Goodman AMVS96U Guide
Service and Troubleshooting
*MVS96*U
Copyright © 2020 Goodman Manufacturing Company, L.P.
RS6612018r1
June 2020
TABLE OF CONTENTS
IMPORTANT INFORMATION............................................ 2
PRODUCT IDENTIFICATION ........................................... 4
SYSTEM OPERATION...................................................... 6
SCHEDULED MAINTENANCE ....................................... 21
SERVICING..................................................................... 24
CHECKING VOLTAGE .............................................. 25
CHECKING WIRING .................................................. 25
CHECKNG THERMOSTAT, WIRING ........................ 25
CHECKING TRANSFORMER AND CONTROL
CIRCUIT...................................................................... 25
CHECKING AIR CIRCULATOR BLOWER MOTOR 26
CHECKING DUCT STATIC........................................ 26
CHECKING TEMPERATURE RISE .......................... 26
CHECKING PRIMARY LIMIT CONTROL................. 27
CHECKING AUXILIARY LIMIT CONTROL............... 27
INDUCED DRAFT BLOWER MOTOR ...................... 28
CECKING GAS VALVE (REDUNDANT) ................... 28
CHECKING GAS PRESSURE .................................. 28
CHECKING HOT SURFACE IGNITER ..................... 30
CHECKING PRESSURE TRANSDUCER ................ 30
CHECKING FOR DELAYED IGNITION.................... 31
CHECKING INTERGRATED IGNITION CONTROL
BOARDS ..................................................................... 31
CHECKING FLAME SENSOR................................... 31
TROUBLESHOOTING CHART ....................................... 32
WIRING DIAGRAMS....................................................... 39
Pride and workmanship go into every product to provide
our customers with quality products. It is possible, however,
that during its lifetime a product may require service.
Products should be serviced only by a qualied service
technician who is familiar with the safety procedures
required in the repair and who is equipped with the proper
tools, parts, testing instruments and the appropriate service
manual.
Cancer and Reproductive Harm -
www.P65Warnings.ca.gov
0140M00517-A
2
Pride and workmanship go into every product to provide our
customers with quality products. It is possible, however, that
during its lifetime a product may require service. Products
should be serviced only by a qualied service technician who
is familiar with the safety procedures required in the repair
and who is equipped with the proper tools, parts, testing in-
struments and the appropriate service manual.
OUTSIDE THE U.S., .
(Not a technical assistance line for dealers.) Your telephone company will bill you for the call.
REVE ERISK RER ME ERS IJUR RE
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MMEIQUIS RVRSIEVIII IS IE
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IMPORTANT INFORMATION
3
B10259-216
CO can cause serious illness including permanent brain
damage or death.
Advertencia especial para la instalación de calentadores ó manejadoras
de aire en áreas cerradas como estacionamientos ó cuartos de servicio.
B10259-216
El monóxido de carbono puede causar enfermedades severas
como daño cerebral permanente ó muerte.
Las emisiones de monóxido de carbono pueden circular a través
del aparato cuando se opera en cualquier modo.
B10259-216
RISQUE D'EMPOISONNEMENT AU MONOXYDE DE CARBONE
Cette ventilation est nécessaire pour éviter le danger d'intoxication
au CO pouvant survenir si un appareil produisant du monoxyde
de carbone continue de fonctionner au sein de la zone confinée.
4
The model and manufacturing number are used for positive identication of component parts used in manufacturing.
Please use these numbers when requesting service or parts information.
PRODUCT IDENTIFICATION
5
AMVS960603BU AA
AMVS960805CU AA
, This furnace complies with the
SCAQMD Rule 1111 14 ng/J NOx emission limit.. Up flow/Horizontal Left and Right,
Induced Draft, Nidec variable speed ECM motor. Stainless Steel tubular heat
exchanger. 115 volt silicon nitride igniter. Left or right gas entry. Line voltage EAC
terminal
GMVS960603BU AA
GMVS960805CU AA
, 1 stage gas valve. This furnace
complies with the SCAQMD Rule 1111 14 ng/J NOx emission limit.. Up flow/Horizontal
Left and Right, Induced Draft, Nidec variable speed ECMmotor. Stainless Steel tubular
heat exchanger. 115 volt silicon nitride igniter. Left or right gas entry. Line voltage EAC
terminal
6
Please adhere to the following warnings and cautions when
installing, adjusting, altering, servicing, or operating the
furnace.
REVE ERS IJURR E UE IMRERISI
JUSME ERI SERVIE RMIEE REER IS
MUR II SSISERIRMISU
QUIIE ISERSERVIE ER E SSUIER
REVE SSIE RER ME ERS IJURR E
UE EERI SK EUREMUS EE RE
EEERI MES RMWER
Discharge your body’s static electricity before touching
unit. An electrostatic discharge can adversely aect electrical
components.
Use the following precautions during furnace installation
and servicing to protect the integrated control module from
damage. By putting the furnace, the control, and the person
at the same electrostatic potential, these steps will help
avoid exposing the integrated control module to electrostatic
discharge. This procedure is applicable to both installed and
uninstalled (ungrounded) furnaces.
1. Disconnect all power to the furnace. Do not touch the
integrated control module or any wire connected to the
control prior to discharging your body’s electrostatic
charge to ground.
2. Firmly touch a clean, unpainted, metal surface of the
furnace near the control. Any tools held in a person’s
hand during grounding will be discharged.
3. Service integrated control module or connecting wiring
following the discharge process in Step 2. Use caution
not to recharge your body with static electricity; (i.e., do
not move or shue your feet, do not touch ungrounded
objects, etc.). If you come in contact with an ungrounded
object, repeat Step 2 before touching control or wires.
4. Discharge any static electricity from your body to ground
before removing a new control from its container. Follow
Steps 1 through 3 if installing the control on a furnace.
Return any old or new controls to their containers before
touching any ungrounded object.
This product is designed for use as a residential home gas
furnace. It is designed or certied for use in mobile home,
trailer, or recreational vehicle applications.
In the U.S.A., this furnace can be used in the following non-industrial
commercial applications: Schools, Oce buildings, Churches, Retail
stores, Nursing homes, Hotels/motels, Common or oce areas. In
all applications, the furnace must be installed per the installation
instructions.
Goodman®brand GMVS96*U and Amana®brand AMVS96*U
furnaces are ETL certied. All *MVS96*U furnaces are built
for use with Natural gas only & may not be converted for use
with LP gas.
Goodman®brand GMVS96*U and Amana®brand AMVS96*U
high eciency furnaces are dual certied. Dual certication
means that the combustion air inlet pipe is optional and the
furnace can be vented as a:
• Non-direct vent (single pipe) central forced air furnace
in which combustion air is taken from the installation
area or from air ducted from the outside or,
• Direct vent (dual pipe) central forced air furnace in
which all combustion air supplied directly to the furnace
burners through a special air intake system outlined in
this manual and the installation instructions.
To ensure proper installation, operation and servicing,
thoroughly read the installation and service manuals
for specics pertaining to the installation, servicing and
application of this product.
SSIE RER MEERSIJUR R E UE IRE
EXSI SMKE S ESIEERI SK RR
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RMIEE IS RU
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To ensure proper furnace operation, install, operate, maintain
and service the furnace in accordance with the installation,
operation and service instructions, all local building codes
and ordinances. In their absence, follow the latest edition of
the National Fuel Gas Code (NFPA 54/ANSI Z223.1), and/or
CAN/CGA B149 Installation Codes, local plumbing or waste
water codes, and other applicable codes.
All *MVS96*U furnaces must have an EMI Filter installed.
Early production furnaces will require the EMI lter to be
eld installed at the time of furnace installation as furnaces
are shipped without this component. The kit (EMIULN-1) is
available from your furnace distributor at no cost.
The purpose of the EMI Filter is to reduce electromagnetic
interference between the furnace and other electrical devices.
SYSTEM OPERATION
7
A copy of the National Fuel Gas Code (NFPA 54/ANSI Z223.1)
can be obtained from any of the following:
American National Standards Institute
25 West 43rd Street, 4th Floor
New York, NY 10036
National Fire Protection Association
1 Batterymarch Park
Quincy, MA 02169-7471
CSA International
8501 East Pleasant Valley
Cleveland, OH 44131
A copy of the CAN/CGA B149 Installation Codes can be
obtained from:
CSA International
178 Rexdale Boulevard
Etobicoke, Ontario, Canada M9W, 1R3
The rated heating capacity of the furnace should be greater
than or equal to the total heat loss of the area to be heated.
The total heat loss should be calculated by an approved
method or in accordance with “ASHRAE Guide” or “Manual
J-Load Calculations” published by the Air Conditioning
Contractors of America.
46
290 85 80 75 70 65 60 55
3158 151 144 137 130 123 116 109
255 50 45 40 35 30 25 20
3151 144 137 130 123 116 109 102
*MVS960603BUU
*MVS960805CU
1) Maximum allowable limits listed on individual lengths for inlet and ue and NOT
a combination.
2) Minimum requirement for each vent pipe is ve (5) feet in length and one elbow/
tee.
3) Tee used in the vent/ue termination must be included when determining the
number of elbows in the piping system.
4) 2 1/2” or 3” diameter pipe can be used in place of 2” diameter pipe.
5) Increased Clearance Congurations using (2) 45 deg. Long Sweep elbows should
be considered equivalent to one 90 deg. elbow.
6) One 90° elbow should be secured to the combustion air intake connection.
EREE UREWI ERI REMVES
REIRUI E UE SESMUR
W
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URERESURE
IURE W ISWRI RESUI
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A condensing gas furnace achieves its high level of eciency
by extracting almost all of the heat from the products of
combustion and cooling them to the point where condensation
takes place. The condensate which is generated must be
piped to an appropriate drain location.
I URIUWISIS E RIR MUS EMUE
E SIESIE EUI RMEJUI X ISWI
REUEERISK WERREI EJUI XI EEVE
KERI IIIURE W ESEISRUIS
RESU I SSIE RERMEERSIJURR E
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• If the drain line is routed through an area which may
see temperatures near or below freezing, precautions
must be taken to prevent condensate from freezing
within the drain line.
• If an air conditioning coil is installed with the furnace,
a common drain may be used. An open tee must
be installed in the drain line, near the cooling coil, to
relieve positive air pressure from the coil’s plenum.
This is necessary to prohibit any interference with the
function of the furnace’s drain trap.
Horizontal installations require 5.5” under the furnace
to accommodate the drain trap. The horizontal furnace
must be installed with ¾” slope from back to front to permit
condensate ow towards the front of the furnace.
When installing a *MVS9* horizontally with the left side
down, there are two options for connecting the vent pipe to
the furnace.
Option 1
Venting may be connected to the furnace vent pipe tting on
the original top (now the end) of the furnace.
Option 2
The internal vent pipe and elbow may be removed from the
furnace to permit the vent to exit the top (original side) of
the furnace. If this option is used, an RF000142 Vent-Drain
coupling must be used to keep condensate from collecting
in the inducer assembly.
To install the drain, refer to the following instructions and
illustration.
SYSTEM OPERATION
8
COMBUSTION AIR INTAKE PIPE OPTIONS:
The RF000142 coupling can be secured directly to the
furnace intake coupling if condensation is occurring in the
combustion air inlet pipe. If the RF000142 is used on the
combustion air inlet, it must be installed with the arrow
pointing up. It should be noted, the combustion air will
actually be moving in a direction opposite of the arrow on the
RF000142 coupling.
Alternatively a tee may be used in the combustion air
intake pipe for the same purpose. If either option is used,
a eld supplied trapped drain tube, free-draining to proper
condensate disposal location must be present. A loop in the
drain tube can serve as a trap. The unused RF000142 drain
tting should be capped.
1. Remove screws from vent ange.
2. Remove internal elbow and vent pipe.
3. Cut pipe 2 1/2” from ange.
4. Remove cabinet plug adjacent to inducer outlet and
install an original cabinet vent hole.
5. Install RF000142 coupling on inducer outlet.
6. Install anged vent section removed in step 2 and se-
cure with clamps.
7. Secure ange to cabinet using screws removed in step
1.
Insert flange. Cut 2 ½” long.
R 000142F
The furnace rating plate includes the approved furnace gas
input rating.
REVEUREIEERIREQUIMEMEEIE
SSU RESSUREMUS E SSEIIE EUIRI E
WI ER USE SIRE IES ERI
Inlet gas supply pressures must be maintained within the
ranges specied below. The supply pressure must be constant
and available with all other household gas red appliances
operating. The minimum gas supply pressure must be
maintained to prevent unreliable ignition. The maximum must
not be exceeded to prevent unit overring.
Minimum: 4.5" w.c. Maximum: 10.0" w.c.
This unit is equipped with a 24 volt gas valve controlled during
furnace operation by the integrated control module. Taps for
measuring the gas supply pressure and manifold pressure
are provided on the valve.
The gas valve has a manual ON/OFF control located on
the valve itself. This control may be set only to the “ON” or
“OFF” position. Refer to the Lighting Instructions Label or the
“Putting the Furnace Into Operation” section of this manual or
the installation instructions for use of this control during start
up and shut down periods.
Length of Nominal Black Pipe Size
Pipe in Feet 1/2" 3/4" 1" 1 1/4" 1 1/2"
132 278 520 1050 1600
92 190 350 730 1100
73 152 285 590 980
63 130 245 500 760
56 115 215 440 670
50 105 195 400 610
46 96 180 370 560
43 90 170 350 530
40 84 160 320 490
38 79 150 305 460
CFH =
(Pressure 0.5 psig or less and pressure drop of 0.3" W.C.; Based on 0.60
Specific Gravity Gas)
BTUH Furnace Input
Heating Value of Gas (BTU/Cubic Foot)
SYSTEM OPERATION
9
Before placing unit in operation or after servicing, leak test
gas connections.
VIE SSII EXSIR IRE EVERUSE M
RE ME ES R EKS
Check for leaks using an approved chloride-free soap and
water solution, an electronic combustible gas detector, or
other approved testing methods.
Never exceed specied pressures for testing. Higher
pressure may damage the gas valve and cause subsequent
overring, resulting in heat exchanger failure. Disconnect
this unit and shuto valve from the gas supply piping system
before pressure testing the supply piping system with
pressures in excess of 1/2 psig (3.48 kPa). Isolate this unit
from the gas supply piping system by closing its external
manual gas shuto valve before pressure testing supply
piping system with test pressures equal to or less than 1/2
psig (3.48 kPa).
I
EIRMI IESEISRUISIS WE EX
IRE REXSI M RESUUSI RER ME ERS
IJUR R SS IE
–
D
O NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND
LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE.
–
W
I
U
SME
S
•
D
O NOT TRY TO LIGHT ANY APPLIANCE.
•
D
O NOT TOUCH ANY ELECTRICAL SWITCH; DO NOT USE ANY
PHONE IN YOUR BUILDING.
•
I
MMEDIATELY CALL YOUR GAS SUPPLIER FROM A NEIGHBOR’S
PHONE.
F
OLLOW THE GAS SUPPLIER’S INSTRUCTIONS.
•
I
F YOU CANNOT REACH YOUR GAS SUPPLIER, CALL THE FIRE
DEPARTMENT.
–
I
NSTALLATION AND SERVICE MUST BE PERFORMED BY A QUALIFIED INSTALLER,
SERVICE AGENCY OR THE GAS SUPPLIER.
The furnace, as shipped, requires no change to run between
0-4500 feet. At all altitudes the air temperature rise must
be within the range listed on the the Specication Sheet
applicable to your model for the fuel used. Manifold pressure
adjustments and combustion analysis are required for all
installations above 4500 ft. Refer to “Gas Supply Pressure
Measurement” section for instruction on how to properly
measure and adjust manifold “outlet” pressure. The furnace
should operate for a minimum of 15 minutes before taking
a combustion sample. Combustion samples should be
taken from beyond the furnace exhaust and must be within
provided CO2% range. See table below for recommended
manifold pressure adjustments and proper CO2% range. Gas
heating values can vary; further pressure adjustment may
be necessary to ensure furnace operates within acceptable
CO2 range.
MODEL
Manifold
Pressure
at 5000 ft
Manifold
Pressure
at 7500 ft
CO2%
Natural
Gas
Max Allowable
Venting (3 in
only)
*MES960403BU 100 ft
*MES960603BU 100 ft
*MES960805CU 80 ft
2.5" w.c. 2.4" w.c. 6.5 - 8.5
VIERISK EERI SK WIRI EUI MUSE
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SYSTEM OPERATION
10
Low voltage connections can be made through either
the right or left side panel. Wire routing must not interfere
with circulator blower operation, lter removal, or routine
maintenance.
A 40 V.A. transformer and an integrated electronic control are
built into the furnace to allow use with most cooling equipment.
Consult the wiring diagram, located in the Technical Manual
or on the blower door for further details of 115 Volt and 24
Volt wiring.
The single stage furnace will have a “W” terminal and will use
a single stage thermostat. The following drawing illustrates
the typical eld wiring for a heat only single stage system and
a single stage heating/single stage cooling system. Refer to
the following gures for proper connections to the integrated
control module.
EXTREMELY IMPORTANT: This system does not contain
an O wire input (reversing valve signal). If a heat pump is
installed, the thermostat should be setup for single stage
heat/single stage cool installs ( W= Heat Call and Y = Cool
Call). Setting thermostat for heat pump control will result in
incorrect performance.
1) Connect all necessary thermostat wires to the
thermostat connector on the furnace control (only
available connections on the furnace are R & C for
power, Y for Cooling Calls, W for Heating Calls, G for
Fan Calls, Dehum for Dehumidication Calls. Furnace
will control staging of indoor unit and outdoor unit
automatically based on these inputs).
2) Make sure thermostat is set to single stage heat / single
stage cool mode. When a cool call is given, 24VAC
should be applied to the Y terminal (G will have 24VAC
as well if a G wire is installed). When a heat call is given
24VAC should be applied to the W terminal (G may
have 24VAC as well if a G wire is installed). Even if a
heat pump is installed, do not setup the thermostat in
heat pump mode. Single stage heat / single stage cool
mode is all that is required for all applications. See rest
of manual for any exceptions. Do not setup thermostat
in multi stage mode either, it is not necessary.
3) For communicating 2 stage AC/HP or inverter AC/
HP outdoor units, connect the 1&2 wires between the
indoor and outdoor unit. It is recommended for 2 stage
applications that a separate transformer be installed
in the outdoor unit to provide 24VAC to the outdoor
control. R&C can be used between the indoor and
outdoor in 2 stage AC application but only if there isn’t
already a transformer installed in the outdoor unit.
4) Turn on power to Indoor and Outdoor units
5) Charging outdoor unit: Provide a cooling call (Y or
Y+G) – this initial cooling call after the power is turned
on will run the outdoor unit at full capacity until the call
is removed. Use this mode for charging. If system is
running low stage cooling just cycle power and provide
a cool call again to ensure full capacity cooling.
6) System Testing: Download the CoolCloudHVAC phone
application (see pages 31 and 32)and use it to test all
operations of both indoor and outdoor units.
7) Conrm thermostat heat (W or W+G) and cool (Y
or Y+G) function properly and the system is turning
on in the correct mode. The internal algorithms will
constantly be adjusting the staging times / cooling
capacities based on load changes to the space.
: If a heat pump is installed it will be treated as a
priority heat for a W call. To test gas heat only, without
waitng for the system to stage between the heat pump
and furnace, disconnect communications between the
indoor and outdoor unit before running the heating test.
The furnace contains internal logic to control equipment
staging. An adjustable target runtime is available (range from
1 to 240 minutes) and set through the appropriate system
menu. The system will constantly be adjusting staging in an
eort to satify the thermostat call for cooling (Y only) or heating
(W Only) as close to the set target runtime as possible. See
information below for setting options.
SYSTEM OPERATION
11
during the next cycle. If
the heat pump can satisfy the thermostat in less
than the System Target Runtime the temporary
heat pump hold will be completely removed and
the heat pump will become the primary heat
source again. if it fails to do so, the strike count
against the furnace will be reset and the furnace
will remain the temporary primary heat source
until the Under Target Threshold is reached again.
The system will automatically make adjustments in an attempt
to satisfy the thermostat as close to this target runtime as
possible. After a power cycle or mode change (cooling to
heating or heating to cooling) the system will run full capacity
for the selected mode during the rst thermostat call. Based
on the selected target runtime and how long the initial cycle
takes to satisfy the thermostat, the control algorithm will adjust
the system stage times for a 2 stage unit or the capacity
demand percentage for an inverter / modulating unit for the
next cycle. Note: actual runtimes may change depending on
variations of load throughout the day.
The following table shows the default values for all
Comfort Setting Options (1 – 5)
Comfort
Setti ng
Opti on
Target
Ti me
(Minutes)
Stage Up
Percentage
(%)
Stage Down
Percentage
(%)
Over Target
Threshhold
(Strike Count)
Under Target
Threshhold
(Strike Count)
110 20 20 210
215 20 20 4 8
320 20 20 6 6
425 20 20 8 4
530 20 20 10 2
The following table shows the ranges for each of item
when the adjustable Comfort Setting Option 6 is selected.
The table shows the minimum value, the maximum value
and the defaulted value. All items can be adjusted up or
down by increments of 1 which provides full exibility
for all items. Note: it is critical that these numbers be
set properly. If Comfort Setting option 3 is desired but
a target time of 60 is preferred, select Comfort Setting
Option 6 to enable all the adjustable menus, set the Target
Time to 60 and make sure the other menus are set to
match that of Comfort Setting Option 3.
Menu Minimum Value Maximum Value Default Value
Target Time (t9t) 1 minute 240 minutes 60 minutes
Stage Up Percent (SUP) 0% 100% 20%
Stage Down Percent (SdP) 0% 100% 20%
Over Target Threshold (Ott) 1 strike 254 strikes 20 strikes
Under Target Threshold (Utt) 1 strike 254 strikes 20 strikes
SYSTEM OPERATION
12
Tonnage
Selection
Airflow
Tonnage
Selection
Airflow
Tonnage
Selection
Airflow
Tonnage
Selection
Airflow
1400
2.3 920 3.6 1440 4.9 1960
1.1 440 2.4 960 3.7 1480 52000
1.2 480 2.5 1000 3.8 1520 5.1 2040
1.3 520 2.6 1040 3.9 1560 5.2 2080
1.4 560 2.7 1080 41600 5.3 2120
1.5 600 2.8 1120 4.1 1640 5.4 2160
1.6 640 2.9 1160 4.2 1680 5.5 2200
1.7 680 31200 4.3 1720 5.6 2240
1.8 720 3.1 1240 4.4 1760 5.7 2280
1.9 760 3.2 1280 4.5 1800 5.8 2320
2800 3.3 1320 4.6 1840 5.9 2360
2.1 840 3.4 1360 4.7 1880 62400
2.2 880 3.5 1400 4.8 1920
The multi-circulator blower also offers several custom
ON/ OFF ramping proles. These proles may be used to
enhance cooling performance and increase comfort level.
The ramping proles are selected using the Cooling Airow
Prole menu (if push buttons are used, use the CAP menu
to select the desired prole). Refer to the bullet points below
for a description of each ramping prole.
OFF
100% CFM
Cooling Demand
100% CFM
1 min
OFF
• provides only an OFF delay of one (1) minute at 100% of the cooling demandProfile A(1)
Cooling Demand
50% CFM
1/2 min
100% CFM 100% CFM
1 min
OFF OFF
• ramps up to full cooling demand airflow by first stepping up to 50% of the full
demand for 30 seconds. The motor then ramps to 100% of the required airflow. A one (1)
minute OFF delay at 100% of the cooling airflow is provided.
Profile B(2)
1 min
100% CFM85% CFM
7 1/2 min
Cooling Demand
100% CFM
OFF OFF
• ramps up to 85% of the full cooling demand airflow and operates there for
approximately 7 1/2 minutes. The motor then steps up to the full demand airflow. Profile C
also has a one (1) minute 100% OFF delay.
Profile C(3)
85% CFM
7 1/2 min
100% CFM 50% CFM
1/2 min
50% CFM
Cooling Demand
1/2 min
OFF
OFF
• ramps up to 50% of the demand for 1/2 minute, then ramps to 85% of the full
cooling demand airflow and operates there for approximately 7 1/2 minutes. The motor
then steps up to the full demand airflow. Profile D has a 1/2 minute at 50% airflow OFF delay.
Profile D(4 or 5)
In general lower heating speeds will: reduce electrical consumption,
lower operating sound levels of the blower, and increase the outlet
air temperature delivered to the home if heatmode is running.
If cooling mode is running the same airow adjustment will
decrease the outlet air temperature delivered to the home.
The speeds available allow the blower performance to be
optimized for the particular homeowner’s needs.
The Furnace functions with any thermostat that can be
congured to provide 24VAC on Y for cooling calls and 24VAC
on W for Heating calls. Based on these simple inputs, internal
algorithms will decide how to control two stages of furnace
heat in addition to any single or multi stage outdoor heating /
cooling operation (the algorithms will handle dual fuel multi-
stage systems as well). The thermostat must be setup to
provide only a Y call when cooling is required and only a W
call when heating is required. This is generally accomplished
by selecting single stage heat / single stage cool mode during
setup (if setup is required). Do not set thermostat to heat
pump operation as system will not operate properly.
Note: The only exception is if a single stage non-communicating
Heat Pump is connected to the furnace. Refer to Non-
Communicating Single Stage Heat Pump diagram for details.
Thermostat connections to the control board are R, C, G,
W, Y & Dehum. Provided the thermostat does not require a
common wire as few as two thermostat wires may be used
for heat only (R and W) or cool only (R and Y) systems. A
minimum three thermostat wires may be used for heating
and cooling systems (R, W and Y). Refer to thermostat wiring
diagrams below for your system conguration.
Low voltage connections can be made through either the right
or left side panel of the furnace. Thermostat wiring entrance
holes are located in the blower compartment.
SYSTEM OPERATION
13
Thermostat
Communica�ng Outdoor Unit
Condensate
Switch
Figure 35
For gas heat only operations (no outdoor unit installed) the
thermostat must be setup to provide a single stage W call
when heating is required. See Gas Heat Only wiring diagram
for wiring instructions.
R
C
G
W
Y
Dehum
Optional
Optional
INDOOR
BOARD TERMINAL
CONNECTIONS
R
C
G
W
Y
Dehum
24 VAC
Thermostat
1
2
R
C
Figure 36
Internal logic will control staging of all multi stage equipment (2
stage AC/HP units and Inverter AC/HP units). The thermostat
is only required to provide a single stage heat / cool call and
fan or dehumidication call during operation.
Two wires are required between the indoor unit and outdoor
unit on the 1 and 2 terminals. It is recommended to install a
separate transformer with all 2 stage outdoor units to reduce
the power draw on the indoor transformer.
4 wires (R,C for power and 1, 2 for communications) can be
used for AC applications. See wiring images for details.
Do not connect R & C between the indoor unit and the outdoor
unit if there is already a transformer installed in the outdoor
unit providing 24VAC to the outdoor control. In this case, just
use 1 and 2 terminals for communcations
R
C
G
W
Y
Dehum
Optional
Optional
Optional if
feature
supported by
thermostat
L1
L2
INDOOR
BOARD TERMINAL
CONNECTIONS
OUTDOOR
BOARD TERMINAL
CONNECTIONS
OUTDOOR
TRANSFORMER
24VAC 240V
GROUND RECOMMENDED
(FIELD PROVIDED)
1
2
R
C
R
C
G
W
Y
Dehum
1
2
R
C
Note:for 2 Stage Air Conditioners, R & C wires can
be used between the indoor and outdoor units provided
a transformer is not already installed in the outdoor unit.
For 2 stage heat pumps, a transformer is always required
in the outdoor unit (R & C connections cannot be used)
Figure 37
1
2
R
C
R
C
G
W
Y
Dehum
Optional
Optional
Optional if
feature
supported by
thermostat
INDOOR
BOARD TERMINAL
CONNECTIONS
OUTDOOR
BOARD TERMINAL
CONNECTIONS
1
2
R
C
R
C
G
W
Y
Dehum
24 VAC
Thermostat
Figure 38
When using the furnace with a single stage non-communicating
air conditioner or heat pump use the wiring methods shown.
When using a single stage air conditioner, the thermostat must
be setup for single stage heating and single stage cooling
mode. When using a single stage heat pump, the thermostat
must be setup for dual fuel operation where the reversing
valve is energized in cooling mode (see Non-Communicating
Single Stage Heat Pump wiring diagram). In both cases
airow must be selected using the tonnage menu where
Airow = (400 CFM) x (Selected Tonnage). Tonnage values
range from 1 to 6 in 0.1 increments.
SYSTEM OPERATION
14
NOTE: Airow will not go above the system Max CFM. If the
tonnage value selected generates an airow value above the
Max CFM, the system will cap this value and not provide any
more airow than the Max CFM.
R
C
G
W
Y
Dehum
Optional
Optional
INDOOR
BOARD TERMINAL
CONNECTIONS
R
C
G
W
Y
Dehum
24 VAC
Thermostat
1
2
R
C
Heat Pump
Optional
R
C
W
Y
This is the only
case where setting the
thermostat to heat pump
mode is acceptable.
Figure 39
R
C
G
W
Y
Dehum
Optional
Optional
Optional if
feature
supported by
thermostat
INDOOR
BOARD TERMINAL
CONNECTIONS
1
2
R
C
R
C
G
W
Y
Dehum
C
Y
Remote
Condensing Unit
(Single-Stage Cooling)
24 VAC
Thermostat
Figure 40
The control board is equipped with a 24 volt dehum input in
the thermostat wiring connector to be used with a thermostat
or dehumidistat. Dehumidification mode allows the air
handler’s circulator blower to operate at a slightly lower speed
(85% of calculated speed) during a combined thermostat
call for cooling and thermostat call for dehumidication or
dehumidistat call for dehumidication. This lower blower
speed enhances dehumidication of the conditioned air
as it passes through the AC coil. If using the dehum input
with a thermostat, congure the thermostat to energize this
terminal when dehumidication is desired. If using an external
dehumidistat, connect it between the R and Dehum terminals.
The dehumidistat must operate on 24 VAC and utilize a switch
which closes on humidity rise. Refer to the low voltage wiring
diagrams for additional wiring details.
Dehumidistat (close on humidity rise)
R
C
G
Y
Dehum
Dehumidistat
(close on humidity rise)
Figure 41
This furnace can be used in conjunction with a heat pump in a
fossil fuel application. A fossil fuel application refers to a combined
gas furnace and heat pump installation which uses an outdoor
temperature sensor to determine when to run the heat pump
or gas furnace.
For non-communicating single stage heat pump installations a
fossil fuel kit can be used. Follow the wiring guidelines in the
fossil fuel kit installation instructions. All furnace connections
must be made to the furnace integrated control module and
the “FURNACE” terminal strip on the fossil fuel control board.
SYSTEM OPERATION
15
HIGH VOLTAGE !
T
O
AVOID
PERSONAL
INJURY
OR
DEATH
DUE
TO
ELECTRICAL
SHOCK
,
DISCONNECT
ELECTRICAL
POWER
BEFORE
SERVICING
OR
CHANGING
ANY
ELECTRICAL
WIRING
.
The accessory load specications are as follows:
EAC 1.0 Amp maximum at 120 VAC
• Turn OFF power to the furnace before installing any
accessories.
• Follow the air cleaner manufacturers’ instructions
for locating, mounting, grounding, and controlling
accessories. Utilize 1/4” quick connect terminals to
make accessory wiring connections to the furnace
integrated control module.
• Connect the hot terminal utilized for accessory operation
to the EAC terminal and the neutral side of power to
NEUTRAL bus on the integrated furnace control or the
neutral connection in the furnace junction box.
• All eld wiring must conform to applicable codes.
• Connections should be made as shown.
• If it is necessary for the installer to supply additional line
voltage wiring to the inside of the furnace, the wiring
must conform to all local codes, and have a minimum
temperature rating of 105°C.
• All line voltage wire splices must be made inside the
furnace junction box.
These contacts could
also be used with compatible CO2sensors or Fire Alarms.
By default, an AUX switch is normally closed and opens
when the water level in the evaporator coil base pan
reaches an undesirable level. The control will respond
by turning o the outdoor condensing unit and display
EEd. If the AUX switch is detected closed for 30 seconds,
normal operation resumes and error messages are no
longer displayed.
CoolCloudHVAC Phone Application – General Information
SYSTEM OPERATION
16
Connecting Phone Application to Furnace
, ensure the thermostat is in an idol state (no
cool, heat or fan calls). To do this, set the thermostat
fan mode to Auto (not ON) and then remove any active
heat / cool calls. This task needs to be completed within
5 minutes of the process beginning.
, provide any 24VAC call to the control from the
thermostat (cooling, heating or fan will work). This task
must occur within 8 minutes after the Step 1 is complete.
, remove the call that was provided during Step
2. This task must be completed within 1 minute after the
call is provided during Step 2.
SYSTEM OPERATION
17
• The operation mode
• Blower CFM (if blower is running)
• Humidication/Dehumidication mode (if active)
• Ventilator operation (if active)
• any active fault codes
Menu items will appear in rotation as follows:
• Each item is ON for 2 seconds
• OFF for 1 second
• Then to the next item
This is an example for how to use the push buttons to make
a change to the constant fan speed.
1) When looking at the Furnace Control, the three 7
Segment displays (located just above the push buttons)
will be displaying system status. System status
includes the current modes of operation, airow and
any active error codes.
2) Press and release the Right Button (this will cycle
through the menus in one direction. Pressing the Left
Button would cycle through the menus in the opposite
direction. For this example, the right button will be
used).
3) The screen will now display Menu L6F (Last 6 Faults).
Continue pressing and releasing the Right Button
until you see FSd which is the menu for Constant Fan
Multiplier. Before reaching the FSd menu you will scroll
through Menus L6F, Lm, Cr, Sr and rFd.
4) Press and release the Center Button. The center button
is used to enter menus and make selections within
menus.
5) What will be displayed is the currently selected fan only
percentage. For this example the assumption is that
this currently selected fan only percentage is 25% and
changing this to 45% is the objective.
6) Press and Release the Right button. The screen will
change to 35 and start ashing. The ashing indicates
the displayed option has not been selected yet.
7) Press and Release the Right button again. The 7
segment displays will continue ashing but will now
display 45.
8) Press and Release the Center Button again. The 45
being displayed will stop ashing. To then complete
the selection process and make 45 the ocial fan only
setting Press and Release the Center Button for the
last time. This nal step will jump the user back to the
main menu list and FSd will be displayed again.
9) The constant fan multiplier has now been changed from
25 to 45
When the blower is running the CFM will be displayed in
Status Menu. The rst 7 segment character will display “A”.
The second & third characters will display the actual CFM
divided by 100. The actual CFM will display rounded up or
down to the nearest 100 CFM as follows;
SYSTEM OPERATION
18
If an active alarm is present, the alarm code shall be report-
ed in Status Menu starting with “E” and following with the
appropriate two digit alarm code.
While in the Last 6 Faults option menu, push & hold the
center button for 5 seconds. This will clear all non-active
alarm(s) in the Last 6 Faults menu. The display will ash
three times to conrm faults have been cleared.
Using this option resets the communicating network which
will cause the furnace to discover what devices are present
on ClimateTalk™ network. This menu will not appear when
the furnace control is connected to a Non-Comm OD unit.
This is a reference only menu to display the rmware
release revision numbers for each micro-controller.
This menu allows for adjustment of the multiplier for con-
stant fan operation in 10% increments. Each furnace has
a “Maximum CFM” determined by motor HP. All fan opera-
tions are based o of multipliers which are percentages of
this number. Max CFM is shown below. The default con-
stant fan multiplier is 25%.
Model Max CFM
3 Ton Models 1400
4 Ton Models 1760
5 Ton Models 2200
The menu is used to change the gas heat airow
multiplier for gas heat operation. In most cases the
default gas heat airow will provide a temperature rise
near the middle of the acceptable range. The multiplier
will be expressed by the 2nd & 3rd characters of the display
as a percentage of max CFM.
The default setting is 90 seconds. The available adjustment
range is from 30 to 180 seconds in 30 second increments.
The default setting is 30 seconds. The available adjustment
range is from 5 to 30 seconds in 5 second increments.
Gas Heat airow may be trimmed from -10% to +10% in
2% increments.
This menu allows adjustment of the low re CFM multiplier.
The default CFM for low re is 70% of high re.
This menu allows 100% ring rate be locked in to check
gas valve pressure.
T
O
PREVENT
UNRELIABLE
OPERATION
OR
EQUIPMENT
DAMAGE
,
THE
INLET
GAS
SUPPLY
PRESSURE
MUST
BE
AS
SPECIFIED
ON
THE
UNIT
RATING
PLATE
WITH
ALL
OTHER
HOUSEHOLD
GAS
FIRED
APPLIANCES
OPERATING
.
Natural Gas Minimum: 4.5" w.c. Maximum: 10.0" w.c.
Propane Gas Minimum: 11.0" w.c. Maximum: 13.0" w.c.
• 120 VAC power applied to furnace.
• Integrated ignition control performs internal checks.
• The control board will display I D L. awaiting a call from
the thermostat
• Integrated ignition control monitors safety circuit
continuously.
• Furnace awaits call from thermostat.
The normal operational sequence in heating mode is as
follows:
• R and W thermostat contacts close, initiating a call for
heat.
• Integrated control module performs safety circuit checks.
The control operates
the inducer in a manner to verify the pressure sensor
null value and span operation are within specication.
If the system is operating correctly, this test takes only
a few seconds. If the system is not functioning properly,
the control times out after a maximum 90 seconds and
display the proper fault code.
• Induced draft blower is energized for 30 second
prepurge.
• Igniter warm up begins after 30 second prepurge expires.
• Gas valves open at end of igniter warm up period,
delivering gas to burners and establishing ame.
• Integrated control module monitors ame presence. Gas
valve will remain open only if ame is detected.
• Circulator blower is energized on high heat speed
following a xed 30 second blower on delay. Electronic
air cleaner terminal is energized with circulator blower.
SYSTEM OPERATION
19
• Furnace operates; integrated control module monitors
safety circuits continuously.
• R and W thermostat contacts open, completing the call
for heat.
• Gas valve closes, extinguishing ame.
• Induced draft blower is de-energized following a thirty
second post purge.
• Circulator blower continues running for selected heat o
delay period factory set at 120 seconds. If required this
can be changed in the eld.
• Electronic air cleaner is de-energized.
• Furnace awaits the next call from thermostat.
The normal operational sequence in cooling mode is as
follows:
• R, Y and G thermostat contacts close, initiating a call
for cool.
• Integrated control module performs safety circuit checks.
• Outdoor fan and compressor are energized.
• Circulator blower is energized on cool speed following a
xed six second on delay. If required this can be changed
in the eld to 45 seconds. Electronic air cleaner terminal
is energized with circulator blower.
• Furnace circulator blower and outdoor cooling unit
run, integrated control module monitors safety circuits
continuously.
• R, Y and G thermostat contacts open, completing the
call for cool.
• Outdoor fan and compressor are de-energized.
• Circulator blower is de-energized following a xed forty
rve second cool o delay period. Electronic air cleaner
terminal is de-energized.
• Furnace awaits the next call from thermostat.
The normal operational sequence in Fan Only Mode is as
follows:
• R and G thermostat contacts close, initiating a call for
fan.
• Integrated control module performs safety circuit checks.
• Circulator blower is energized on low heat speed.
Electronic air cleaner terminal is energized.
• Circulator blower runs, integrated control module
monitors safety circuits continuously.
Combustion Quality
Combustion quality can be aected by several factors. Major
factors are venting and draining.
Venting
The venting system should be planned and installed with the
following in mind;
• Should not be longer than necessary
• Use 45°elbows rather than 90° elbows when possible
• Must not sag or otherwise trap condensate
• Use longest radius ttings possible
• If using 3” venting, make the transition from 2” to 3” as
close as practically possible
• Make sure there is no ue gas recirculation into the
combustion air pipe
Condensate Drainage
Furnace combustion can be aected if a furnace is holding
condensate. Check for proper connections of drain hoses,
make sure furnace condensate trap is clean. Make sure
furnace is not improperly sloped. Make sure air conditioning
coil drain is not interfering with furnace drain.
Other Causes
1. Manifold Gas Pressure must be set within the range stated
on the furnace rating plate.
2. Remove Draft Inducer, Check the integrity of the gasket
between the inducer and the collector box cover, any
air leak here will have a negative eect on combustion.
Check the orice hole in the collector box, it must be free
of burrs on both sides.
3. Make sure the eld installed gas line is not binding and
causing distortion of burner assembly
4. If the furnace is installed as a one pipe system; make
sure the surrounding area and structure are adequate
to provide combustion air
5. Make sure there are no cabinet air leaks allowing sup-
ply air to aect combustion
6. If heat exchanger integrity is uncertain, follow proce-
dures in Service Bulletin SF-041
The DCVK-20 and DCVK-30 kit is designed to allow the
terminations of a direct vent furnace to be “concentrically”
vented through a wall or roof. This kit allows a single
penetration to support terminations for both the vent/ue pipe
and the combustion air intake pipe.
1. Determine termination locations based on clearances
specied in furnace installation instructions, and following
steps as shown in Figures 1,3,6,7,8 and 9.
2. The vent termination must be located at least 12” above
ground or normally expected snow accumulation levels.
3. Do NOT terminate over public walkways. Avoid areas
where condensate may cause problems such as above
planters, patios, or adjacent to windows where steam
may cause fogging.
4. The vent termination shall be located at least 4’
horizontally from any electric meter, gas meter, regulator
and any relief equipment. These distances apply ONLY
to U.S. Installations.
SYSTEM OPERATION
20
5. The vent termination shall be located at least 3’ above
any forced air inlet located within 10’; and at least 10’
from a combustion air intake of another appliance, except
another direct vent furnace intake.
6. In Canada, the Canadian Fuel Gas Code takes
precedence over the preceding termination instructions.
3" or 4" Diameter
SDR-26 Pipe
2 or 2 1/2" Diameter
SDR-26 Pipe
2" or 3" Diameter
Y Concentric Fitting
2" or 3" Diameter
Rain Cap
These kits are for vertical or horizontal termination of the
combustion air inlet and the exhaust vent pipes on Category
IV gas-red condensing furnaces. The DCVK-30 kit can be
used for 3” diameter pipe systems. The DCVK-20 kit can be
used for the 2” diameter pipe system. For the correct pipe size
for the furnace. Both the combustion air inlet and the exhaust
vent pipes must attach to the termination kit. The termination
kit must terminate outside the structure and must be installed
per the instructions outlined below for vertical or horizontal
termination. Vertical termination is preferred. Field supplied
pipe and ttings are required to complete the installation.
This manual suits for next models
5
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