Granby Conforto KLE 10 TO 27kW Setup guide

Revised on 2020-12-09 G2018 Rev. C (V6.0+)
Installation, Operation and Service
Manual
Conforto Electric
Furnace
KLE 10 TO 27kW
INSTALLATIONS MUST MEET ALL LOCAL AND FEDERAL CODES THAT MAY
DIFFER FROM THIS MANUAL
Please read the manual in its entirety before beginning installation. This
manual must be kept with the furnace for future reference. For
maintenance or question, please refer to your installer – contractor directly.

TABLE OF CONTENTS
1.0 IMPORTANT SAFETY ADVICE ......................................................................................................................................................... 3
2.0 PRODUCT INFORMATION .............................................................................................................................................................. 4
INSTALLATION OVERVIEW ........................................................................................................................................................................... 4
INSPECTION ................................................................................................................................................................................................. 4
3.0 INSTALLATION ............................................................................................................................................................................... 4
SELECTING A LOCATION ..................................................................................................................................................................................... 5
CLEARANCES TO COMBUSTIBLE MATERIALS ............................................................................................................................................................ 6
4.0 ELECTRICAL CONNECTIONS ........................................................................................................................................................... 6
IG VOLTAGE CONNECTIONS ............................................................................................................................................................................. 6
FAN MOTOR CONNECTIONS. ............................................................................................................................................................................... 6
LOW VOLTAGE CONNECTIONS .............................................................................................................................................................................. 7
5.0 PANEL DISPLAY, SWITCHES AND CIRCUIT BREAKER .......................................................................................................................
LED INDICATIONS ............................................................................................................................................................................................ 7
OPERATION OPTIONS DIP SWITC ES 1, 2, 3 AND 4................................................................................................................................................. 8
OPERATION OPTIONS DIP SWITC ES A, B, C.......................................................................................................................................................... 8
OPERATION OPTION DIP SWITC D - QUIET COMFORT FEATURE ............................................................................................................................... 8
DEICING MODE (WIT EAT PUMP ONLY) .............................................................................................................................................................. 8
CIRCUIT BREAKERS ............................................................................................................................................................................................ 8
COMFORTMAX MODE ..................................................................................................................................................................................... 9
6.0 TECHNICAL INFORMATION ........................................................................................................................................................... 10
KLE SERIES WIT 230V PSC MOTOR ........................................................................................................................................................... 10
KLE SERIES WIT ECM ECOTEC MOTOR .................................................................................................................................................. 11
.0 HEATING OUTPUT RATES BY STAGES ............................................................................................................................................ 12
8.0 COMMISIONING CHECKLIST ......................................................................................................................................................... 12
9.0 KLE SERIES ELECTRIC FURNACE WIRING DIAGRAMS ..................................................................................................................... 13
10.0 EXPLODED VIEW KLE ............................................................................................................................................................... 15

3
1.0 IMPORTANT SAFETY ADVICE
Please read and understand this manual before installing, operating or servicing the
furnace. To ensure you have a clear understanding of the operation of the unit please take the
time to read the IMPORTANT SAFETY ADVICE section of this manual.
WARNING – BASIC SAFETY WARNINGS
KNOW the location of the emergency disconnect switch for the unit.
EXAMINE the package before installation to ensure it did not get damaged during shipping.
ENSURE that the unit is connected to a properly sized duct system before controller is powered.
Failure to do so will result in damage to the heating elements, voiding the warranty.
WARNING – BEST PRACTICES FOR OPTIMAL OPERATION
DO NOT ATEMPT DO INSTALL YOURSELF OR MAKE ANY REPAIRS IF YOU ARE NOT A
QUALIFIED TECHNICIAN, CALL A QUALIFIED HEATING TECHNICIAN.
DANGER
Do not use this furnace as a construction heater. Use of this furnace as a construction
heater exposes it to abnormal conditions, contaminated circulating air and air filtering.
Failure to follow this warning can lead to premature furnace failure which could result in a
fire hazard and/or bodily harm and/or material damage and will void its manufacturer’s
warranty.
IMPORTANT
This manual is intended to inform the installer of installation, operation and maintenance
procedures for trouble free operation of the Conforto KLE electric furnace. It is essential that the
service technician carefully reads this manual to fully understand the furnace and its installation,
operation and maintenance procedures before servicing the furnace or the heating system as
operating procedures may vary depending on furnaces manufacturers. The Conforto KLE electric
furnace is designed and manufactured with quality components for maximum life expectancy,
durability and requires minimum maintenance and service. To insure a satisfactory installation, it
is imperative that the instructions in this manual be followed carefully before operating the heating
system. Failure to do so may result in breach of warranty.

4
2.0 PRODUCT INFORMATION
The Conforto KLE warm air electric furnace shall be installed in the up flow position only. This
appliance may be used with a central heat-pump or central cooling system.
INSTALLATION OVERVIEW
Install this appliance in accordance with these instructions and all national and local building/safety
codes and requirements.
Only connect this furnace to a duct system with a maximum static pressure of 0.50” W.C. Static
pressures in excess will result in reduced air fl ow and potential elevated discharge air
temperatures during heating cycles and reduced discharge air temperatures during cooling
cycles.
Do not operate this furnace without both supply and return air ducts installed with air fi lters in place
or with less than 0.20” W.C, external static pressure.
INSPECTION
As soon as you receive this unit un package and inspect it thoroughly to ensure that no damage
has resulted during the shipping process.
3.0 INSTALLATION
General
These furnaces must be properly installed in compliance with all national and local safety standard
codes. This appliance requires 240Vac single phase, 60Hz voltage. The supply power lead shall
enter the control enclosure of the furnace through the knockout provided on the right-hand side of
the furnace. This will ensure the required separation between the low voltage and high voltage
leads.
Knockouts are provided for 120Vac and 24Vac connections for humidifiers and electronic air
cleaners on both sides of the furnace.
Always ensure that the installation protects all electrical components from exposure to water.
Attention must be given to the placement of A/C coils and drains.
ATTENTION: the front of the appliance must always remain accessible to allow maintenance and
service.
Due to the hazardous nature of electrical and mechanical requirements only trained and
qualified personnel should install and service heating and cooling equipment.

5
WARNING
It is important to check airflow and make sure that the furnace does not operate above the
temperature rise specified in the specifications, Section 6. This is particularly important if
a cooling or heat pump coil has been installed. High limit thermal protectors should never
engage during normal operation of the furnace. The high limit protectors are designed to
engage during the improper functioning of the blower or when the air fi lter has not been
kept clean.
SELECTING A LOCATION
This furnace shall be centrally located in relation to the outlet registers. All ductwork shall be
suitably sized with external static pressure in mind to ensure adequate air distribution.
Figure 1
Up flow Installation

6
CLEARANCES TO COMBUSTIBLE MATERIALS
The Furnace - The furnace is approved for zero clearance to combustible materials regardless
of the heating capacity. It is recommended that 24” (60cm) be provided at the front of the furnace
for clear access for servicing.
Supply Air Ducts - Supply ducts for furnaces with a heating capacity up to and including
20kW may be installed with 0’’ (0 cm) clearance to combustibles. Heating ducts for furnaces with
heating capacities greater than 20kW must have a 1’’ (25 mm) clearance to combustibles for the
fi rst 36” (91.4 cm) of duct. Thereafter the clearance can be 0’’ (0 cm).
Duct connections to the furnace - The duct connection to the furnace is a critical aspect to
ensure the satisfactory performance of this furnace. To reduce the transmission of noise and
vibrations it is recommended to use non-flammable fl exible isolation collars. Correct duct sizing
and installation methods will ensure proper airflow providing comfortable balanced delivery of the
air. All duct work should be designed, fabricated and installed in accordance with all national
and/or local codes.
Air Filters - Included with this furnace is a 20” x 20” x 1” disposable air fi lter and supporting fi lter
rack. This fi lter rack shall be secured to the top of the furnace just below the return air plenum (see
figure 1). The use of pleated fi lters is not recommended unless sized to suit the airflow
requirements for the installation. Pleated air fi lters tend to increase total system static pressures.
This may result in reduced airflow. As a result, the heating elements may operate at increased
temperatures resulting in an overheat situation. Airflow reductions may also occur during cooling
cycles resulting in unacceptably low delivered air temperatures.
4.0 ELECTRICAL CONNECTIONS
HIGH VOLTAGE CONNECTIONS
Line power 240Vac single phase 60Hz must be brought in to the furnace control compartment via
the knockout provided on the right hand or left hand side of the furnace. The use of any other entry
point may result in the high voltage leads encountering low voltage circuit components resulting
in potentially hazardous conditions. Power lines must be connected to the furnace main terminal
block.
Refer to Section 6 to determine proper wire sizing. A ground connection is provided in this
compartment. Always ensure that the ground circuit is installed to meet the requirements of all
local and national codes.
FAN MOTOR CONNECTIONS.
All furnaces are provided with multi speed direct drive PSC or ECM motors. Furnaces up to and
including 23kW outputs are provided with 1/3hp PSC or 1/2hp ECM, 5 speed motors. 27kW
furnaces are provided with 3/4hp 5 speed motors.

7
LOW VOLTAGE CONNECTIONS
Contained within the control enclosure is the low voltage transformer. This is a 240Vac primary
with 24Vac secondary, 40VA class 2 transformer. It provides power to the furnace controller,
thermostat, A/C or heat pump compressor relay and 24Vac external devices. Always ensure that:
•The load imposed by external devices does not exceed 40 VA (1A);
•The low voltage wires connected to the board (on the front of the unit) must not make
contact with the cabinet.
Low Voltage Control Connections
T
erminal
Description
Purpose
GTHERMOSTAT INPUT FAN ON
WTHERMOSTAT INPUT STAGE 1 ELECTRIC HEATING
W2 THERMOSTAT INPUT STAGE 2 ELECTRIC HEATING
ROUTPUT TO THERMOSTAT ONLY 24Vac - GENERAL POWERING OF THE
THERMOSTAT
Y/Y1 THERMOSTAT INPUT STAGE 1 AC/HP COMPRESSOR
Y2 THERMOSTAT INPUT STAGE 2 AC/HP COMPRESSOR
COUTPUT TO THERMOSTAT 24Vac COMMON
5.0 PANEL DISPLAY, SWITCHES AND CIRCUIT BREAKER
LED INDICATIONS
Located in the upper front right-hand side of the furnace is the multi-color indicating LED light.
No LED: No power - Check Circuit Breaker.
Solid Red LED - Fault.
Solid Green - Standby Mode.
Solid Amber - Furnace in Quiet Comfort Mode.
1 Green Flash, Pause - STAGE 1 ELECTRIC HEATING
2 Green Flashes, Pause - STAGE 2 ELECTRIC HEATING
3 Green Flashes, Pause - FAN ON
1 Green Flash, 1 Amber Flash, Pause - HEATING & HP COMPRESSOR - DEICING MODE
1 Amber Flash, Pause - STAGE 1 AC/HP COMPRESSOR
2 Amber Flashes, Pause - STAGE 2 AC/HP COMPRESSOR
1 Red, 1 Green Flash, Pause - Input Error on W and W2 Terminals
1 Red, 1 Amber Flash, Pause - Input Error on Y and Y2 Terminals
Should the LED display RED, this may be an indication that the positions of the DIP switches have
either been changed or that the control board itself has failed. Make sure the DIP switches
positions are correct and fully seated (details on next page). Reset power and if the LED remains
constant Red, a qualified service technician should inspect the appliance .

8
OPERATION OPTIONS DIP SWITCHES 1, 2, 3 AND 4 (refer to wiring diagram on page 13)
DIPswitches positionsettings:
DIP 1: Must be set to OFF
DIP 2: Must be set to OFF
DIP 3 set to OFF: No HP coil or HP coil in return
DIP 3 set to ON: HP Coil in supply (Default)
DIP 4: Must be set to OFF
OPERATION OPTIONS DIP SWITCHES A, B, C
These switches are used to select the correct kW/H output of the furnace. See chart below.
BTU SETTING
T
ABLE (
DIP
OPTION SWITCHES)
DIP 5KW 10KW 15KW 18KW 20KW 23KW 27KW
A
OFF
ON
OFF
O
N
OFF
ON
OFF
BOFF OFF ON ON OFF OFF ON
C
OFF
OFF
OFF
O
FF
ON
ON
ON
OPERATION OPTION DIP SWITCH D - QUIET COMFORT FEATURE
When the Quiet Comfort Feature has been activated at DIP switch D and the continuous circulation
fan switch is in the ON position, the LED light on the front of the furnace will fl ash AMBER. This
feature will activate one of the heating elements at 50% of its capacity for a maximum period
of three (3) hours unless a call for heat is made by the thermostat, which will reset the three
(3) hour timer. The feature allows for preheated continuous circulating air to provide added
comfort in the home.
DEICING MODE (WITH HEAT PUMP ONLY)
When this unit is installed in accordance with a heat pump unit. While the heat control enters its
deicing cycle, depending on the position of DIP Switch 3 (explained above in the DIP Switches
Position Settings) the furnace control will activate one or more electric elements to generate heat
to mitigate the cooling of circulating air caused by the heat pump deicing cycle.
CIRCUIT BREAKERS
The 16A furnace mounted circuit breaker on the front of the appliance provides fan motor over
amp protection. This circuit protection only applies to the fan motor.
The higher amperage heating element circuit breaks provide overload circuit protection in the event
one or more of the heating elements should fail. Should this happen, one or more of the circuit
breakers will trip to the off position. Do not attempt to reset the breaker or access the control
panel. Call a licensed servicing contractor immediately.
Warning
Do not use these circuit breakers the power off to the furnace. Prior to removing any of the furnace access
panels ensure that the power has been safely turned off at the main electrical disconnect switch.
.

9
COMFORTMAX MODE
The ComfortMax exclusive feature is designed to provide automatic system kW/H output sizing
when operated by a single stage thermostat. When using a 2 stages thermostat, the 2nd stage of
the thermostat heat call takes priority. To activate The ComfortMax feature, set the ComfortMax
switch on the furnace to ON. This will provide automatic kW/H output of the furnace up to the
maximum output of the furnace.
ComfortMax is a unique feature of the Conforto electric furnace control. Using a single-stage
heating thermostat, the furnace control will determine the ideal number of elements to engage
during each heating cycle. Comfort is maximized by ensuring that the perfect level of heat is
supplied to satisfy the call for heat in regular intervals. On the coldest of days all available
heating elements will be activated, but on those milder days only a few will come on, thus fi nding
the perfect balance between energy use and homeowner comfort.
The ComfortMax option for heating is selected by a switch on the front panel of the appliance.
When the switch is activated during a call for heat the control will only activate the number of
elements that are estimated to be needed to satisfy the call for heat within a 13 to 18-minute period.
If the call for heat is satisfied in less than 13 minutes the number of heating elements activated during
the next cycle will be reduce by one. If the last heat cycle has been activated for more than 18
minutes an additional heating element will be energized and this number of elements will be
energized during the next heating cycle.
If the heating cycle is still not satisfied after 23 minutes then all remaining heating elements are
energized and a further heating element is added to the next heating cycle.
Fig 3

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6.0 TECHNICAL INFORMATION
KLE SERIES WITH 230V PSC MOTOR
MODEL NUMBER KLE-01-
G010-03
KLE-01-
G015-03
KLE-01-
G018-03
KLE-01-
G020-03
KLE-01-
G023-03
KLE-01-G027-05
POWER, total (kW) 10 15 18 20 23 27
POWER, first stage (kW) 5 10 9 10 15 15
OUTPUT – BTU/h 34140 51216 61460 68288 78530 92190
Temperature rise – range
o
F
****
30-45 45-60 55-75 60-80 65-80 50-80
ELECTRICAL
ELEMENT NO. 1 (kW/h) 5 5 5 5 5
5
ELEMENT NO, 2 (kW/h) 5 5 4 5 5 5
ELEMENT NO. 3 (kW/h) - 5 5 5 5 5
ELEMENT NO. 4 (kW/h) - - 4 5 4 4
ELEMENT NO. 5 (kW/h) - - - - 4 4
ELEMENT NO. 6 (kW/h) - - - - - 4
HEATING ELEMENT AMPS 40 60 80 89 92 108
TOTAL AMPS 42 62 82 91 94 114
MINIMUM CIRCUIT AMPS 60 85 100 110 125 150
BREAKER SIZE AMPS (MAX) *** 60 90 100 125 125 150
WIRE SIZE (AWG)** 4 4 3 3 2 1
MOTOR
1/3 HP - 3 speeds 3/4 HP - 4 speeds
MOTOR VOLTAGE / AMPS. 230V - 1.9A 230V - 5.8A
BLOWER DATA (Factory adjusted to 0.5 E.S.P.)
BLOWER SPEED @ 0.50'' E.S.P. MED MED MED MED HIGH MED
BLOWER SPEED @ 0.20'' E.S.P. MED MED MED MED HIGH MED
NOM. BLOWER SIZE (dia. x width) 10 x 8 12 x 10
GENERAL
INFORM
A
TION
DIMENSIONS (W x D x H) 21½'' x 44'' x 34½''
WARM AIR PLENUM 20'' x 20''
RETURN AIR PLENUM 18½'' x 18½''
AIR FILTER – 1 SUPPLIED 20'' x 20'' x 1''
SHIPPING WEIGHT 50 KG (110lbs.)
MAXIMUM COOLING CAP. up to 3 tons up to 5 tons
**** Adjust blower speed or plenum restriction to generate temperature rise within specified range.
*** Suggested circuit breaker or fuse size only, check with local codes for proper circuit breaker or fuse sizing.
** Suggested wire size only, check with local codes for proper wire sizing.
Airflow (CFM) - 10 x 8 Blower with 1/3 PSC motor
Blower Speed Motor
Wire Color
External Static Pressure
0.2 0.3 0.4 0.5 0.6
HIGH, Black BLACK 1100 1050 1000 950 875
MEDIUM, Blue BLUE 925 875 850 825 775
LOW, Red RED
Airflow (CFM) - 12 x 10 Blower with 3/4 PSC motor
Blower Speed Motor Wire
Color
External Static Pressure
0.2 0.3 0.4 0.5 0.6
HIGH BLACK 1775 1725 1650 1600 1550
MED-HIGH YELLOW 1600 1575 1550 1500 1450
MEDIUM BLUE 1450 1425 1400 1350 1325
LOW RED
Note: Maximum discharge air temperature: 93
°
C (200
°
F)