrow width cabinet allows easy
installation in up−flow, down−flow or horizontal
applications.
Heavy−gauge, cold rolled steel construction.
Pre−painted cabinet finish.
Flanges provided on supply air opening for ease of
plenum connection or alignment with indoor coil.
Fully insulated cabinet with foil faced insulation on sides

L

and back of heating compartment and mat faced
insulation in blower compartment.
Tool−less latches on blower and burner doors assure

M

positive lock.
Complete service access.
Safety interlock switch automatically shuts off power to
unit when blower compartment access door is removed.
Gas piping inlets are provided in both sides of cabinet.

N

Return Air Entry:

For bottom/end return−air entry for up−flow/horizontal
applications, remove furnished bottom seal panel from
cabinet.
For side return−air entry (up−flow applications only),
corners are marked on either side of cabinet for return
air cut−outs.
On furnaces with side return air and condensate trap on
the same side of the cabinet, a field fabricated transition
is required when using an IAQ (indoor air quality)
product higher than 360 mm installed next to the unit
and serviced from the front. IAQ products higher than
508 mm require a field fabricated transition. See
dimension drawings.

NOTE − 60C and 60D size units that require air
volumes over 850 L/s must have one of the
following:

1. Single side return air with transition, to accommodate
508 x 635 x 25 mm cleanable air filter, required to
maintain proper air velocity.

2. Bottom return air.

3. Return air from both sides.

4. Bottom and

See Blower Performance Tables for additional
information.

Coil Match−up

All furnaces exactly match C33 and CX34 cased up−flow
indoor coils and CH33 horizontal indoor coils with same
letter designation in model number. No adaptor
required. Engaging holes furnished on cabinet for
alignment.
C33 uncased coils match furnaces without any
overhang but require an optional adaptor base or field
fabricated transition to match furnace opening. See C33
coil bulletin for additional information.
All furnaces exactly match CR33 cased, down−flow
indoor coils with adaptor rails, furnished with coil.

OPTIONS

Condensate Trap Alternate Location Kit

Allows condensate drain to be installed on the opposite
side of the furnace from the exhaust venting (up−flow
applications only).

Down−Flow Combustible Floor Base

Required for heating only units installed on combustible
floors.
Not required in add-on cooling applications.
See Dimension Drawing.

one side return air.

G61MPVT − 50hz / Page 4

SPECIFICATIONS

Performance

Input

Gas
Heating

Connections
in.

with field supplied (PVC cplg.) − o.d. 3/4 3/4 3/4 3/4

Indoor
Blower

ShippingData kg − 1 package 68 82 85 94

Electricalcharacteristics 240 volts − 50 hertz − 1 phase (less than 10 amps)

NOTE − Filters and provisions for mounting are not furnished and must be field provided.

High

Fire

Temperature rise range − C 25 − 41 22 − 39 28 − 44 36 − 53

Gas Manifold Pressure

(Natural Gas) − Pa

Low

Fire

Temperature rise range − C 14 − 31 11 − 28 17 − 33 22 − 39

Gas Manifold Pressure

(Natural Gas) − kPa

Australian Gas Association

Energy Rating − Stars

Intake / Exhaust Pipe (PVC) 2 / 2 2 / 2 2 / 2 3 / 3

Condensate Drain Trap

hose with hose clamp − i.d. x o.d. 1−1/4 x 1 1−1/4 x 1 1−1/4 x 1 1−1/4 x 1

GaspipesizeIPS 1/2 1/2 1/2 1/2

Wheel nom. dia. x width −mm 203 x 508 292 x 508 292 x 508 292 x 508

kW ofadd−oncooling 7.0 − 12.2 12.2 − 17.6 12.2 − 17.6 12.2 − 17.6

Air Volume Range − L/s 295 − 660 410 − 1020 350 − 1045 430 − 1035

ModelNo. G61MPVT−36B−070 G61MPVT−60C−090 G61MPVT−60C−110 G61MPVT−60D−135

Input− Mj/h 69.6 92.8 116.1 139.3

Output− kW 17.9 23.7 29.0 35.7

0.87 0.87 0.87 0.87

Input− Mj/h 47.5 63.3 79.1 95.0

Output− kW 12.6 16.7 21.1 25.5

0.42 0.42 0.42 0.42

5.3 5.3 5.3 5.3

Highstatic− Pa 200 200 200 200

1/2 1/2 1/2 1/2

(PVC pipe) − i.d.

Motoroutput − W 373 745 745 745

OPTIONAL ACCESSORIES − MUST BE ORDERED EXTRA

B" Width Models C" Width Models D" Width Models

CABINET ACCESSORIES

Down−Flow Combustible Floor Base 11M60 11M61 11M62

CONDENSATE DRAIN KITS

Condensate Trap Alternate Location Kit − Up−Flow Only 76M20 76M20 − − −

CONTROLS
TERMINATION KITS − See Installation Instructions for specific venting information.

Concentric Termination Kits − Direct Vent
Applications Only

GAS HEAT ACCESSORIES

High Altitude Pressure Switch Kit

Input

−070 56M23 59M13 59M13 59M87 59M87

−090 56M23 59M13 59M13 59M87 59M87

−110 75M22 59M13 59M13 59M87 59M87

−135 Not allowed 59M13 Not allowed 59M87 Not allowed

ORDER TWO EACH

611 − 1372 m 0 − 610 m 611 − 1372 m 0 − 610 m 611−1372 m

50 mm (2 in.) 71M80 69M29 − − −

80 mm (3 in.) − − − 60L46 60L46

LPG/Propane Kit LPG/Propane to

Natural Gas Kit

G61MPVT − 50hz / Page 5