Daikin MPS A03C, MPS A04C, MPS H04C, MPS H05C, MPS A05C Installation And Maintenance Manual
...
Installation and Maintenance Manual IM 970-2
Group: Applied Air Handling
Part Number: 920102421-20
Date: May 2017
Maverick® I
Heating & Cooling
Models MPSA03 – A05, 14 SEER
Models MPSH03 – H05, 15 SEER
3 to 5 Tons
R-410A Refrigerant
Table of ConTenTs
Introduction..................................3
General ....................................3
Checking Product Received ....................3
Hazardous Information Messages ...............3
Mechanical Installation ........................4
General ....................................4
Major Components ...........................4
Pre-Installation Check-Points ...................4
Location Considerations .......................4
Outside Slab Installation .......................5
Attaching Exhaust and Combustion Air Inlet Hoods ..5
Cover Panel Installation/Conversion .............5
Clearances .................................6
Rigging and Roof Curb ........................7
Gas Supply, Condensate Drain and Piping .........8
Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . 11
Power Supply ..............................11
Customer Supplied Thermostat.................14
Optional Factory Supplied Thermostat ...........14
Wiring Diagrams.............................15
Physical Data ...............................25
Unit Capacity and Physical Data................25
Motor Data ................................27
MCA and MCOP Data ........................27
Dimensional Data ............................29
Table of ConTenTs
Unit Dimensions MPS A03C – A05C.............29
Performance Data............................30
System Performance – Standard Efciency .......30
System Performance – High Efciency...........33
Airow Performance .........................36
Accessories ................................40
Economizers ...............................40
Roof Curbs ................................42
Controls and Operation .......................43
Furnace Section Controls and Ignition System .....43
Dehumidication Control ......................45
Maintenance ................................47
General ...................................47
Unit Maintenance ...........................47
System Charge Charts .......................49
Blower Motor Speed Taps .....................52
Troubleshooting .............................54
Warranty ...................................57
Replacement Parts ..........................57
IM 970-2 • MAVERICK I ROOFTOP 2 www.DaikinApplied.com
General
This manual contains the installation and operating instructions
for your packaged rooftop unit. There are some precautions
that should be taken to derive maximum satisfaction from it.
Improper installation can result in unsatisfactory operation or
dangerous conditions.
Read this manual and any instructions packaged with separate
equipment prior to installation. Give this manual to the owner
and explain its provisions. The owner should retain this manual
for future reference.
This product line does have an optional DDC controller. For
operation and information on using and programming the
MicroTech® III unit controller, refer to the appropriate operation
manual (see Table 1).
For a description of operation and information on using
the keypad to view data and set parameters, refer to the
appropriate program-specic operation manual (see Table 1).
Table 1: Operation, Installation and Maintenance
Resources
Unit Manual
Rooftop Unit Control Conguration Operation Manual Bulletin Number
DDC Unit Controller OM 1077
BACnet Communication Module IM 1000
LonWorks Communication Module IM 999
InTroduCTIon
Hazardous Information Messages
DANGER
The manufacturer’s warranty does not cover any damage or defect to
the air conditioner caused by the attachment or use of any components,
accessories or devices (other than those authorized by the manufacturer)
into, onto, or in conjunction with the air conditioner. you should be aware
that the use of unauthorized components, accessories or devices may
adversely affect the operation of the air conditioner and may also endanger
life and property. The manufacturer disclaims any responsibility for such
loss or injury resulting from the use of such unauthorized components,
accessories or devices.
WARNING
Provide adequate combustion and ventilation air to the unit space as
specied in the combustion and ventilation air section of these instructions.
CAUTION
Install this unit only in a location and position as specied in the “Mechanical
Installation” section of these instructions. Provide adequate combustion
and ventilation air to the unit space as specied in the venting section of
these instructions.
WARNING
Combustion products must be discharged outdoors. Connect this unit to an
approved vent system only, as specied in “Mechanical Installation” section
of these instructions.
InTroduCTIon
Checking Product Received
Upon receiving the unit, inspect for any damage from
shipment. Claims for damage, either shipping or concealed,
should be led immediately with the shipping company.
Important: Check the unit model number, heating size,
electrical characteristics, and accessories to determine if they
are correct.
NOTICE
Use only with type of gas approved for this unit. Refer to the unit rating
plate.
DANGER
Never test for gas leaks with an open ame. It can cause an explosion
or re resulting in property damage, personal injury or death. Use a
commercially available soap solution made specically for the detection of
leaks to check all connections, as specied in the “Mechanical Installation”
section of these instructions.
NOTICE
Always install unit to operate within the unit’s intended temperature-rise
range with a duct system which has an external static pressure within the
allowable range, as specied in the “Mechanical Installation” section of
these instructions. See also unit rating plate.
DANGER
Units are not design certied to be installed inside the structure. Doing so
can cause inadequate unit performance as well as property damage and
carbon monoxide poisoning resulting in personal injury or death.
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General
MeChanICal InsTallaTIon
MeChanICal InsTallaTIon
Location Considerations
WARNING
When a unit is installed so that supply ducts carry air circulated by the unit
to areas outside the space containing the unit, the return air shall also be
handled by duct(s) sealed to the unit casing and terminating outside the
space containing the unit.
Install this unit in accordance with The American National
Standard Z223.1-latest edition manual entitled “National Fuel
Gas Code,” and the requirements or codes of the local utility or
other authority having jurisdiction.
Additional helpful publications available from the “National Fire
Protection Association” are: sNFPA-90A - Installation of Air
Conditioning and Ventilating Systems 1985 or latest edition.
NFPA-90B - Warm Air Heating and Air Conditioning Systems
1984.
These publications are available from:
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
Major Components
The unit includes a hermetically-sealed refrigerating system
(consisting of a scroll compressor, condenser coil, and
evaporator coil with a thermal expansion valve), a circulation
air blower, and a condenser fan. The cooling system of these
units is factory-evacuated, charged and performance tested.
Refrigerant amount and type are indicated on rating plate.
Heat options include natural gas red furnace or a eld
installed electric resistance heater. The furnace assembly
comes complete including a heat exchanger assembly, gas
burner and control assembly, combustion air motor and fan,
and all necessary internal electrical wiring.
Pre-Installation Check-Points
Before attempting any installation, carefully consider the
following points:
A. Structural strength of supporting members (rooftop
installation)
B. Clearances and provision for servicing power supply
and wiring
C. Gas supply and piping
D. Air duct connections and sizing
E. Drain facilities and connections
F. Location for minimum noise and vibration - away from
bedroom windows
WARNING
This unit may be used to heat the building or structure during construction
if the following installation requirements are met. Installation must comply
with all installation instructions including:
• Proper vent installation
• Furnace operating under thermostatic control
• Return air duct sealed to the furnace
• Air lters in place
• Set furnace input rate and temperature rise per rating plate marking
• Means of providing outdoor air required for combustion
• Return air temperature maintained between 55°F (13°C) and 80°F
(27°C)
• Installation of exhaust and combustion air inlet hoods completed
• Clean furnace, duct work and components upon substantial
completion of the construction process, and verify furnace operating
conditions including ignition, input rate, temperature rise and
venting, according to the instructions.
The metal parts of this unit may be subject to rust or
deterioration in adverse environmental conditions. This
oxidation could shorten the equipment’s useful life. Salt spray,
fog or mist in seacoast areas, sulphur or chlorine from lawn
watering systems, and various chemical contaminants from
industries such as paper mills and petroleum reneries are
especially corrosive.
If the unit is to be installed in an area where contaminants are
likely to be a problem, give special attention to the equipment
location and exposure.
1. Avoid having lawn sprinkler heads spray directly on the
unit cabinet.
2. In coastal areas, locate the unit on the side of the
building away from the waterfront.
3. Shielding by a fence or shrubs may give some protection.
4. Frequent washing of the cabinet, fan blade and coil
with fresh water will remove most of the salt or other
contaminants that build up on the unit.
5. Regular cleaning and waxing of the cabinet with a good
automobile polish will provide some protection.
6. A good liquid cleaner may be used several times a year
to remove matter that will not wash off with water.
Several different types of protective coatings are offered in
some areas. These coatings may provide some benet, but the
effectiveness of such coating materials cannot be veried by
the equipment manufacturer.
The best protection is frequent cleaning, maintenance, and
minimal exposure to contaminants.
IM 970-2 • MAVERICK I ROOFTOP 4 www.DaikinApplied.com
MeChanICal InsTallaTIon
Outside Slab Installation
DANGER
These units are designed certied for outdoor installation only. Installation
inside any part of a structure can result in inadequate unit performance as
well as property damage. Installation inside can also cause recirculation
of ue products into the conditioned space resulting in personal injury or
death.
Typical outdoor slab installation is shown in Figure 1.
1. Select a location where external water drainage cannot
collect around unit.
2. Provide a level slab sufciently high enough above grade
to prevent surface water from entering the unit
3. The location of the unit should be such as to provide
proper access for inspection and servicing as shown in
Figure 3 on page 6.
4. Locate unit where operating sounds will not disturb
owner or neighbors.
5. Locate unit so roof runoff water does not pour directly on
the unit. Provide gutter or other shielding at roof level. Do
not locate unit in an area where excessive snow drifting
may occur or accumulate.
6. Where snowfall is anticipated, the height of the unit
above the ground level must be considered. Mount
unit high enough to be above anticipated maximum
area snowfall and to allow combustion air to enter the
combustion air inlet.
7. Select an area which will keep the areas of the vent,
air intake, and A/C condenser ns free and clear of
obstructions such as weeds, shrubs, vines, snow, etc.
Inform the user accordingly.
8. Remove compressor shipping supports (if so equipped)
after installation.
Figure 1: Outside Slab Installation
Attaching Exhaust and
Combustion Air Inlet Hoods
IMPORTANT
Do not operate this unit without the exhaust/ combustion air inlet hood
properly installed. This hood is shipped in a carton in the blower compartment
inside the unit and must be attached when the unit is installed. See Figure
29 on page 29.
To attach exhaust/combustion air inlet hood:
1. Remove screws securing blower access panel and
remove access panel. For location of blower access
panel, see Figure 28 on page 29.
2. Remove exhaust/combustion air inlet hood from the
carton, located inside the blower compartment.
3. Attach blower access panel.
4. Attach the combustion air inlet/exhaust hood with
screws. Reference Figure 29 on page 29 for proper
location. Screws are in carton with the hood.
5. Vent the unit using the ue exhaust hood, as supplied
from the factory, without alteration or addition.
Cover Panel Installation/
Conversion
Downow to Horizontal
1. Remove the screws and covers from the outside of the
supply and return sections.
2. Install the covers in the bottom supply and return
openings with the painted side up (Figure 2). Use the
existing gasket to seal the covers.
3. Secure the supply cover to the base of the unit with one
screw, engaging prepunched tab in unit base.
4. Secure the return cover to the base of the unit with
screws engaging prepunched holes in the unit base.
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Figure 2: Cover Gasket Detail–Down-Flow to Horizontal
This unit is provided with 2 - 25” × 16” × 1” disposable lters. When
replacing lters, ensure they are inserted fully to the back to prevent
bypass.
Clearances
The following minimum clearances (Table 2) must be observed
for proper unit performance and serviceability (also reference
Figure 3).
NOTE: Supply duct may be installed with 0" clearance
to combustible materials, provided 1" minimum
Fiberglass insulation is applied either inside or
outside of the duct.
MeChanICal InsTallaTIon
Ductwork
DANGER
Never connect return ductwork to any other heat producing device such as
replace insert, stove, etc. Unauthorized use of such devices may result
in re, carbon monoxide poisoning, explosion, personal injury, property
damage or death.
Rooftop Installation
NOTICE
If unit will not be put into service immediately, block off supply and return
air openings to prevent excessive condensation.
1. Before locating the unit on the roof, make sure that the
roof structure is adequate to support the weight involved
(see “Unit Capacity and Physical Data” on page 25).
THIS IS VERY IMPORTANT AND THE INSTALLER’S
RESPONSIBILITY.
2. For rigging and roofcurb details, see Figure 5, Figure 6
and Figure 7.
3. The location of the unit on the roof should be such as to
provide proper access for inspection and servicing.
4. Remove compressor shipping supports (if so equipped)
after installation.
Figure 3: Clearances
The installing contractor should fabricate ductwork in
accordance with local codes. Use industry manuals as a
guide when sizing and designing the duct system. Contact
Air Conditioning Contractors of America, 1513 16th St. N.W.,
Washington, D.C. 20036.
Place the unit as close to the conditioned space as possible
allowing clearances as indicated. Run ducts as directly as
possible to supply and return outlets. Use of non-ammable
weatherproof exible connectors on both supply and
return connections at unit to reduce noise transmission is
recommended.
On ductwork exposed to outside temperature and humidity,
use a minimum of 2" of insulation and a vapor barrier.
Distribution system in attic, furred space or crawl space
should be insulated with at least 2" of insulation. ½" to 1"
thick insulation is usually sufcient for ductwork inside the air
conditioned space.
Provide balancing dampers for each branch duct in the supply
system. Properly support ductwork from the structure.
Table 2: Recommended Clearances
Location Clearance
A - Front 48"
B - Condenser Coil 18"
C - Duct Side 12"*
D - Evaporator End 36"
E - Above 60"
NOTE: *without Economizer. 57" with Economizer.
IM 970-2 • MAVERICK I ROOFTOP 6 www.DaikinApplied.com
Figure 4: Unit Mounted on Roof Curb
MeChanICal InsTallaTIon
Return Air
DANGER
Never allow products of combustion or the ue products to enter the return
air ductwork or the circulating air supply. All return ductwork must be
adequately sealed and secured to the furnace with sheet metal screws and
joints must be taped. All other duct joints must be secured with approved
connections and sealed airtight.
Failure to prevent products of combustion from being circulated into the
living space can create potentially hazardous conditions, including carbon
monoxide poisoning that could result in personal injury or death.
In the event that the return air ducts must be run through an
“unconned” space containing other fuel burning equipment,
it is imperative that the user be informed against future
changes in construction which might change this to a “conned
space.” Also, caution the user against any future installation
of additional equipment (such as power ventilators, clothes
dryers, etc.) within the existing unconned and/or conned
space which might create a negative pressure within the
vicinity of other solid, liquid, or gas fueled units.
Rigging and Roof Curb
Figure 5: Rigging Detail
Figure 6: Roof Curb
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Figure 7: Roof Curb Detail
Gas Supply, Condensate Drain and Piping
Gas Connection
WARNING
Connect this unit only to gas supplied by a commercial utility.
DANGER
Never test for gas leaks with an open ame. It can cause an explosion
or re resulting in property damage, personal injury or death. Use a
commercially available soap solution made specically for the detection of
leaks to check all connections, as specied in the “Mechanical Installation”
section of these instructions.
CAUTION
Any additions, changes or conversions required for the furnace to
satisfactorily meet the application should be made by a qualied installer,
service agency or the gas supplier, using factory-specied or approved
parts. In the commonwealth of Massachusetts, installation must be
performed by a licensed plumber or gas tter for appropriate fuel.
NOTE: The use of exible gas connectors is not permitted.
Figure 8: Suggested Gas Piping
MeChanICal InsTallaTIon
The Commonwealth of Massachusetts requires the
gas shut-off valve to be a T-handle gas lock.
CAUTION
Disconnect the furnace and its individual shutoff valve from the gas supply
piping during any pressure testing of that system at test pressures in excess
of 1/2 pound per square inch gauge or isolate the system from the gas
supply piping system by closing its individual manual shutoff valve during
any pressure testing of this gas supply system at pressures equal to or less
than 1/2 PSIG.
NOTICE
Check the rating plate to make certain the unit is equipped to burn the type
of gas supplied. Care should be taken after installation of this equipment
that the gas control valve not be subjected to high gas supply line pressure.
1. Install gas piping in accordance with local codes and
regulations of the local utility company. In the absence
of local codes, the installation must conform to the
specications of the National Fuel Gas Code, ANSI
Z223. 1 - latest edition.
2. Connect the gas line to the gas pipe inlet opening
provided into the ½" inlet valve. See Figure 1 on page
5 or Figure 4 on page 6 for typical piping.
3. Size the gas line to the furnace adequate enough to
prevent undue pressure drop and never less than ½".
4. Install a drip leg or sediment trap in the gas supply line
as close to the unit as possible.
5. Install an outside ground joint union to connect the gas
supply to the control assembly at the burner tray.
6. Gas valves have been factory installed. Install a manual
gas valve where local codes specify a shut-off valve
outside the unit casing (see Figure 8).
7. Make sure piping is tight. A pipe compound resistant to
the action of liqueed petroleum gases must be used at
all threaded pipe connections.
Table 3: Gas Pipe Capacity Table (Cu. Ft./Hr.)
Nominal
Iron Pipe
Size 10 20 30 40 50 60 70 80
1/2" 132 92 73 63 56 50 46 43
3/4" 278 190 152 130 115 105 96 90
1" 520 350 285 245 215 195 180 170
1-1/4" 1,050 730 590 500 440 400 370 350
1-1/2" 1,600 1,100 890 760 670 610 560 530
Equivalent Length of Pipe, Feet
In making gas connections, avoid strains as they may cause
noise and damage the controls. A backup wrench is required to
be used on the valve to avoid damage.
The capacities of gas pipe of different diameters and lengths in
cu. ft. per hr. with pressure drop of 0.3 in. and specic gravity
of 0.60 (natural gas) are shown in Table 3.
After determining the pipe length, select the pipe size which will
provide the minimum cubic feet per hour required for the gas
input rating of the furnace. By formula:
Gas Input of Furnace
(BTU/Hr.)
Cu. Ft. Per Hr. Required =
_________________
Heating Value of Gas
(BTU/Ft.)
The gas input of the furnace is marked on the furnace
rating plate. The heating value of the gas (BTU/FT3) may be
determined by consulting the local natural gas utility or the L.P.
gas supplier.
IM 970-2 • MAVERICK I ROOFTOP 8 www.DaikinApplied.com
LP Conversion
DANGER
This unit is equipped at the factory for use with natural gas only. Conversion
to LP gas requires a special kit supplied by the distributor or manufacturer.
Mailing addresses are listed on the furnace rating plate, parts list and
warranty. Failure to use the proper conversion kit can cause re, carbon
monoxide poisoning, explosion, personal injury, property damage, or death.
NOTICE
To remove the gas valve, remove the four screws securing the manifold
pipe to the burner tray. Remove the manifold pipe with gas valve attached.
See Figure 10.
Convert the valve to use liqueed petroleum (LP) gas by
replacing the pressure regulator spring with the conversion kit
spring. This LP kit spring allows the regulator to maintain the
proper manifold pressure for LP gas. The correct burner LP
orices are included in the kit. See Figure 9.
NOTE: Order the correct LP conversion kit from the furnace
manufacturer. See Conversion Kit Index shipped with
unit for proper LP kit number. Furnace conversion to
LP gas must be performed by a qualied technician.
MeChanICal InsTallaTIon
Figure 9: NOx Inserts
Figure 10: Manifold Pipe
NOx Models
When converting units equipped with NOx inserts to LP gas,
the stainless steel screen mesh inserts in the entrance of the
tubular exchangers are not required to meet SCAQMD NOx
emission levels. These inserts and 1/8” diameter retaining rod
should be carefully removed before ring this furnace on LP
gas. Important: This furnace is not designed to operate on LP
gas with the NOx inserts in place.
Step by step instructions on removing the NOx inserts and
retaining rod are included in the Conversion Kit Installation
Instructions.
Table 4: LP Gas Pipe Capacity Table (Cu. Ft./Hr.)
Maximum capacity of pipe in thousands of BTU/hour of undiluted liquied
petroleum gases at 11 inches water column inlet pressure (Based on a
pressure drop of 0.5 inch water column).
Nominal
Iron Pipe
Size (in.)
Example (LP): Input BTU requirement of unit, 150,000
10 20 30 40 50 60 70 80 90 100 125 150
1/2 275 189 152 129 114 103 96 89 83 78 69 63
3/4 567 393 315 267 237 217 196 182 173 162 146 132
1 1071 732 590 504 448 409 378 346 322 307 275 252
1-1/4 2205 1496 1212 1039 913 834 771 724 677 630 567 5 11
1-1/2 3307 2299 1858 1559 1417 1275 1181 1086 1023 976 866 787
2 6221 4331 3465 2992 2646 2394 2205 2047 1921 1811 1606 1496
Equivalent lenght of pipe, 60 ft. = 3/4" IPS required
Length of Pipe (ft.)
Manifold Pipe
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Adjusting or Checking Furnace Input
• Natural Gas Line Pressure 5" – 10.5" W.C.
• LP Gas Line Pressure 11" – 13" W.C.
• Natural Gas Manifold Pressure – 3.5" W.C
• LP Gas Manifold Pressure – 10" W.C.
Supply and manifold pressure taps are located on the gas
valve body ⅛" N.P.T. and on the manifold.
Use a properly calibrated manometer gauge for accurate gas
pressure readings.
Only small variations in the gas ow should be made by means
of the pressure regulator adjustment. Furnaces functioning
on LP gas must be set by means of the tank or branch supply
regulators. The furnace manifold pressure should be set at
10" W.C. at the gas control valve.
To adjust the pressure regulator, remove the regulator cap
and turn the adjustment screw clockwise to increase pressure
or counterclockwise to decrease pressure. Then replace the
regulator cap securely.
Any necessary major changes in the gas ow rate should be
made by changing the size of the burner orices. To change
orice spuds, shut off the manual main gas valve and remove
the gas manifold.
For elevations up to 2,000 feet, rating plate input ratings apply.
For high altitudes (elevations over 2,000 ft.), contact Daikin
Applied Parts.
Check of input is important to prevent over-ring of the furnace
beyond its design-rated input. NEVER SET INPUT ABOVE
THAT SHOWN ON THE RATING PLATE. Use the following
table or formula to determine input rate.
MeChanICal InsTallaTIon
Table 5: Meter Times
Meter time, in minutes and seconds, for normal input
rating of furnaces equipped for natural or LP gas
Input
BTU/hr
40,000
60,000
80,000
100,000
Meter
Size
Cu.Ft.
1 1:21 1:30 1:34 1:39 3:45
10 13:30 15:00 15:36 16:30 37:30
1 0:54 1:00 1:03 1:06 2:30
10 9:00 10:00 10:24 11:00 25:00
1 0:41 0:45 0:47 0:50 1:53
10 6:45 7:30 7:48 8:15 18:45
1 0:33 0:36 0:38 0:40 1:30
10 5:24 6:00 6:15 6:36 15:00
Heating value of gas BTU per cu. ft.
900 1000 1040 1100 2500
Important notice: Derating of the heating input for high
altitude in the eld is unlawful in Canada (refer to CAN/ CGA
2.17). Units installed in altitudes greater than 2,000 feet (610
meters) must be shipped from the factory or from a factory
authorized conversion station with the heating input derated by
10% so as to operate properly in altitudes from 2,000 – 4,500
feet (610 – 1,373 meters).
Condensate Drain
The condensate drain connection of the evaporator is threaded
¾" nominal P.V.C. pipe. Install a condensate trap to ensure
proper condensate drainage (Figure 11)
Figure 11: Condensate Drain
Heating Value of Gas
(BTU/Cu. Ft.) × 3600
Cu. Ft. Per Hr. Required =
_________________
Time in Seconds
(for 1 Cu. Ft.) of Gas
Start the furnace and measure the time required to burn one
cubic foot of gas. Prior to checking the furnace input, make
certain that all other gas units are shut off, with the exception of
pilot burners. Time the meter with only the furnace in operation.
Important note for altitudes above 2,000 feet (610 meters):
The main burner orices in your furnace and in these kits are
sized for the nameplate input and intended for installations
at elevations up to 2,000 feet in the USA or Canada, or
for elevations of 2,000 – 4,500 feet (610 – 1,373 meters)
in Canada if the unit has been derated at the factory. For
elevations above 2,000 feet (610 meters) in the USA only
(see ANSI-Z223.1), the burner orices must be sized to reduce
the input 4% for each 1,000 feet (305 meters) above sea level.
DO NOT OVERTIGHTEN DRAIN FITTING
IM 970-2 • MAVERICK I ROOFTOP 10 www.DaikinApplied.com
Power Supply
DANGER
Power supply to the unit must be disconnected before making eld
connections. To avoid electrical shock, personal injury or death, be sure to
rigorously adhere to eld wiring procedures regarding proper lockout and
tagout of components.
NOTICE
This unit is approved for use with copper conductors only connected to unit
contactor. Warranty may be jeopardized if aluminum wire is connected to
unit contactor.
Special instructions apply for power wiring with aluminum conductors:
Warranty is void if connections are not made per instructions.
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Figure 12: Recommended Branch Circuit Disconnect
Location – Gas Heat Units
1. All wiring should be made in accordance with the
National Electrical Code. Consult the local power
company to determine the availability of sufcient
power to operate the unit. Check the voltage at power
supply to make sure it corresponds to the unit’s RATED
VOLTAGE REQUIREMENT. Install a branch circuit
disconnect (refer to Figure 12 and Figure 13) near the
rooftop, in accordance with the N.E.C., C.E.C. or local
codes. A bracket is provided with the unit for mounting
of the disconnect.
2. It is important that proper electrical power is available at
the unit. Voltage should not vary more than 10% from
that stamped on the unit nameplate. On three phase
units, phases must be balanced within 3%.
3. For branch circuit wiring (main power supply to unit
disconnect), the minimum wire size for the length of
run can be determined from Table 6 using the circuit
ampacity found on the unit rating plate. Use the smallest
wire size allowable from the unit disconnect to the unit.
4. For through the base wiring entry, all ttings and conduit
are eld supplied for this application (Figure 14 on page
12). Reference Table 8 on page 13 for proper hole
and conduit size.
BRANCH
CIRCUIT
DISCONNECT
TO POWER
TO THERMOSTAT
Figure 13: Recommended Branch Circuit Disconnect
Location – Electric Heat or Cooling Only Units
TO POWER
BRANCH CIRCUIT DISCONNECT
TO CONTROL
Table 6: Branch Circuit Copper Wire Size
(Based on 1% Voltage Drop)*
Supply
Wire
Length
(ft.)
50 14 12 10 10 8 8 6 6
100 10 8 8 6 6 6 4 4
150 8 6 6 4 4 4 3 3
200 6 4 4 4 3 3 2 2
* Credit: National Electric Code
15 20 25 30 35 40 45 50
Branch Circuit Ampacity
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eleCTrICal InsTallaTIon
NOTE: Wire size based on 60°C rated wire insulation and
30°C ambient temp. (86°F).
For more than 3 conductors in a raceway or cable,
see the N.E.C. for derating the ampacity of each
con duct or.
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 70, if an external
electrical source is utilized.
Attach a length (6" or more) of recommended size copper wire
to the unit contactor terminals L1 and L3 for single phase, L1,
L2 and L3 for three phase.
Select the equivalent aluminum wire size from the tabulation
Table 7.
Table 7: Equivalent Aluminum Wire Size
AWG Copper
Wire Size
#12 #10 T & B Wire Nut PT2
#10 #8 T & B Wire Nut PT3
#8 #6 Sherman Split Bolt TSP6
#6 #4 Sherman Split Bolt TSP4
#4 #2 Sherman Split Bolt TSP2
AWG Aluminum
Wire Size
Connector Type and
Size (or equivalent)
Splice copper wire pigtails to aluminum wire with U.L.
recognized connectors for copper-aluminum splices. Please
exercise the following instructions very carefully to obtain a
positive and lasting connection:
1. Strip insulation from aluminum conductor.
2. Coat the stripped end of the aluminum wire with the
recommended inhibitor, and wire brush the aluminum
surface through inhibitor. INHIBITORS: Brundy-Pentex
“A”; Alcoa-No. 2EJC; T & B-KPOR Shield.
3. Clean and re-coat aluminum conductor with inhibitor.
4. Make the splice using the above listed wire nuts or split
bolt connectors.
5. Coat the entire connection with inhibitor and wrap with
electrical insulating tape.
Figure 14: Electrical Conduit Installation
IM 970-2 • MAVERICK I ROOFTOP 12 www.DaikinApplied.com
eleCTrICal InsTallaTIon
Table 8: Recommended Wire Sizes For Given Conduit and Hole Size
Wire Size,
AWG
Conduit
Size
Hole Size 7/8" 7/8" 7/8" 1-31/32" 1-23/64" 1-23/64" 1-23/32" 1-23/32" 1-31/32" 1-31/32" 2-15/32" 2-15/32"
14 12 10 8 6 4 3 2 1 0 00 000
1/2" 1/2" 1/2" 3/4" 1" 1" 1-1/4" 1-1/4" 1-1/2" 1-1/2" 2" 2"
Hook-Up
To wire unit, refer to the following hook-up diagram. Refer to
Figure 27 on page 29 and Figure 14 for location of wiring
entrances.
Wiring to be done in the eld between the unit and devices not
attached to the unit, or between separate devices which are
eld installed and located, shall conform with the temperature
limitation for Type T wire [63°F rise (35°C)] when installed in
accordance with the manufacturer’s instructions.
Internal Wiring
NOTICE
Some single phase units are equipped with a single pole contactor. Caution
must be exercised when servicing as only one leg of the power supply is
broken with the contactor.
Some models are equipped with electronically commutated
blower motors which are constantly energized, unless the main
unit disconnect is in the OFF position.
A diagram of the internal wiring of this unit is located under the
electrical box cover and this manual. If any of the original wire
as supplied with the unit must be replaced, the wire gauge and
insulation must be same as original wiring.
Transformer is factory wired for 230 volts on 208/230 volt
models and must be changed for 208 volt applications. See
unit wiring diagram for 208 volt wiring.
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eleCTrICal InsTallaTIon
Customer Supplied Thermostat
The customer supplied room thermostat must be compatible
with the spark ignition control on the unit. Generally, all
thermostats that are not of the “current robbing” type are
compatible with the integrated furnace control. The low voltage
wiring should be sized as shown in Table 9.
Table 9: Field Wire Size for 24 Volt Thermostat Circuits
Solid Copper Wire – AWG.
3.0
2.5
2.0
a. The total wire length is the distance from the furnace to the thermostat
and back to the furnace.
NOTE: Do not use control wiring smaller than No. 18 AWG.
16 14 12 10 10 10
16 14 12 12 12 10
18 16 14 12 12 10
50 100 150 200 250 300
Length of Run – Feeta
Install the room thermostat in accordance with the instruction
sheet packed in the box with the thermostat. See Figure 16 for
an example of a typical customer supplied wiring diagram.
Optional Factory Supplied
Thermostat
The optional factory supplied, touch screen, commercial
setback digital thermostat (Figure 15) uses microcomputer
technology to provide precise time and temperature control.
This thermostat offers the exibility to design heating and
cooling programs that t building needs (Table 10). This
thermostat is adaptable to most residential 24 volt forced air
multi-stage systems with electric or fossil fuel auxiliary and is
the ultimate for comfort, convenience, and performance. See
Figure 17 for an optional factory supplied thermostat wiring
diagram.
Table 10: Optional Factory Supplied Thermostat
Specications
Electrical Rating Single Stage:
Electrical Rating Staging: 20 to 30 V (ac), NEC Class II
Terminal Load: 1.5 A per terminal, 2.5 A max. combined
Setpoint Range: 45° to 99°F (7° to 37°C)
Anticipation, Heating: Adjustable
Anticipation, Cooling: Adjustable
Rated Differential Single Stage: Heat 0.6°F, Cool 1.2°F
Rated Differential Staging: Heat 0.6°F, Cool 1.2°F
Operating Ambient: 32° to +105°F (0° to +41°C)
Operating Humidity: 90% non-condensing max.
Shipping Temperature Range: -4° to 150°F (-20° to 65°C)
Dimensions (H × W × D): 4.6" × 5.9" × 1.2"
mV to 30 V (ac), NEC Class II, 50/60 Hz
or DC
Table 11: Thermostat Terminal Functions
Y2 2nd Stage Compressor
Y Compressor Relay
G Fan Relay
RC Power for Cooling
RH Power for Heating
Common wire from secondary side of cooling (Optional). Required for
C
fault indication, continuous backlight operation or remote temperature
sensor operation
L Malfunction indicator for systems with malfunction connection
W/E Heat Relay/Emergency Heat Relay (Stage 1)
W2 2nd Stage Heat (3rd Stage Heat in HP2)
Blank Blank
- Common (DC) for wired remote temperature sensor
S Frequency signal from remote temperature sensor
+ Power (DC) to remote temperature sensor
Figure 15: Optional Thermostat
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WIrIng dIagraMs
Figure 16: Typical Customer Supplied Thermostat Wiring Diagram
WIrIng dIagraMs
Figure 17: Optional Factory Supplied 7-170 Thermostat Wiring Diagram
Y2
Orange
Yellow
Green
Red
Brown
C Y1GW2W1R Y2
Terminal Block
+
S
-
W2
W/E
6
L
Black
Black
1. On 3 to 5 ton units, a terminal block is not supplied. Use a wirenut to extend from the leads provided in the unit to the
thermostat. W1, W2, and Y2 are optional depending upon the size and selected options of the unit. Colors shown above are
typical for the MPS I.
2. For wiring with DDC control option, see OM 1077 for wiring instructions.
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Figure 18: Wiring Diagram: MPS A03C to A04C, 208/230 Volt
WIrIng dIagraMs
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Figure 19: Wiring Diagram: MPS A03C to A04C, 460 Volt
WIrIng dIagraMs
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Figure 20: Wiring Diagram: MPS A03C to A04C with Gas Heat
WIrIng dIagraMs
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