Daikin DP14U Series User manual
DP14U & DP16U M SERIES
With R-410A
Single Package Gas-Electric Ultra-Low NOx Heating & Cooling Unit
Users Information Manual adjacent to the unit.
Only personnel that have been trained to install, adjust, service
manual should service the equipment. The manufacturer will not
be responsible for any injury or property damage arising from
improper service or service procedures. If you service this unit,
you assume responsibility for any injury or property damage
which may result. In addition, in jurisdictions that require one or
only licensed personnel should service the equipment.
Improper installation, adjustment, servicing or repair of the
without proper training may result in product damage, property
damage, personal injury or death.
WARNING
ATTENTION INSTALLING PERSONNEL:
Prior to installation, thoroughly familiarize yourself with this
Installation Manual. Observe all safety warnings. During
installation or repair, caution is to be observed.
It is your responsibility to install the product safely and to educate
the customer on its safe use.
RECOGNIZE THIS SYMBOL
AS A SAFETY PRECAUTION.
These installation instructions cover the outdoor installation of
self contained package air conditioners and heating units. See
regarding accessories.
*NOTE: Please contact your distributor or our website for the
This Forced Air Central Unit Design Complies With Requirements
Embodied In The American National Standard / National Standard
of Canada Shown Below.
ANSI Z21.47•CSA-2.3 Central Furnaces.
INSTALLATION INSTRUCTIONS
IOD-3021B
06/2021
Our continuing commitment to quality products may mean a change in specications without notice.
©2020-2021
19001 Kermier Rd., Waller, TX 77484
www.daikincomfort.com
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REPLACEMENT PARTS ......................................................... 3
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SAFETY INSTRUCTIONS ....................................................... 3
GENERAL INFORMATION...................................................... 5
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UNIT LOCATION ...................................................................... 7
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GAS PIPING ............................................................................. 8
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ELECTRICAL WIRING ............................................................ 10
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VENTING................................................................................... 12
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NORMAL SEQUENCES OF OPERATION............................. 12
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MAINTENANCE........................................................................ 19
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3
REPLACEMENT PARTS
When reporting shortages or damages, or ordering repair parts,
give the complete unit model and serial numbers as stamped on
the unit’s nameplate.
Replacement parts for this appliance are available through your
contractor or local distributor. For the location of you nearest
distributor, see website www.daikinac.com or contact:
EQUIPMENT SUPPORT
DAIKIN NORTH AMERICA LLC
19001 KERMIER ROAD
WALLER, TEXAS 77484
855-770-5678
SAFETY INSTRUCTIONS
Before installing this unit, please read this manual to familiarize
yourself on the specic items which must be adhered to, including
maximum external static pressure to unit, air temperature rise,
minimum or maximum CFM and motor speed connections.
Keep this literature in a safe place for future reference.
This unit is designed to meet the NOX
requirement of 14Ng/J maximum as required by the South Coast
Air Quality Management District and the San Joaquin Valley Air
Pollution Control District, both in the State of California, and is
intended for installation in those districts only.
This unit has a Control System that compensates for certain
installation and environmental conditions. This unit must:
• Be properly installed, operated, and maintained per the
instructions.
• Be serviced only by properly trained Service Technicians.
This unit is not approved for use with gases other than Natural
Gas.
Units that are not installed, maintained, or operated properly may
result in “noisy” operation during the Heating Cycle. If this unit is
making unusual or objectionable noises during the Heating Cycle,
turn the heat o at the thermostat and contact a qualied Service
organization right away.
Adhere to the following warnings and cautions when installing,
adjusting, altering, servicing, or operating the furnace. To ensure
proper installation and operation, thoroughly read this manual
for specics pertaining to the installation and application of this
product.
This furnace is manufactured for use with natural gas only.
Never test for gas leaks with an open ame. Use commercially
available soap solution made specically for the detection of
leaks to check all connections, as specied in GAS PIPING
section of this manual.
Always install a furnace to operate within the furnace’s intended
temperature-rise range with a duct system which has external
static pressure within the allowable range, as specied on the
rating plate.
WARNING
•
•
•
WARNING
WARNING
4
WARNING
AVERTISSEMENT
WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result
in serious injury, death or property damage.
Never test for gas leaks with an open flame.
Use a commercially available soap solution made
specifically for the detection of leaks to check all
connections. A fire or explosion may result causing
property damage, personal injury or loss of life.
RISQUE D'INCENDIE OU D'EXPLOSION
Si les consignes de sécurité ne sont pas suivies à la lettre,
cela peut entraîner la mort, de graves blessures ou des
dommages matériels.
Ne jamais vérifier la présence de fuites de gaz au moyen
d'une flamme nue. Vérifier tous les raccords en utilisant
une solution savonneuse commerciale conçue
spécialement pour la détection de fuites. Un incendie ou
une explosion risque de se produire, ce qui peut entraîner
la mort, des blessures ou des dommages matériels.
WARNING
WARNING
WARNING
WARNING
5
Carbon monoxide producing devices (such as an automobile, space
heater, gas water heater, etc.) should not be operated in enclosed areas
such as unvenlated garages, ulity rooms or parking areas because of
the danger of carbon monoxide (CO) poisoning resulng from the exhaust
emissions. If a furnace or air handler is installed in an enclosed area such
as a garage, ulity room or parking area and a carbon monoxide producing
device is operated therein, there must be adequate, direct outside
venlaon.
CARBON MONOXIDE POISONING HAZARD
Special Warning for Installaon of Furnace or Air Handling Units in
Enclosed Areas such as Garages, Ulity Rooms or Parking Areas
This venlaon is necessary to avoid the danger of CO poisoning which
can occur if a carbon monoxide producing device connues to operate in
the enclosed area. Carbon monoxide emissions can be (re)circulated
throughout the structure if the furnace or air handler is operang in any
mode.
B10259-216
CO can cause serious illness including permanent brain
damage or death.
Los equipos ó aparatos que producen monóxido
(tal como automóvil, calentador de gas, calentador de
carbono (CO) que resulta de las
emisiones de gases de combusón.
gas, etc) no deben ser operados en áreas cerradas debido al riesgo
de envenenamiento por monóxido de
Si el equipo ó aparato se opera en
dichas áreas, debe exisr una adecuada venlación directa al exterior.
de carbono
agua por medio de
Advertencia especial para la instalación de calentadores ómanejadoras
de aire en áreas cerradas como estacionamientos ó cuartos de servicio.
B10259-216
RIESGO DE INTOXICACIÓN PORMONÓXIDODE CARBONO
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.
Averssement special au sujet de l'installaon d'appareils de chauffage
ou de traitement d'air dans des endroits clos, tets les garages, les
locaux d'entreen et les staonnements.
B10259-216
RISQUE D'EMPOISONNEMENT AUMONOXYDE DE CARBONE
Evitez de mere en marche les appareils produisant du monoxyde
de carbone (tels que les automobile, les appareils de chauffage
autonome,etc.) dans des endroits non venlés tels que les
d'empoisonnement au monoxyde de carbone. Si vous devez faire
fonconner ces appareils dans un endroit clos, assures-vous
qu'il y ait une venlaon directe provenant de l'exterier.
Le monoxyde de
des
carbone peut causer des maladies graves telles que
dommages permanents au cerveau et meme la mort.
Les émissions de monoxyde de carbone peuvent etre recircules dans les
endroits clos, si l'appareil de chauffage ou de traitement d'air sont
en marche.
Cee venlaon est nécessaire pour éviter le danger d'intoxicaon
au CO pouvant surven ir si un appareil produisant du monoxyde
de carbone connue de fonconner au sein de la zone confinée.
Esta venlaciónes necesaria para evitar el peligro de envenenamiento
por CO, que puede ocurrir si un monóxido
de carbono sigue operando en el lugar cerrado .
disposivo que produce
General Information
WARNING
To prevent property damage, personal injury or death, due to re,
explosions, smoke, soot, condensation, electric shock or carbon
monoxide, this unit must be properly installed repaired, operated, and
maintained.
This unit is approved for outdoor installation ONLY. Rated
performance is achieved after 20 hours of operation. Rated
performance is delivered at the specied airow. See outdoor unit
specication sheet for split system models or product specication
sheet for packaged and light commercial models. Specication
sheets can be found at www.daikincomfort.com for Daikin® brand
products. Within the website, please select the residential or
commercial products menu and then select the submenu for the
type of product to be installed, such as air conditioners or heat
pumps, to access a list of product pages that each contain links to
that model’s specication sheet.
To assure that your unit operates safely and eciently, it must
be installed, operated, and maintained in accordance with these
installation and operating instructions, all local building codes
and ordinances, or in their absence, with the latest edition of the
National Fuel Gas Code NFPA 54/ANSI Z223.1 and National
Standard of Canada CAN/CSA B149 Installation Codes.
The heating and cooling capacities of the unit should be greater
than or equal to the design heating and cooling loads of the area
to be conditioned. The loads should be calculated by an approved
method or in accordance with A.S.H.R.A.E. Guide or Manual J -
Load Calculations published by the Air Conditioning Contractors
of America.
Obtain from:
American National Standards Institute
25 West 43rd Street, 4th Floor
New York, NY 10036
Check the carton upon arrival for external damage. If damage is
found, a request for inspection by carrier agent should be made in
writing immediately.
Carefully inspect the unit for damage including damage to the
cabinetry. Any bolts or screws which may have loosened in transit
must be re-tightened. In the event of damage, the receiver should:
1. Make notation on delivery receipt of any visible damage to
shipment or container.
2. Notify carrier promptly and request an inspection.
3. In case of concealed damage, carrier should be notied as
soon as possible-preferably within 5 days.
4. File the claim with the following supporting documents:
a. Original Bill of Lading, certied copy, or indemnity bond.
b. Original paid freight bill or indemnity in lieu thereof.
c. Original invoice or certied copy thereof, showing trade and
other discounts or reductions.
d. Copy of the inspection report issued by carrier
representative at the time damage is reported to the carrier.
The carrier is responsible for making prompt inspection of
damage and for a thorough investigation of each claim.
The distributor or manufacturer will not accept claims from
dealers for transportation damage.
When inspecting the unit for transportation damage,
remove all packaging materials. Recycle or dispose of the
packaging material according to local codes.
6
WARNING
AVERTISSEMENT
7
UNIT LOCATION
WARNING
Remove wood shipping rails prior to
installation of the unit.
• For proper ame pattern within the heat exchanger and
proper condensate drainage, the unit must be mounted level.
• The ue outlet hood must be at least 12 inches from any
opening through which ue gases could enter a building,and
at least three feet above any forced air inlet located within ten
feet. The economizer/manual fresh air intake/motorized fresh
air intake and combustion air inlet mounted on the unit are
not aected by this restriction.
• To avoid possible corrosion of the heat exchanger, do
not locate the unit in an area where the outdoor air (i.e.
combustion air for the unit) will be frequently contaminated by
compounds containing chlorine or uorine. Common sources
of such compounds include swimming pool chemicals
and chlorine bleaches, paint stripper, adhesives, paints,
varnishes, sealers, waxes(which are not yet dried) and
solvents used during construction and remodeling. Various
commercial and industrial processes may also be sources of
chlorine/ uorine compounds.
• To avoid possible illness or death of the building occupants,
do NOT locate outside air intake device (economizer, manual
fresh air intake, motorized fresh air intake) too close to an
exhaust outlet, gas vent termination, or plumbing vent outlet.
For specic distances required, consult local codes.
• Allow minimum clearances from the enclosure for re
protection, proper operation, and service access (see
appendix). These clearances must be permanently
maintained.
• The combustion air inlet and ue outlet hoods on the
unit must never be obstructed. If used, do not allow the
economizer/manual fresh air damper/ motorized fresh air
damper to become blocked by snow or debris. In some
climates or locations, it may be necessary to elevate the unit
to avoid these problems.
• Damper must be in open position when appliance main
burner(s) is operating.
Le registre doit être ouvert lorsque tout brûleur principal de
l’appareil est en état de fonctionnement.
• When the unit is heating, the temperature of the return air
entering the unit must be between 50° F and 100° F.
• Units manufactured on or after May 1, 2017 are not permitted
to be used in Canada for heating of buildings or structures
under construction.
When the unit is installed on the ground adjacent to the building,
a level concrete (or equal) base is recommended. Prepare a base
that is 3” larger than the package unit footprint and a minimum of
3” thick.
• The base should also be located where no runo of water
from higher ground can collect in the unit.
• The top of the unit should be completely unobstructed. If
units are to be located under an overhang, there should be a
minimum of 48” clearance and provisions made to deect the
warm discharge air out from the overhang.
Outside Slab Installation
To ensure proper condensate drainage, unit must be
installed in a level position.
• To avoid possible property damage or personal injury, the roof
must have sucient structural strength to carry the weight
of the unit(s) and snow or water loads as required by local
codes. Consult a structural engineer to determine the weight
capabilities of the roof.
Rooftop Installation
8
• The unit may be installed directly on wood oors or on Class
A, Class B, or Class C roof covering material.
• To avoid possible personal injury, a safe, at surface for
service personnel should be provided.
• Sucient structural support must be determined prior to
locating and mounting the curb and package unit.
• Ductwork must be constructed using industry guidelines. The
duct work must be placed into the roof curb before mounting
the package unit.
• Curb insulation, cant strips, ashing and general roong
material are furnished by the contractor.
Roof Curb Installation
WARNING
If using bottom discharge with roof curb,
ductwork should be attached to the curb prior to installing the
unit. Ductwork dimensions are shown in roof curb installation
instructions.
Refer to the Roof Curb Installation Instructions for proper curb
installation. Curbing must be installed in compliance with the
National Roong Contractors Association Manual.
Lower unit carefully onto roof mounting curb. While rigging unit,
center of gravity will cause condenser end to be lower than supply
air end.
Rigging
GAS PIPING
This unit is factory set to operate on natural
gas at the altitudes shown on the rating plate.
The rating plate is stamped with the model number, type of gas
and gas input rating. Make sure the unit is equipped to operate on
the type of gas available.
Natural Min. 5.0" W.C., Max. 10.0" W.C.
INLET GAS PRESSURE
Inlet gas pressure must be within the minimum and the maximum
value shown in the inlet gas pressure table.
The minimum supply pressure should not vary from that shown
in the table because this could prevent the unit from having
dependable ignition. In addition, gas input to the burners must not
exceed the rated input shown on the rating plate. Overring of the
unit could result in premature heat exchanger failure.
CAUTION
WARNING
9
The rating plate is stamped with the model number, type of gas
and gas input rating. Make sure the unit is equipped to operate on
the type of gas available. The gas line installation must comply
with local codes, or in the absence of local codes, with the latest
edition of the National Fuel Gas Code NFPA 54/ANSI Z223.1.
Natural Gas Connection
1/2 3/4 11 1/4 1 1 /2
10 132 278 520 1050 1600
20 92 190 350 730 1100
30 73 152 285 590 980
40 63 130 245 500 760
50 56 115 215 440 670
60 50 105 195 400 610
70 46 96 180 370 560
80 43 90 170 350 530
90 40 84 160 320 490
100 38 79 150 305 460
Pressure= .50 PSIG or less and Pressure Drop of 0.3" W.C.
(Based on 0.60 Specific Gravity Gas)
Natural Gas Capacity of Pipe
in Cubic Feet of Gas Per Hour (CFH)
Nominal Black Pipe Size (inches)
Length of
Pipe in Feet
Heating Value of Gas (BTU/Cubic Foot
CFH =
BTUH Furnace Input
1. Refer to the Proper Piping Practice drawing for the general
layout at the unit. The following rules apply:
2. Use black iron pipe and ttings for the supply piping. The
use of a ex connector and/or copper piping is permitted as
long as it is in agreement with local codes.
3. Use pipe joint compound on male threads only. Pipe joint
compound must be resistant to the action of the fuel used.
4. Use ground joint unions.
5. Install a drip leg to trap dirt and moisture before it can enter
the gas valve. The drip leg must be a minimum of three
inches long.
6. Use two pipe wrenches when making connection to the gas
valve to keep it from turning.
7. Install a manual shut-o valve in a convenient location
(within six feet of unit) between the meter and the unit.
8. Tighten all joints securely.
9. The unit must be connected to the building piping by one of
the following methods:
• Rigid metallic pipe and ttings
• Semirigid metallic tubing and metallic ttings (Aluminum
alloy tubing must not be used in exterior locations)
• Listed gas appliance connectors used in accordance with
the terms of their listing that are completely in the same
room as the equipment
• In the prior two methods above the connector or tubing
must be protected from physical and thermal damage.
Aluminum alloy tubing and connectors must be coated to
protect against external corrosion when in contact with
masonry, plaster or insulation or are subject to repeated
wettings by liquids (water - not rain water, detergents or
sewage)
Proper Piping Practice
The unit gas supply entrance is factory sealed with plugs.
Keep plugs in place until gas supply is ready to be installed. Once
ready, replace the plugs with the supplied grommets and install
gas supply line.
WARNING
•
•
•
WARNING
There will be air in the gas supply line after testing for leaks on a
new installation. Therefore, the air must be bled from the line by
loosening the ground joint union until pure gas is expelled. Tighten
union and wait for ve minutes until all gas has been dissipated in
the air. Be certain there is no open ame in the vicinity during air
bleeding procedure. The unit is placed in operation by closing the
main electrical disconnect switch for the unit.
10
Electrical Wiring
Mount the thermostat approximately ve feet above the oor, in
an area that has an inside, vibration-free wall and has good air
circulation.
Movement of air must not be obstructed by furniture, door,
draperies, etc. The thermostat must not be mounted where it will
be aected by drafts, hot or cold water pipes or air ducts in walls,
radiant heat from replace, lamps, the sun, television, etc. Consult
the Instruction Sheet packaged with thermostat for mounting
instructions.
All units have one stage of heating and either one or
two stages of mechanical cooling. If the unit has two stages of
mechanical cooling, the thermostat must also be two stage. Refer
to gures later in this section for wiring.
WARNING
The units are designed for operation on 60 hertz current and at
voltages as shown on the rating plate. All internal wiring in the
unit is complete. It is necessary to bring in the power supply to the
contactor as shown on the unit wiring diagram which is supplied
with each unit. The low voltage wiring must be connected between
the unit control panel and the room thermostat.
R C G W Y
THERMOSTAT
RD BL GR WH YL YL
1 STAGE COOLING - 1 PHASE POWER
R C G W Y
THERMOSTAT
RD BL GR WH YL YL PU
1 STAGE COOLING - 3 PHASE POWER
NO ECONOMIZER
R C G
RD BL GR WH
W1 W2 Y1 Y2
YL YL
PUPU
THERMOSTAT
2 STAGE COOLING - 1 PHASE POWER
R C G
RD BL WH
W1 W2 Y1 Y2
YL YL
PUPU
THERMOSTAT
YL
GR GR
2 STAGE COOLING - 3 PHASE POWE
R
WIRING LEGEND
FACTORY WIRING
FIELD WIRING
WIRE NUT CONNECTIO
N
RD BL WH YL PU
1 STAGE COOLING - 3 PHASE POWER
WITH ECONOMIZER
R C G W1 W2 Y1 Y2
THERMOSTAT
GR GR YL
1 2
1 WIRE CONNECTS TO PCBBL216 J5 PLM PIN 5
2 WIRE CONNECTS TO ECONOMIZER PLF PIN 2
The optional usage of a dehumidistat allows the unit’s circulator
blower to operate at a slightly lower speed (approximately 80%
of desired cooling speed) during a combined thermostat call for
cooling and dehumidistat call for dehumidication. This can be
done through an independent dehumidistat. This lower blower
speed enhances dehumidication of the conditioned air as it
passes through the air conditioning coil. For proper function, a
dehumidistat applied to this package unit must operate on 24 VAC
and utilize a switch which opens on humidity rise. Refer to the unit
wiring diagram for additional wiring details.
To install/connect a dehumidistat:
1. Turn OFF power to unit.
WARNING
2. To enable the dehumidify function, locate the ECM blower
motor interface module in the unit’s blower section. Locate
the jumper labeled “HUM” on the interface module. Cut the
jumper to enable dehumidication (see ECM Blower Motor
Interface Module).
3. Connect “R” to the common side of the Dehumidistat (close
on humidity rise).
4. Connect the N/O (normally open) side of the Dehumidistat to
the HUM terminal on PCBEM103 ECM control board.
5. Turn ON power to unit.
Once the HUM jumper is cut at the ECM motor interface module,
the dehumidify function is enabled during a combination call for
cooling (T-Stat) and dehumidication (DEHUMStat).
5
Y1
1
SW ITCH
87654321
W1
OT1
OT2
HUM
PJ6
PJ2
PJ4
W2
CR9
HEATER
W1 W2 C R
24 VAC
CR8
CR7
CR6
J3
CR5
C2
4
1J2
CR2
DS1
CR1
R5
OFF
ON
DIP
E
F1 3 AMP
KESU
CR10
R3
PN . PC B001 0 2
(CFM)
CONFIGURATION.
DIP SWITCH
FOR PROPER
TO MANUAL
PLEASE REFER
R1
R2
EDW2OCOMYCONR
HEATPUMP
CONDENSER
OUTDOOR
THERMOSTATS HUMIDISTAT
HUMY/Y2GY1RCOT2OT1OTCOW/W2E\W1
J1
HUM
PJ6
11
Refer to the unit wiring diagram for electrical connections. When
installed, the unit must be electrically grounded in accordance with
local codes or in the absence of local codes, with the National
Electrical Code, ANSI/NFPA No. 70, and/or the CSA C22.1
Electrical Code. Ensure low voltage connections are waterproof.
For unit protection, use a fuse or hacr circuit breaker that is
in excess of the circuit ampacity, but less than or equal to the
maximum overcurrent protection device. DO NOT EXCEED THE
MAXIMUM OVERCURRENT DEVICE SIZE SHOWN ON UNIT
DATA PLATE.
All line voltage connections must be made through weatherproof
ttings. All exterior power supply and ground wiring must be in
approved weatherproof conduit. Low voltage wiring from the unit
control panel to the thermostat requires coded cable. See below
for ground level and rooftop wiring.
Rated
Voltage
Minimum Supply
Voltage
Maximum Supply
Voltage
208/230V 197 253
The unit transformer is factory connected for 230V operation. If
the unit is to operate on 208V, reconnect the transformer primary
lead as shown on the unit wiring diagram. The induced draft
blower on some models is equipped with a low speed 230V lead
(blue) and a low speed 208V lead (black). If equipped, connect
the induced draft blower low speed 208V lead (black) in place of
the low speed 230V lead (blue). Place the unused 230V lead on
the “PARK” terminal located on ignition control.
Single Phase Units. Connect two leads to terminals L1 & L2 in the
electrical control section,
Three Phase Units. Connect three leads to terminals L1, L2 &
L3 in the electrical control section, using wire sizes specied in
“Wiring table”.
BRANCH CIRCUIT
AMPACITY
15 20 25 30 35 40 45 50
SUPPLY WIRE
LENGTH - FEET
200 6 4 4 4 3 3 2 2
150 8 6 6 4 4 4 3 3
100 10 8 8 6 6 6 4 4
50 14 12 10 10 8 8 6 6
Circulating Air and Filters
Units can easily be converted from horizontal to down-discharge
airow delivery. In down-discharge or high static installations, the
installer should measure the total external static and review the
blower performance charts before performing the installation. In
some installations it will be necessary to change the blower speed
to provide proper air ow.
Single phase models are shipped without horizontal duct covers. If
needed, these kits may be ordered through Daikin’s Service Parts
department.
Cut insulation around bottom openings and remove panels from
the bottom of the unit, saving the screws holding the panels in
place.
Single phase models require installation of horizontal duct
kit #20464501NGK (medium chassis) and #20464502NGK (large
chassis). See “Unit Dimensions”section for chassis sizes.
Duct systems and register sizes must be properly designed for the
C.F.M. and external static pressure rating of the unit. Ductwork
should be designed in accordance with the recommended
methods of Air Conditioning Contractors of America Manual D
(Residential) or Manual Q (Commercial). All ductwork exposed to
the outdoors must include a weatherproof barrier and adequate
insulation.
A duct system should be installed in accordance with Standards
of the National Board of Fire Underwriters for the Installation of
Air Conditioning, Warm Air Heating and Ventilating Systems.
Pamphlets No. 90A and 90B.
The supply duct from the unit through a wall may be installed
without clearance. However, minimum unit clearances as shown
in the appendix must be maintained. The supply duct should be
provided with an access panel large enough to inspect the air
chamber downstream of the heat exchanger. A cover should be
tightly attached to prevent air leaks.
For duct ange dimensions on the unit refer to the Unit Dimension
illustration in the appendix.
12
For down-discharge applications, the ductwork should be attached
to the roof curb prior to installing the unit. Ductwork dimensions
are shown in the roof curb installation manual.
If desired, supply and return duct connections to the unit may be
made with exible connections to reduce possible unit operating
sound transmission.
Even though a return air lter is not supplied with this unit, there
must be a means of ltering all return air. All units may be
externally ltered.
Refer to the unit lter size chart in the appendix for lter size
information.
Filters installed external to the unit should be sized in accordance
with their manufacturer recommendations. A throwaway lter must
be sized for a maximum face velocity of 300 feet per minute.
Filter Installation
I When installing a lter, the air ow arrows on
the lter must point toward the circulator blower.
Venting
Venting is self-contained. Do not modify or block.
1. Locate the ue hood assembly box in the unit.
2. Slide screen over anges on the lower ue hood.
3. Slide screen and lower ue hood into hood.
4. Using the three screws provided, attach the hood (with the
opening facing down) over the ue exhaust opening in the
utility panel.
SCREEN
HOOD
LOWER
FLUE
HOOD
LIP
1. Locate the second hood.
2. Using the three screws provided, attach the hood (with the
opening facing down) to the heat exchanger access door.
A 3/4” NPT drain connection is supplied for condensate piping. An
external trap must be installed for proper condensate drainage.
DRAIN
CONNECTION
UNIT 2" MINIMUM
FLEXIBLE
TUBING-HOSE
OR PIPE
3" MINIMUM
A POSITIVE LIQUID
SEAL IS REQUIRED
Normal Sequences Of Operation
This unit is equipped with an ignition control that automatically
lights the main burner. DO NOT attempt to light the main burners
by any other method.
1. R and W thermostat contacts close, initiating a call for heat.
2. Integrated control module performs safety circuit checks.
3. Inducer draft blower is energized for 30 second pre-purge
period causing pressure sensor contacts to close.
4. At the end of pre-purge period, integrated control module
transitions the induced draft blower to light-o setting.
5. Once the light-o pressure setting is veried by the
integrated control module, the spark igniter and gas valve
are energized for 4 seconds.
The igniter produces a very intense electrical spark that
ignites the gas.
6. Integrated control module monitors ame presence. Gas
valve will remain open only if the ame is detected.
7. The 5-second HEAT FAN ON delay time begins after main
burner lights.
13
8. The unit delivers heat to the conditioned space until the
thermostat is satised; integrated control module monitors
safety circuits continuously.
9. R and W thermostat contacts open, completing the call for
heat; gas valve de-energizes.
10. Induced draft blower keeps operating for 30-second post
purge.
11. Ignition control begins timing the HEAT FAN OFF
delay. There is an adjustable HEAT FAN OFF delay of
approximately 90/120/150/180 seconds (factory set at 150).
This delay allows any additional heat in the heat
exchanger to be transferred to the conditioned space. After the
HEAT FAN OFF delay time has elapsed, the blower will de-
energize.
1. Thermostat calls for low or high stage cooling.
2. If the thermostat call is for low stage cooling, the compressor
and outdoor fan are energized at low stage. If the thermostat
call is for high stage cooling, the compressor and outdoor
fan are energized at high stage.
3. The indoor blower will energize approximately 6 seconds
later.
4. The unit delivers cooling to the conditioned space until the
thermostat is satised.
5. The compressor and outdoor fan will be de-energized when
the thermostat opens.
6. The indoor blower continues to run at low cool speed for
approximately 60 seconds after the thermostat is satised.
This allows additional cooling from the indoor coil to be
transferred to the conditioned space. Then, the indoor
blower is de-energized.
NOTE: A 180-second anti-short cycle is integral to the control and
prevents recycling of the compressor.
1. Thermostat calls for FAN ONLY by energizing “G”.
2. Indoor blower is energized at fan only speed. DP16U
models are equipped with ECM variable speed motor; the
fan only blower speed is approximately 75% of the HIGH
COOL speed for DP16U models.
3. The indoor blower is immediately de-energized once
thermostat call for FAN is removed.
Startup, Adjustments, and Checks
This unit is equipped with an electronic ignition device to
automatically light the main burners. It also has a power vent
blower to exhaust combustion products.
On new installations, or if a major component has been replaced,
the operation of the unit must be checked.
Check unit operation as outlined in the following instructions. If
any sparking, odors, or unusual sounds are encountered, shut
o electrical power and check for wiring errors, or obstructions in
or near the blower motors. Duct covers must be removed before
operating unit.
The burner temperature switch is mounted on the burner
assembly to monitor the burner box temperature. It is normally
closed (electrically), auto-reset sensor. An input to the control is
provided by the normally closed blocked burner switch. An open
blocked burner switch interrupts current to the gas valve which
closes the valve. This switch guards against the burner ames not
being properly drawn into the heat exchanger.
Secondary Limit Control
The secondary limit control is located on the top of the blower
scroll assembly. This control opens when elevated temperatures
are sensed. Elevated temperatures at the control are normally
caused by blower failure. The reason for the opening should be
determined and repaired prior to resetting.
If the power to the unit is interrupted during the heating cycle,
it may cause the secondary limit to trip. Once the blower
compartment temperature drops below the limit reset temperature,
the limit will automatically reset.
Secondary
Control Limit
Back of Unit
Secondary Limit Control
1. Close the manual gas valve external to the unit.
2. Turn o the electrical power supply to the unit.
3. Set the room thermostat to its lowest possible setting.
4. Remove the heat exchanger door on the side of the unit by
removing screws.
5. This unit is equipped with an ignition device which
automatically lights the main burner. DO NOT try to light
burner by any other method.
6. Move the gas control valve switch to the OFF position. Do
not force.
7. Wait ve minutes to clear out any gas.
14
8. Smell for gas, including near the ground. This is important
because some types of gas are heavier than air. If you have
waited ve minutes and you do smell gas, immediately
follow the warnings near the beginning of this manual. If
having waited for ve minutes and no gas smell is noted,
move the gas control valve switch to the ON position.
9. Replace the heat exchanger door on the side of the unit.
10. Open the manual gas valve external to the unit.
11. Turn on the electrical power supply to the unit.
12. Set the thermostat to desired setting.
Gas Supply And Manifold Check
Gas supply pressure and manifold pressure with the burners
operating must be as specied on the rating plate.
Use adapter kit #0151K00000S to measure gas pressure
on White-Rodgers 36J22Y gas valves.
CAUTION
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
.
The line pressure supplied to the gas valve must be within
the Inlet Gas Supply Pressure range specied. The supply
pressure can be measured at the gas valve inlet pressure
tap or at a hose tting installed in the gas piping drip leg.
The supply pressure must be measured with the unit OFF.
To measure inlet pressure, use the following procedure.
1. Turn OFF gas to furnace at the manual gas shuto valve
external to the furnace.
2. Turn OFF all electrical power to the system.
3. Inlet pressure tap connections:
a. White-Rodgers valve:
Back inlet pressure test screw (inlet pressure tap out one
turn (counterclockwise, not more than one turn).
4. Connect manometer (or appropriate pressure gauge) at
either the gas valve inlet pressure tap or the gas piping drip
leg. See White-Rodgers 36J22Y-204 gas valve for location
of inlet pressure tap.
5. Turn ON the gas supply.
6. Turn On power and operate the furnace and all other gas
consuming appliances on the same gas supply line.
7. Using a leak detection solution or soap suds, check for
leaks at screw (White-Rodgers valve). Bubbles forming
indicate a leak. SHUT OFF GAS AND REPAIR ALL LEAKS
IMMEDIATELY!
8. Measure the gas supply pressure with burners ring. Adjust
supply pressure using the Inlet Gas Supply Pressure table
shown below. If supply pressure reading diers from the
table, make necessary adjustments to pressure regulator,
gas piping size, etc., and/or consult with local gas utility.
Natural Gas Min. 5.0" W.C., Max. 10.0" W.C.
INLET GAS SUPPLY PRESSURE
9. Turn OFF all electrical power and gas supply to the system.
10. Remove the manometer hose from the hose barb tting or
inlet pressure Tap.
11. Replace inlet pressure tap:
a. White-Rodgers valve:
Turn inlet pressure test screw in to seal pressure port
(clockwise, 7 in-lb minimum).
12. Retest for leaks. If bubbles form, shut down gas and repair
leaks immediately.
13. If there are no leaks, turn ON electrical power and gas
supply to the system.
14. Turn valve switch ON.
If measuring gas pressure at the drip leg, a eld-supplied
hose barb tting must be installed prior to making the hose
connection. If using the inlet pressure Tap on the White-Rodgers
gas valve, then use the 36G/J Valve Pressure Check Kit,
Goodman Part No. 0151K00000S.
T
O
PREVENT
UNRELIABLE
OPERATION
OR
EQUIPMENT
DAMAGE
,
THE
GAS
MANIFOLD
PRESSURE
MUST
BE
AS
SPECIFIED
ON
THE
UNIT
RATING
PLATE
. O
NLY
MINOR
ADJUSTMENTS
SHOULD
BE
MADE
BY
ADJUSTING
THE
GAS
VALVE
PRESSURE
REGULATOR
.
CAUTION
Only small variations in gas pressure should be made by adjusting
the gas valve pressure regulator. The manifold pressure must be
15
measured with the burners operating. To measure and adjust the
manifold pressure, use the following procedure.
1. Turn OFF gas to furnace at the manual gas shuto valve
external to the furnace.
2. Turn OFF all electrical power to the system.
3. Outlet pressure tap connections:
a. White-Rodgers valve:
Back outlet pressure test screw (outlet pressure Tap) out
one turn (counterclockwise, not more than one turn).
4. Connect manometer (or appropriate pressure gauge) at the
gas valve outlet pressure tap. See White-Rodgers 36J22Y-
204 gas valve for location of outlet pressure tap.
5. Turn ON the gas supply.
6. Turn ON power and close thermostat “R” and “W” contacts
to provide a call for heat.
7. Using a leak detection solution or soap suds, check for
leaks at outlet pressure Tap screw (White-Rodgers valve).
Bubbles forming indicate a leak. SHUT OFF GAS AND
REPAIR ALL LEAKS IMMEDIATELY!
8. Measure the gas manifold pressure with burners ring.
Adjust manifold pressure using the following Manifold Gas
Pressure table.
Natural Gas 2.8" - 3.2" w.c.
Manifold Gas Pressure
The Manifold Gas Pressure must be within the range specied.
9. Remove regulator cover screw from the outlet pressure
regulator and turn screw clockwise to increase pressure or
counterclockwise to decrease pressure. Replace regulator
cover screw.
10. Turn OFF all electrical power and gas supply to the system.
11. Remove the manometer hose from the hose barb tting or
outlet pressure Tap.
12. Replace outlet pressure tap:
a. White-Rodgers valve: Turn outlet pressure test screw in
to seal pressure port (clockwise, 7 in-lb minimum).
13. Turn ON electrical power and gas supply to the system.
14. Close thermostat contacts to provide a call for heat.
15. Retest for leaks. If bubbles form, SHUT OFF GAS AND
REPAIR ALL LEAKS IMMEDIATELY!
To measure the gas input use a gas meter and proceed as
follows:
1. Turn o gas supply to all other appliances except the unit.
2. With the unit operating, time the smallest dial on the meter
for one complete revolution. If this is a 2 cubic foot dial,
divide the seconds by 2; if it is a 1 cubic foot dial, use the
seconds as is. This gives the seconds per cubic foot of gas
being delivered to the unit.
3. INPUT=GAS HTG VALUE x 3600 / SEC. PER CUBIC FOOT
Example: Natural gas with a heating value of 1000 BTU per
cubic foot and 36 seconds per cubic foot as determined by
Step 2, then:
Input = 1000 x 3600 / 36 = 100,000 BTU per Hour.
BTU content of the gas should be obtained from the
gas supplier. This measured input must not be greater than
shown on the unit rating plate.
4. Relight all other appliances turned o in step 1. Be sure all
pilot burners are operating.
Temperature Rise Check
Check the temperature rise through the unit by placing
thermometers in supply and return air registers as close to the
unit as possible. Thermometers must not be able to sample
temperature directly from the unit heat exchangers, or false
readings could be obtained.
1. All registers must be open; all duct dampers must be in their
nal (fully or partially open) position and the unit operated
for 15 minutes before taking readings.
2. The temperature rise must be within the range specied on
the rating plate.
Air temperature rise is the temperature dierence
between supply and return air.
With a properly designed system, the proper amount of
temperature rise will normally be obtained when the unit is
operated at rated input with the recommended blower speed.
If the correct amount of temperature rise is not obtained, it may
be necessary to change the blower speed. A higher blower
speed will lower the temperature rise. A slower blower speed will
increase the temperature rise.
Blower speed MUST be set to give the correct air
temperature rise through the unit as marked on the rating plate.
16
External Static Pressure Check
The total external static pressure must be checked on this unit to
determine if the airow is proper.
1. Using a digital manometer measure the static pressure of
the return duct at the inlet of the unit, (Negative Pressure).
Total External Static
2. Measure the static pressure of the supply duct, (Positive
Pressure).
3. Add the two readings together.
Both readings may be taken simultaneously and read
directly on the manometer is so desired.
4. Consult proper table for quantity of air.
If the external static pressure exceeds the minimum or maximum
allowable statics, check for closed dampers, dirty lters,
undersized or poorly laid out ductwork.
WARNING
TO AVOIPERSONAL INURY OR EATUE TO ELECTRIC SOC, REMOVE
ELECTRICAL POWER FROM TE UNIT EFORE CANGING SPEETAPS ON TE
LOWER MOTOR.
EEM Motors
Refer to the wiring diagram in the appendix to verify speed
tap settings.
DP14UM models are equipped with EEM motors. EEM motors
are constant torque motors with very low power consumption.
This motor is energized by 24V. Adjust the CFM for the unit by
changing the 24V low voltage leads to the speed terminal block
on the motor
SPEED
TAP
DEFINITI
ON
LEAD
COLOR
SPEED
TAP
DEFINITI
ON
LEAD
COLOR
SPEED
TAP
DEFINITI
ON
LEAD
COLOR
T1 Fan Only Green T2
High
Speed
T4
Low
Speed
Yellow
T3
Low
Speed
White T5
High
Speed
FAN ONLY
HEATING
COOLING
Single Stage Models
SPEED
TAP
DEFINITI
ON
LEAD
COLOR
SPEED
TAP
DEFINITI
ON
LEAD
COLOR
SPEED
TAP
DEFINITI
ON
LEAD
COLOR
T1 Fan Only Green T2 Heat White T3
Low
Speed
Purple
T4
High
Speed
Yellow
T5
High
Speed Hi-
Static
FAN ONLY
HEATING
COOLING
NOTE: Heating airow must be adjusted to provide the
temperature rise shown on rating plate.
ECM Motors
The DP16UM models are equipped with ECM circulating blower
motors. ECM circulating blower motors are constant airow
motors with very low power consumption. The ECM motor is
controlled by 24VAC signals passed from an ECM interface
module.
Thermostat leads when wired as per wiring diagram in appendix
provides four blower speed outputs: FAN ONLY, HEAT, HI COOL
and LOW COOL. These are 24VAC outputs and are passed to the
ECM interface module. Depending on applied thermostat inputs,
the ignition control will energize the appropriate blower speed
output with 24VAC. This signal is passed to the ECM interface
module, which in turn passes the signal to the ECM motor. The
ECM motor then operates at the correct speed, delivering the
appropriate airow.
FAN ONLY blower speed is approximately 75% of the
HIGH COOL speed.
DIP
SWITCH
12345678
ON
••••••••
OFF ••••••••
Switches Function
1, 2 Heating Speeds
3Unused
4OFF for Two-Stage
5, 6 Cooling Speeds
7, 8 Airfl ow Adjust
The blower speed as shipped from the factory should deliver
the correct airow. However, if installation conditions require a
dierent airow, the blower speed may be adjusted using the DIP
switches on the ECM interface module (located in the blower
compartment. Use the following gure and the airow tables in the
Appendix to set the desired blower speed.
Heating airow must be adjusted to provide the temperature
rise shown on rating plate. Blower speeds are programmed to
deliver adequate airow at rated external static pressure (ESP).
Refer to airow table provided in the Appendix for details.
Limit Check
Check limit control operation after 15 minutes of operation by
blocking the return air grille(s).
17
1. After several minutes the main burners must go OFF.
Blower will continue to run.
2. Remove air restrictions and main burners will relight after a
cool down period of a few minutes.
Adjust the thermostat setting below room temperature.
1. Main burners must go OFF.
2. Circulating Air Blower will continue to run for 90, 120, 150 or
180 seconds, depending on the setting.
If necessary, adjust fan OFF delay settings to obtain
satisfactory comfort level.
Unit Shutdown
1. Set the thermostat to lowest setting.
2. Turn o the electrical power supply to the unit.
3. Remove the heat exchanger door on the side of the unit by
removing screws.
4. Move the gas control valve switch to the OFF position. Do
not force.
5. Close manual gas shuto valve external to the unit.
6. Replace the heat exchanger door on the unit.
7. If cooling and/or air circulation will be desired, turn ON the
electrical power.
The outdoor temperature must be 60°F or higher before
making adjustments to charge.
Check all manual reset limit controls in heating circuit if
cooling mode does not operate.
The compressor includes components which are designed to
protect the compressor against abnormal operating conditions.
Refrigerant Charge Check
After completing airow measurements and adjustments the
unit’s refrigerant charge must be checked. The unit comes
factory charged, but this charge is based on 325 CFM per ton
and minimum ESP per AHRI test conditions (generally between
.15-.28 ESP). When air quantity or ESP is dierent than above,
the refrigerant charge must be adjusted to the proper amount.
All package units with xed orice devices are charged using the
super heat method at the compressor suction line.
After superheat is adjusted it is recommended to check unit
sub-cooling at the condenser coil liquid line out. For charge
adjustments, see superheat and sub-cooling charts show for each
model.
Checking Superheat
Refrigerant gas is considered superheated whenever its
temperature is higher than the saturation temperature
corresponding to its pressure. The degree of superheat equals
the degrees of temperature increase above the saturation
temperature at existing pressure. See Temperature - Pressure
Chart.
1. Run system at least 10 minutes to allow pressure to stabilize.
2. Temporarily install thermometer on suction (large) line near
compressor with adequate contact and insulate for best possible
reading.
3. Refer to the superheat table provided for proper system
superheat. Add charge to lower superheat or recover charge to
raise superheat.
65 70 75 80 85
100 ---10 10
95 - - 10 10 10
90 - - 12 15 18
85 -10 13 17 20
80 -10 15 21 26
75 10 13 17 25 29
70 10 17 20 28 32
65 13 19 26 32 35
60 17 25 30 33 37
Ambient Condenser Inlet
Temp (°F Drybulb)
Return Air Temp. (°F Drybulb)
a. Suction Pressure = 143
b. Corresponding Temp. °F. = 50
c. Thermometer on Suction Line = 59°F.
To obtain the degrees temperature of superheat, subtract 50.0
from 59.0°F.
The dierence is 9° Superheat. The 9° Superheat would fall in the
± range of allowable superheat.
Checking Subcooling
Refrigerant liquid is considered subcooled when its temperature
is lower than the saturation temperature corresponding to its
pressure. The degree of subcooling equals the degrees of
temperature decrease below the saturation temperature at the
existing pressure.
1. Attach an accurate thermometer or preferably a
thermocouple type temperature tester to the liquid line
close to the pressure switch.
2. Install a high side pressure gauge on the liquid access tting.
3. Record the gauge pressure and the temperature of the line.
18
4. Compare the hi-pressure reading to the “Required Liquid
Line Temperature” chart. Find the hi-pressure value on the
left column. Follow that line right to the column under the
design subcooling value. Where the two intersect is the
required liquid line temperature.
Alternately you can convert the liquid line pressure gauge
reading to temperature by nding the gauge reading in
Temperature
- Pressure Chart and reading to the left, nd the
temperature in the °F. Column.
5. The dierence between the thermometer reading and
pressure to temperature conversion is the amount of
subcooling.
EXAMPLE:
a. Liquid Line Pressure = 417
b. Corresponding Temp. °F. = 120°
c. Thermometer on Liquid line = 109°F.
To obtain the amount of subcooling, subtract 109°F from 120°F
The dierence is 11° subcooling. See the specication sheet or
technical information manual for the design subcooling range for
your unit.
See R410A Pressure vs. Temperature chart.
Check unit charge before putting the cooling section into
full operation. The unit has a thermostatic expansion valve
metering device. To ensure the unit is properly charged for the
intended application, check the unit refrigerant sub-cooling at the
condenser. The refrigerant sub-cooling is a function of outdoor
ambient temperature and return air temperature of the conditioned
space. It is the installing contractors responsibility to ensure the
proper refrigerant sub-cooling at the condenser is adjusted for
each application. As the outdoor ambient temperature rises the
sub-cooling decreases and as the outdoor ambient temperature
lowers, the sub-cooling increases.
Proper sub-cooling adjustment optimizes cooling
performance. Models equipped with thermostatic expansion valve,
charge the system to sub-cooling, range shown on chart, when
necessary, adjust expansion valve stem for superheat setting.
The expansion valve will not need adjustment for most
applications. Ensure system superheat is set within range listed
on chart.
DP16UM3008041
8 - 12
8 - 12
10 - 14
DP16UM3608041
10 - 14
Superheat °F
3 - 7
4 - 8
4 - 8
2 - 6
9 - 13
DP14UM610804*
DP14UM300604*
DP14UM360604*
DP14UM360804*
DP14UM480804*
8 - 14
9 - 15
8 - 14
Subcooling °F
12 - 18
8 - 14
DP14UM240404*
10 - 14
8 - 14
DP14UM420804*
8 - 12
9 - 15
Models #
Design superheat & subcooling @ 95 °F outdoor ambient
temperature
Superheat Adjustment
To adjust superheat, remove the control box cover and locate the
expansion valve on the liquid line of the evaporator. Unscrew the
cover from the expansion valve, locate the adjustment screw, and
turn it clockwise (in) to increase superheat or counterclockwise
(out) to decrease superheat. Replace adjustment cap. Wait a
minimum of 10 minutes between adjustments to allow time for the
TXV and pressures to stabilize.
Cooling Operation
NOTE: Mechanical cooling cannot be reliably provided at ambient
temperatures below 50° F.
1. Turn on the electrical power supply to the unit.
2. Place the room thermostat selector switch in the COOL
position (or AUTO if available, and if automatic changeover
from cooling to heating is desired).
3. Set the room thermostat to the desired temperature.
Troubleshooting
The following presents probable causes of questionable
unit operation. Refer to Diagnostic Indicator Chart for an
interpretation of the signal and to this section for an explanation.
Remove the control box access panel and note the number of
diagnostic LED ashes. Refer to Diagnostic Indicator Chart for an
interpretation of the signal and to this section for an explanation.
The ignition control is equipped with a momentary push-button
switch that can be used to display on the diagnostic LED the last
ve faults detected by the control. Any time the control is powered,
the fault code history can be retrieved for display by depressing
and releasing the button once (less than 5 seconds); the LED
will ash the Fault Code History (up to 5 fault codes from newest
to oldest). The Fault Code History is retained between power
cycles until cleared. A fault code is added to the history log as it
is encountered if it diers from the most recent history log item. If
the history log is already full, then the oldest entry is dropped from
the log and the remaining entries are moved down in the Fault
Code History so that the new fault can be added to the Fault Code
History as the most recent fault.
Do not hold for longer than 5 seconds. Holding the button
for 5 seconds or higher will erase the memory!
An external lockout occurs if the integrated ignition control
determines that a measurable combustion cannot be established
within three (3) consecutive ignition attempts. If ame is not
established within the four (4) second trial for ignition, the gas
valve is de-energized, 30 second inter-purge cycle is completed,
and ignition is re-attempted. The control will repeat this routine
three times if a measurable combustion is not established. The
control will then shut o the induced draft blower and go into a
lockout state.
If ame is established but lost, the control will energize the
circulator blower at the heat speed and then begin a new ignition
sequence. If ame is established then lost on subsequent
attempts, the control will recycle the ignition sequence.
19
The diagnostic fault code is 1 ash for a lockout due to failed
ignition attempts. The integrated control will automatically reset
after one hour, or it can be reset by removing the thermostat
signal or disconnecting the electrical power supply for over ve
seconds.
If you have to frequently reset your gas/
electric package unit, it means that a problem exists that should
be corrected. Contact a qualied servicer for further information.
The pressure sensor is mounted near induced draft blower. Its
function is to regulate the induced draft blower’s speed in order
to maintain proper air-fuel ratio for clean and reliable combustion.
The electrical output signal from the sensor is expected to be
proportional to the magnitude of the dierential pressure between
the inducer inlet negative pressure and the ambient air pressure.
The pressure sensor also guards against insucient airow
(combustion air and ue products) through the heat exchanger.
At the beginning of a call for heat, the control ensures the inducer
is in an o state, then checks the pressure sensor output for the
proper null oset value. If the pressure sensor output is outside
the acceptable range for the null value, the control enters a ve
minute lockout. After the lockout timer has expired, the control
resumes normal operation.
During inducer operation, including all operating modes except for
the null test, the control monitors the pressure sensor output for
expected values. The control limits during normal operation are
expected to be within certain tolerances of the target pressures.
In response to a pressure sensor span error, the control enters a
ve minute lockout. After the lockout timer has expired, the control
resumes normal operation.
A primary limit will open due to excessive supply air temperatures.
This can be caused by a dirty lter, excessive duct static,
insucient air ow, or a faulty limit. Check lters, total external
duct static, blower motor, blower motor speed tap (see wiring
diagram), and limit. This limit will automatically reset once the
temperature falls below a preset level.
If a limit switch opens, the gas valve is immediately de-energized,
the induced draft and air circulating blowers are energized. The
induced draft and air circulator blowers remain energized for 5
minutes or until the limit switch re-closes, whichever happens rst.
If the primary limit opens three (3) times within the same
call for heat, the ignition control will lock out for one (1) hour with
the air circulating blower energized at high heat speed.
If ame is detected with the gas valve de-energized, the
combustion and air circulator blowers are energized. The control
can be reset by removing the power supply to the unit or it will
automatically reset after one hour. Miswiring is the probable
cause for this fault. The initial lockout period is 5 minutes. After
that time, the control continues to monitor the ame sense input
and resumes normal operation when ame is no longer sensed.
Under some conditions, the fuel or air supply can create a nearly
invisible coating on the ame sensor. This coating acts as an insu-
lator causing a drop in the ame signal. If the ame signal drops
below a predetermined value, the ignition control will display an
error code of (1) ash on the amber diagnostic LED. The unit will
continue to operate until the control can no longer detect ame.
The burner temperature switch is mounted on the burner
assembly to monitor the burner box temperature. It is normally
closed (electrically), auto-reset sensor. This switch guards
against the burner ames not being properly drawn into the heat
exchanger.
The control senses an open blocked burner switch, indicating
that the burner temperature/pressure has exceeded its set point.
The control de-energizes the gas valve, energizes the inducer to
the pre-purge setting and energizes the indoor blower. The initial
lockout period is ve minutes. After this time elapses, the control
evaluates the state of the blocked burner switch. If the switch is
closed, the control resumes normal operation. The control will
enter a one hour lockout state if the blocked burner switch fails to
reset before the recovery timer has expired.
The control operational parameters are stored in ID Plug which
connects on the circuit board. The control requires a valid ID
plug present to operate in heating mode. If a valid ID plug is not
present the control will not respond to a call for heat. However,
the control will respond to thermostat inputs “Y” or “G”, operating
the appropriate fan output. The cooling delays are ignored in this
operating mode. The control puts the burner into hard lockout and
will not respond to heating requests until the power is cycled with
a valid ID plug installed.
In the event of intermittent power losses or intermittent thermostat
operation, the control system will delay output to the compressor
contactor for three minutes from the time power is restored or
thermostat call for cooling is restored. (Compressor is o a total
of three minutes).
Some electronic thermostats also have a built-in
compressor short cycle timer that may be longer than the
three minute delay given above. If you are using an electronic
thermostat and the compressor has not started after three
minutes, wait an additional ve minutes to allow the thermostat to
complete its short cycle delay time.
Some models include a high pressure cutout switch and/or a loss
of charge cutout switch. The high pressure cutout switch protects
the refrigeration system from excessive operating pressures. The
loss of charge cutout switch protects the refrigeration system
from very low operating pressures due to a loss of refrigerant.
Compressor operation will be disabled if either of these devices
opens.
Maintenance
Have the gas heating section of the unit checked at least once
a year before the heating season begins, to be sure that the
combustion air inlet and ue outlet hoods are not blocked by
debris, which would prevent adequate combustion air and a
properly operating vent system.
20
A return air lter is not supplied with this unit; however, there must
be a means of ltering all of the return air. The lter(s) may be
located in the return air duct(s), or return air lter grille(s). Consult
with your installing dealer for the actual location of the return air
lter(s) for your unit.
Dirty lters are the most common cause of inadequate heating
or cooling performance. Filter inspection should be made at
least every two months; more often if necessary because of local
conditions and usage.
Dirty throwaway lters should be discarded and replaced with
a new, clean lter. Dirty permanent lters should be washed
with water, thoroughly dried and sprayed with a lter adhesive
before being reinstalled. (Filter adhesives may be found at many
hardware stores.) Permanent lters should last several years.
However, should one become torn or uncleanable, it should be
replaced.
Use a ne grade automotive wax on the cabinet nish to maintain
the nishes original high luster. This is especially important in
installations with extended periods of direct sunlight.
The coil with the outside air owing over it should be inspected
annually and cleaned as frequently as necessary to keep the
nned areas free of lint, hair and debris.
Bearings on the air circulating blower motor, condenser motor
and the combustion fan motor are permanently lubricated. No
additional oiling is required.
A drop in the ame current can be caused by a nearly invisible
coating on the ame sensor. This coating, created by the fuel or
combustion air supply, can be removed by carefully cleaning the
ame sensor with steel wool.
After cleaning, the microamp signal should be stable and
in the range of 5-10 microamps DC.
At the start of each heating season, inspect and, if necessary,
clean the unit ue passage.
1. Shut o electric power and gas supply to the unit.
2. Remove burner assembly by disconnecting the gas line and
removing the manifold bracket from the partition panel.
3. Remove the ue from the induced draft blower and the
collector box cover from the partition panel.
4. The primary heat exchanger tubes can be cleaned using a
round wire brush attached to a length of high grade stainless
steel cable, such as drain cleanout cable. Attach a variable
speed reversible drill to the other end of the spring cable.
Slowly rotate the cable with the drill and insert it into one of
the primary heat exchanger tubes. While reversing the drill,
work the cable in and out several times to obtain sucient
cleaning. Use a large cable for the large tube, and then
repeat the operation with a small cable for the smaller tube.
Repeat for each tube.
5. When all heat exchanger tubes have been cleaned, replace
the parts in the reverse order in which they were removed.
6. To reduce the chances of repeated fouling of the heat
exchanger, perform the steps listed in “Startup, Adjustments,
and Checks”.
The Ultra low NOx models are equipped with premix burner. The
burner box is sealed to achieve safe and reliable operation. The
burner box should not have any blockage near the air-gas mixer
inlet.
For further information on the yearly inspection, consult the User
Manual. It is recommended that a qualied servicer inspect and
service the unit at least once each year.
Turn the unit on at the thermostat. Wait a few minutes, since any
dislodged dust will alter the normal ame appearance. Flames
should be predominantly blue and directed into the tubes. They
should not be yellow. They should extend directly outward from
the burner ports without curling downward, oating or lifting o the
ports.
This manual suits for next models
10
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