Granby KHE-00-G010-03 Setup guide

Installation, Operation and Service
Manual
Conforto
Electric
Furnace
KHE 10 TO 27kW
INSTALLATIONS MUST MEET ALL LOCAL AND FEDERAL CODES THAT MAY
DIFFER FROM THIS MANUAL
Please read the complete manual 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.
02-13-2018 G2018-A1 Rev. A

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TABLE OF CONTENTS
1.0 IMPORTANT SAFETY ADVICE 3
2.0 PRODUCT INFORMATION 3
3.0 INSTALLATION 4
4.0 HIGH VOLTAGE CONNECTIONS 6
5.0 PANEL DISPLAY, SWITCHES AND CUICUIT BREAKER 7
6.0 TECHNICAL INFORMATION 10
7.0 HEATING OUTPUT RATES BY STAGES 11
8.0 COMMISIONING CHECKLIST 11
9.0 KHE SERIES ELECTRICAL FURNACE 12
10. WIRING DIAGRAM – PSC & ECOTECH RESCUE MOTORS 13
11 EXPLODED VIEW KHE 14

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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 KHE 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
KHE 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.
2.0 PRODUCT INFORMATION
The Conforto KHE warm air electric furnace is a multi-positional design allowing for an
installation in the up flow, down flow or horizontal
fl ow positions. This appliance may be used
with a central heat-pump or central cooling system.

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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 0.60” 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 115Vac 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.
A non-combustible base is needed for counter
fl ow installations on combustibles floors.
Adequate access must be provided at the front of this furnace for service.
ATTENTION: the front of the appliance must always remain accessible to allow maintenance
and service.
For horizontal installations, it is recommended to use steel angle support brackets with threaded
rods supporting the unit from the bottom. Refer to Figure 1.

5
Due to the hazardous nature of electrical and mechanical requirements only trained and
qualified personnel should install and service heating and cooling equipment.
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. Fig 1
Horizontal Installation
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.
These furnaces are suited for vertical up flow, down flow and horizontal installations. This furnace
shall not be installed on its front or back. To install this unit on its front or back would result in
inadequate access for servicing. Always ensure that when suspending this furnace that suitable
structural support is available and provides adequate access to the control and fan
compartments for service.
Note : Return air opening must be cut out
to knockouts provided. Minimum return air
opening size, 18’’ X 18’’
Caution : Return air openings shall not be
installed in back panel.
Supply air plenum must be constructed of
suitable materials and sized by installing
contractor so as to be of sufficient strength
to support furnace and accessory fittings
and materials.
Minimum 1’’ x 1’’ x 1/8’’ angle
Note : Field selected suspension
materials must be sized by the installing
contractor and be of sufficient strength to
support air handler weight of 100 lbs and
connected accessory fittings and
materials
.
Upflow Installation
Counterflow Installation
Return air knock out.

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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 furnace casing on either side or the bottom. Do not
install this fi lter rack on the front or back of the furnace, doing so will result in inadequate air
fl ows. When cutting the return air opening in the furnace casing, use the square knockouts in the
side and bottom panels as reference. This will provide a free area opening of 18” x 18”. 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. 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. Only 3 speeds are connected to the controller
(the 4th and 5th speed motor lead is not connected.)

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Low voltage connections
Contained within the control enclosure is the low voltage transformer. This is 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).
Figure 2
Low Voltage Control Connections
T
erminal
Description
Purpose
GFAN RELAY THERMOSTAT INPUT
WTHERMOSTAT INPUT STAGE 1 HEATING
W2 THERMOSTAT INPUT STAGE 2 HEATING
R24Vac OUTPUT TO THERMOSTAT
ONLY GENERAL POWERING OF THE
THERMOSTAT
Y/Y1 THERMOSTAT INPUT STAGE 1 COOLING
Y2 THERMOSTAT INPUT STAGE 2 COOLING
C24Vac COMMON OUTPUT TO THERMOSTAT
5.0 PANEL DISPLAY, SWITCHES AND CIRCUIT BREAKER
Located in the upper front right-hand side of the furnace is the control panel indicating LED light.
LED Indications
A multi-color LED is located directly above the thermostat connections terminal strip. A solid
Green LED indicates that the furnace is in standby mode. A slow fl ashing (once per second)
Green LED indicates that the furnace is either in a heating or a cooling cycle. A quick flashing (5
times per second) Green LED indicates that the unit is in the cool down cycle. A solid Amber
LED indicates that the furnace is in Quiet Comfort mode.
A solid Red LED indicates that a
qualified service technician should inspect the appliance.
Operation options DIP switches 1, 2, 3 and 4 (refer to wiring diagram on page 13)
Should the LED light located at the top of the thermostat terminal strip display RED, this is an
indication that the switch positions on the options DIP switches on the controller have either
been changed of position or that the control board itself has failed.
ConfirmcorrectDIPswitchespositionsetting:
DIP 1 - OFF, DIP 2 - OFF, DIP 3 - OFF, DIP 4 - OFF
If the switch positions are correct and fully seated and the LED remains constant Red, replace
controller.

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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 and presence of ice on the outside
condenser is detected by the heat pump control, the heat control will go into its deicing mode.
During this period, the furnace will go into the heating mode to mitigate to the cooling of
circulating air caused by the heat pump deicing cycle. The front LED will then flash AMBER 2
times per second.
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 ensurethatthepower hasbeensafely turned off at the main electrical disconnect switch.
.

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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, remove the
jumper wire across W1 and W2 at the thermostat terminals on the furnace control board and 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 KHE 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
GENERAL INFORMATION
DIMENSIONS (WIDTH X DEPTH X HEIGHT) 20“ X 21“ X 36“
WARM AIR PLENUM 15“ X 18“
RETURN AIR PLENUM 18 1/2“ X 18 1/2“
AIR FILTER – 1 SUPPLIED 20“ X 20“X 1“
SHIPPING WEIGHT 48 KG (105lbs.)
COOLING CAPACITY 10 to 23kW 27kW
up to 3 TONS up to 5 TONS
KHE SERIES
MODEL NUMBER KHE-00-
G010-*3 KHE-00- G015-*3 KHE-00- G018-*3 KHE-00- G020-*3 KHE-00- G023-*3 KHE-00- G027-*5
RATINGS - kw 10 15 18 20 23 27
OUTPUT – BTU/h 34140 51216 61460 68288 78530 92190
Temperature rise – range
o
F 40-60 45-60 55-75 55-75 60-80 60-80
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
MOTOR AMPS PSC 2.2 2.2 2.2 2.2 2.2 5.8
MOTOR AMPS ECM 1.1 1.1 1.1 1.1 1.1 3.0
HEATING ELEMENT AMPS 40 60 80 89 92 108
TOTAL AMPS 43 63 83 92 95 114
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
BLOWER DATA PSC Fan motor design only (HEATING)
MOTOR H.P.-SPEEDS PSC (230V) 10-23kW - 1/3 HP 3-SPEED
27kW - 3/4 HP 3-SPEED
MOTOR H.P.-SPEEDS ECM (230V) 10-23kW - 1/2 HP 5 SPEED 27 kW - 3/4 HP 5 SPEED
BLOWER 10-23kW - G10-8 DD 27 kW - GT12-10 DD
*** 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.
* Designates Blower motor type
0for PSC motor
Hfor ECM Ecotech motor

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Static Pressure at 0.2’’ WC ∕0.5’’ WC
Blower
speed PSC 1∕3 HP PSC 3∕4 HP Blower speed ECM 1∕2 HP ECM 3∕4 HP
0.20’’WC 0.50’’WC 0.20’’WC 0.50’’WC 0.20’’WC 0.50’’WC 0.20’’WC 0.50’’WC
HIGH 1237 1150 2120 2030 HIGH 1300 1230 2000 1910
M-HIGH 1125 1053 1940 1875 M-HIGH 1225 1160 1900 1835
MEDIUM - - - - MEDIUM 1140 1050 1690 1660
M-LOW 1020 967 1710 1650 M-LOW 1025 980 1610 1575
LO 787 765 1150 1050 LO 775 750 1060 1010
Note: Maximum discharge air temperature - 93°C (200°F),
7.0 HEATING OUTPUT RATES BY STAGES
Figure 4
Stage 1 Stage 2 Stage 1 + 2
Furnace
ModelVoltage
W1 BTU Output
Total Heat W2 BTU Output Total Heat W1 + W2 BTU Output Total Heat
Power 208 240 208 240 208 240
10kW 12975 17072 -17072 25950 34144
15kW 25950 34144 12975 17072 38925 51216
18kW 20760 27315 25950 34144 46710 61460
20kW 25950 34144 25950 34144 51890 68288
23kW 25950 34144 33734 44387 59682 78530
27kW 25950 34144 44114 58045 70064 92190
8.0 COMMISIONING CHECKLIST
Ensure the following things:
1) Fan motor shipping bracket is removed from left side of furnace.
2) Thermostat is not connected to controller
3) A/C condenser is connected.
4) Ground is securely connected at furnace ground lug and main panel.
5) Incoming power lines are connected and secure at main terminal block.
6) Continuous fan switch is set to OFF
7) ComfortMax switch on furnace side panel is set to OFF.
Sequence:
1) a) Install a jumper across thermostat terminals R and W1 on control board terminal strip.
Heating cycle starts and fan turns on.
b) Allow this cycle to turn on all elements.
c) Remove jumper. All elements turn OFF.

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2) Place a jumper across R, Y/Y2 & G, fan starts on Cool speed and A/C starts.
3) Remove jumper, fan cycles down and A/C stops.
4) Power furnace down, connect thermostat, turn power to furnace on.
KHE SERIES ELECTRIC FURNACE

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ITEM NO PART NUMBER DESCRIPTION
1 6EF-FE-04KW-00,
6EF-FE-05KW-00 4KW ELEMENT C/W #10 STUD CON & NUT 5KW ELEMENT C/W #10 STUD CON & NUT
2 4SW-00-RA90-10 ROCKER SWITCH SP/ST 15AMP MARKED ON/OFF
3 4SW-00-RA90-10 ROCKER SWITCH SP/ST 15AMP MARKED ON/OFF
4 6EF-CI-BRKS-00 16A THERMAL CIRCUIT BREAKER T9-611P-16A
5 6EF-RY-DC24-00 30A 24VDC SPST MINI POWER RELAY
6 6EF-CB-SEI0-00 KHE CONTROL BOARD CM189 V1_18
7 6EF-CV-R940-00 CONTROL COVER WHITE NYLON 1/2X1X6
8 6EF-TF-230V-00 230/24/40VA TRANSFORMER CLASS 2 INH.LIM
9
6EF-33-3SPD-00
6EF-75-4SPD-00
3BM-50-ECM0-03
3BM-75-4SDD-02
1/3HP 230V 1075/3SP DD MOTOR
3/4HP 208-230 1PH, 4SPD MOTOR EMERSON #5846A (6.1)
MOTOR M055CYA0372012B NIDEC 1/2 HP DD ECM
MOTOR M055CWT0366012B NIDEC ECOTECH 3/4 HP DD ECM
10 4CA-00-705M-00
4CA-00-156M-2B CAPACITOR 7.5uF 370VAC 70C 60Hz CAPACITOR 15.0uF 370VAC 70C 60Hz
11 1SB-10-BRKT-00
1SB-12-BRKT-00 10" BLOWER BELLY BAND 12" BLOWER BELLY BAND
12 3BU-10-08DD-00
3BU-12-00DD-00 G10 X 8” DD BLOWER 9010582 GT12 X 10’’ DD BLOWER 9010236
13 6EF-BR-KR50-00 50 AMP BRKR, DOUBLE POLE, BRACKET MOUNT
14 6EF-BR-KR25-00 25 AMP BRKR, DOUBLE POLE, BRACKET MOUNT
15 6EF-SD-MCON-00 THERMAL SNAP DISC OPEN@120 CLOSE@100DEG
16 9EL-AE-0200-90 ELECTRIC BLOCK 3 POSITIONS 300V, 120AMP
EXPLODED VIEW KHE

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GRANBY FURNACES INC.
PO Box 637
12118 Hwy 209
Parrsboro, Nova Scotia, Canada
B0M 1S0
www.granbyindustries.com
Thank you for choosing Granby