Daikin MPS015 F, MPS017 F, MPS026 F, MPS020 F, MPS035 F Installation And Maintenance Manual
...
Installation and Maintenance Manual IM 1058-8
Group: Applied Air Systems
Part Number: IM 1058
Date: July 2017
Maverick® II
Commercial Packaged Rooftop Systems
Heating and Cooling
Models MPS015F – 0050F
15 to 50 Tons
R-410A Refrigerant
MicroTech® III Unit Controller
Energy Recovery Wheel
Table of ConTenTs
General Information ......................................3
Unit Nameplate......................................... 3
Hazard Identication Information ...........................3
Mechanical Installation ...................................4
Installer Responsibilities..................................4
Receiving Inspection ....................................4
Service Clearance ......................................4
Ventilation Clearance ....................................5
Overhead Clearance ....................................5
Roof Curb Assembly and Installation ........................5
Assembly Instructions ...................................6
Mechanical Installation .................................. 11
Rigging and Handling ...................................13
Condensate Drain Pipe Connection ........................15
Mechanical Installation ..................................15
Cabinet Weather Protection ..............................16
Installing Ductwork .....................................16
Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Field Power Wiring ....................................19
Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Preparing Unit for Operation..............................21
Spring Isolated Fans ...................................21
Optional Gas Heat ......................................22
Daikin Applied Tubular Heater Series
Package Heater Module.................................22
Gas Furnace Design ...................................23
Optional Gas Heat ......................................23
Installation ...........................................25
Optional Gas Heat ......................................27
Start-Up Procedures.................................... 32
Optional Electric Heat ...................................38
Electric Heater Design ..................................38
Optional Modulating Hot Gas Reheat.......................39
Modulating Hot Gas Reheat ..............................39
Optional Modulating Hot Gas Reheat.......................40
Optional Hot Water Heat .................................42
Hot Water Heater Design ................................42
Optional Energy Recovery Wheel..........................45
Energy Recovery Wheel Design ..........................45
Optional Outdoor Air Monitor .............................48
Thermal Dispersion Airow Measurement Technology..........48
Unit Options ...........................................53
Table of ConTenTs
Economizer Enthalpy Contro .............................53
External Time Clock ....................................53
Exhaust Fan Option ....................................53
Proof-of-Airow and Dirty Filter Switch...................... 53
Duct High Pressure Limit ................................53
Convenience Receptacle (Field Powered) ...................54
Convenience Receptacle (Unit Powered) ...................54
Condenser Fan Operation for Variable Speed Compressor
Low Ambient Option ....................................55
VFD Compressor Operation..............................56
Variable Speed Scroll Compressor.........................61
Wiring Diagrams........................................64
Sequence of Operation ..................................90
Operating States ......................................90
Mechanical Cooling ....................................91
Check, Test, and Start Procedures.........................92
Pre-Start of Unit .......................................92
Servicing Control Panel Components ......................92
Energy Recovery Wheel................................. 96
Final Control Settings ...................................97
Controller Settings for Normal Operation ....................97
Maintenance ...........................................98
Performing Service Maintenance ..........................98
Control Panel Components .............................102
Unit Storage .........................................105
Bearing Lubrication ...................................106
Energy Recovery Wheel................................ 107
Segment Installation & Replacement ......................109
Wheel Drive Motor & Pulley Replacement ..................109
Belt Replacement ..................................... 11 0
Troubleshooting ...................................... 110
Supply Fan .......................................... 111
Refrigerant Charge.................................... 111
Servicing Optional Electric Heater ........................ 111
Service and Warranty Procedure .........................112
Replacement Parts.................................... 112
Compressors ........................................ 112
In-Warranty Return Material Procedure .................... 112
Warranty Registration Form .............................113
Quality Assurance Survey Report ........................119
Appendix – Keypad/Display Menu Structure................120
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS 2 www.DaikinApplied.com
General InformaTIon
This manual provides general information about the “F”
vintage Daikin Commercial Packaged Rooftop Unit model
MPS. In addition to an overall description of the unit, it
includes mechanical and electrical installation procedures,
commissioning procedures, sequence of operation information,
and maintenance instructions.
The MicroTech® III rooftop unit controller is available on
“F” vintage rooftop units. For a detailed description of the
MicroTech III components, input/output congurations, eld
wiring options and requirements, and service procedures,
see OM 920. 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: Program Specic Unit Operation Literature
Rooftop unit control conguration Manual bulletin number
OM 844 - MD2
VFDs
MPS Unit Controller
Discharge Air Control (VAV or CAV)
Space Comfort Control (SCC)
LonWorks Integration IM 918
BACnet Integration IM 917
BACnet IP Comm Module IM 916
OM 895 - MD3
OM 1190 - MD4
OM 1191 - MD5
OM 847 - MD6
OM 920
General InformaTIon
Unit Nameplate
The unit nameplate is located on the outside of the main
control box door. It includes the unit model number, serial
number, electrical characteristics, and refrigerant charge.
Hazard Identication Information
DANGER
Dangers indicate a hazardous situation which will result in
death or serious injury if not avoided.
WARNING
Warnings indicate potentially hazardous situations, which can
result in property damage, severe personal injury, or death if
not avoided.
CAUTION
Cautions indicate potentially hazardous situations, which can
result in personal injury or equipment damage if not avoided.
Nomenclature (MPS 015–050)
Daikin Packaged System
Nominal capacity (tons)
M P S – 015 – F G A
A = Standard DX Rows
B= Extra DX Rows
Heat medium
Y = None (cooling only)
G = Natural gas
E = Electric heat
W = Hot water heat
Design vintage
• 15F
• 20/26G
• 30–50 F
www.DaikinApplied.com 3 IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS
Installer Responsibilities
The installation of this equipment shall be in accordance
with the regulations of authorities having jurisdiction and all
applicable codes. It is the responsibility of the installer to
determine and follow the applicable codes.
CAUTION
Sharp edges on sheet metal and fasteners can cause
personal injury. This equipment must be installed, operated,
and serviced only by an experienced installation company and
fully trained personnel.
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Receiving Inspection
When the equipment is received, all items should be carefully
checked against the bill of lading to be sure all crates and
cartons have been received. If the unit has become dirty
during shipment (winter road chemicals are of particular
concern), clean it when received.
All units should be carefully inspected for damage when
received. Report all shipping damage to the carrier and le a
claim. In most cases, equipment is shipped F.O.B. factory and
claims for freight damage should be led by the consignee.
Before unloading the unit, check the unit nameplate to make
sure the voltage complies with the power supply available.
Service Clearance
Allow service clearances as approximately indicated in Figure
1. Also, Daikin recommends providing a roof walkway to the
rooftop unit as well as along each side of the unit that provides
access to most controls and serviceable components.
Figure 1: Service Clearances
Optional
Energy Recovery Wheel (ERW)
Assembly
60.00
(1524 mm)
B
60.00
(1524 mm)
Evaporator/
Hot Gas Reheat Coil
Fan
Assembly
(removal from
this side only)
96.00
(2438 mm)
15-50 Ton
Optional Hot
Water Heat
(removal from
this side only*)
Optional Gas Furnace
or Electric Heat
* 61-75 Ton
Fan and Gas/Electric/Hot Water
Heaters can be removed from
either side
A
Optional
Energy Recovery Wheel
Exhaust Air Fan Assembly
15-50 Ton 61-75 Ton
A = 72 (1828 mm) 60 (1524 mm)
B = 60 (1524 mm) 72 (1828 mm)
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS 4 www.DaikinApplied.com
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Ventilation Clearance
Below are minimum ventilation clearance recommendations.
The system designer must consider each application and
provide adequate ventilation. If this is not done, the unit may
not perform properly.
Unit(s) Surrounded by a Screen or a Fence:
1. The bottom of the screen or fence should be at least 1 ft.
(305 mm) above the roof surface.
2. The distance between the unit and a screen or fence
should be as described in Figure 1.
3. The distance between any two units within a screen or
fence should be at least 120" (3048 mm).
Unit(s) Surrounded by Solid Walls:
1. If there are walls on one or two adjacent sides of the unit,
the walls may be any height. If there are walls on more
than two adjacent sides of the unit, the walls should not
be higher than the unit.
2. The distance between the unit and the wall should be at
least 96" (2438 mm) on all sides of the unit.
3. The distance between any two units within the walls
should be at least 120" (3048 mm).
Do not locate outside air intakes near sources of
contaminated air.
If the unit is installed where windy conditions are common,
install wind screens around the unit, maintaining the
clearances specied (see Figure 1). This is particularly
important to maintain adequate head pressure control when
mechanical cooling is required at low outdoor air temperatures.
NOTE: Low head pressure may lead to poor and erratic
refrigerant feed control at the thermostatic expansion
valve. The unit has automatic control of the
condenser fans which should provide adequate head
pressure control down to 20°F provided the unit is not
exposed to windy conditions. The system designer is
responsible for assuring the condensing section is not
exposed to excessive wind or air recirculation.
Overhead Clearance
1. Unit(s) surrounded by screens or solid walls must have
no overhead obstructions over any part of the unit.
2. The area above the condenser must be unobstructed in
all installations to allow vertical air discharge.
3. The following restrictions must be observed for overhead
obstructions above the air handler section:
a. There must be no overhead obstructions above the
furnace ue, or within 9" (229 mm) of the ue box.
b. Overhead obstructions must be no less than 96"
(2438 mm) above the top of the unit.
c. There must be no overhead obstructions in the
areas above the outside air and exhaust dampers
that are farther than 24" (610 mm) from the side of
the unit.
Roof Curb Assembly and Installation
Locate the roof curb and unit on a portion of the roof that can
support the weight of the unit. The unit must be supported to
prevent bending or twisting of the machine.
If building construction allows sound and vibration into the
occupied space, locate the unit over a non-critical area. It is
the responsibility of the system designer to make adequate
provisions for noise and vibration in the occupied space.
WARNING
Mold can cause personal injury. Some materials such as
gypsum wall board can promote mold growth when damp.
Such materials must be protected from moisture that can
enter units during maintenance or normal operation.
Install the curb and unit level to allow the condensate drain to
ow properly and allow service access doors to open and close
without binding.
The gasketed top surface of the curb seals against the unit
when it is set on the curb. These anges must not support
the total weight of the duct work. See Installing Ductwork on
page 16 for details on duct connections. It is critical that
the condensate drain side of the unit be no higher than the
opposite side.
www.DaikinApplied.com 5 IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS
Assembly Instructions
Assembly of a typical roof curb is shown in Figure 2.
1. Set curbing parts A thru G per dimensions shown over
roof opening or on a level surface. Note location of
supply air opening. Check alignment of all mating screw
holes.
2. Screw curbing parts together using fasteners provided.
Leave all screws loose until curb is checked to be square.
3. Square entire curbing assembly and securely tighten all
screws.
Figure 2: Roof Curb Assembly (MPS 026G – 035F Example)
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4. Position curb assembly over roof openings. Curb must
be level within 0.25 inches from side to side and 1.50
inches over its length. Check that top surface of curb is
at with no bowing or sagging.
5. Weld curb assembly in place. Caulk all seams watertight.
Remove backing from 0.25 × 1.50 wide gasket and apply
to surfaces shown by crosshatching.
6. Check that electrical connections are coordinated.
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS 6 www.DaikinApplied.com
Figure 3: Roof Curb Layout—MPS 015F – 020G
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www.DaikinApplied.com 7 IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS
Figure 4: Roof Curb Layout—MPS 026G – 035F
2.00
[51 mm]
2.00
[51 mm]
23.50
[597 mm]
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21.25
[540 mm]
87.25
[2216 mm]
(INSIDE CURB)
2.00
[51 mm]
1.25
[32 mm] TYP
63.69
[1610 mm]
1.63
[41 mm]
93.70
[2380 mm]
171.18 (INSIDE CURB)
[4348 mm]
PLAN VIEW
HOT WATER
ONLY
CHASE
1.00
[25 mm]
19.00
[483 mm]
71.38
[1813 mm]
15.87
[403 mm]
2.00
[51 mm]
1.00
[26 mm]
1.00
[26 mm]
2.00
[51 mm]
0.38
[9.7 mm]
23.86
[606 mm]
3.75
[95 mm]
0.38
[9.7 mm]
F
KNOCKOUT DETAIL
CURB CROSS SECTION
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS 8 www.DaikinApplied.com
Figure 5: Roof Curb Layout—MPS 040F – 050F
2.00
[51 mm]
2.00
[51 mm]
87.25
[2216 mm]
(INSIDE CURB)
30.63
[778 mm]
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28.25
[718 mm]
71.38
[1813 mm]
2.00
[51 mm]
1.00
[25 mm]
2.00
[51 mm]
1.25 TYP
[32 mm]
2.00
[51 mm]
0.38
[9.7 mm]
28.92
[735 mm]
69.39
[1763 mm]
3.75
[95 mm]
1.63
[41 mm]
105.45
[2678 mm]
208.57 (INSIDE CURB)
[5298 mm]
PLAN VIEW
0.38
[9.7 mm]
HOT WATER
ONLY
CHASE
1.00
[25 mm]
26.00
[660 mm]
15.87
[403 mm]
F
CURB CROSS SECTION
www.DaikinApplied.com 9 IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS
Figure 6: MPS 015–020 Roof Curb with Energy Recovery Wheel
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IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS 10 www.DaikinApplied.com
Figure 7: MPS 026–035 Roof Curb with Energy Recovery Wheel
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Figure 8: MPS 040–050 Roof Curb with Energy Recovery Wheel
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IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS 12 www.DaikinApplied.com
Rigging and Handling
WARNING
Only trained and qualied personnel should be allowed to rig
loads or operate load rated cranes and/or hoist assemblies.
Do not use a forklift to lift or maneuver the unit. Failure to use
a load rated crane or hoist assembly to lift or maneuver the
unit can cause severe personal injury and property damage.
WARNING
Use all lifting points. Improper lifting can cause property
damage, severe pers al injury, or death.
CAUTION
Lifting points may not be symmetrical to the center of gravity
of the unit. Ballast or unequal cable lengths may be required.
Rigging holes for shackles are integral on the unit base. All
six lifting points must be used for rigging the equipment.
Use four independent lines, securing one end of a line
to a unit base lifting point and the other end of the line
to an associated spreader bar lifting point (see Figure 10
and Figure 11). Figure 9 is an example of an instruction label
shipped with each unit.
Figure 9: Rigging Label
LIFT UNIT ONLYAS SHOWN
SPREADER BARS REQUIRED
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Use spreader bars, 96" to 100" (2438 to 2540 mm) wide to
prevent damage to the unit cabinet. Avoid twisting or uneven
lifting of the unit. The cable length from the bracket to the hook
should always be longer than the distance between the outer
lifting points.
If the unit is stored at the construction site for an intermediate
period, take these additional precautions:
1. Support the unit well along the length of the base rail.
2. Level the unit (no twists or uneven ground surface).
3. Provide proper drainage around the unit to prevent
ooding of the equipment.
4. Provide adequate protection from vandalism, mechanical
contact, etc.
5. Securely close the doors.
6. Cover the supply and return air openings.
Table 4 and Table 5 lists the weight distribution at each of the
lifting points on the unit (refer to Figure 10 and Figure 11). Table
6 details lifting point locations. Table 7 through Table 12 lists the
weights of unit curbs and other sections of the unit.
Table 2: Unit Base Weights
Unit (Tons) Total Weight (lbs)
015 2655
017 2705
020 3610
026 3610
030 3610
035 3660
040 4685
050 4985
Table 3: Unit Curb Weights
Unit (tons) Curb Height (inches) Total Weight (lbs)
Standard Unit
MUST USE ALL OF THESE
LIFTING LUGS FOR LIFTING UNIT.
015–035
040–050
Unit with Energy Wheel
015–035
040–050
14 341
24 504
14 461
24 706
14 458
24 674
14 619
24 908
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Table 4: Weight Distribution Locations (see Figure 10)
Unit
(tons)
040–050 42.2 66.6 58.3 60.9
L1 L2 L3 L4
Distance
Table 5: Weight Distribution Locations (see Figure 11)
Unit
(tons)
015–035 35.5 62.0 52.0
040–050 40.0 69.0 89.0
L1 L2 L3
Distance
Table 6: Weight Distribution — Energy Wheel
Point
Unit
A B C D E F G H
015–050 without Energy Wheel 11% 11% 20% 24% 16% 18% N/A N/A
015–035 with Energy Wheel 13% 12% 20% 21% 17% 17% N/A N/A
040–050 with Energy Wheel 12% 12% 13% 13% 12% 12% 13% 13%
Table 7: Heat Section Weights
Unit
(tons)
015 200 100 120 195
017 200 100 120 195
020 200 100 120 195
026 270 135 270 291
030 270 135 270 291
035 270 135 270 291
040 350 175 350 307
050 350 175 350 307
High Gas
Heat
Weights (lbs)
Low Gas
Heat
Electric
Heat
Hot Water
Heat
Table 10: Additional Weights - Motors/Exhaust Fans
(015–020)
Table 11: Additional Weights - Motors/Exhaust Fans
(026–050)
Table 8: Curb Weights
Unit (tons)/
Curb Height (inches)
015–035/14 341 458
015–035/24 501 674
040–050/14 481 619
040–050/24 708 908
without ERW with ERW
Table 9: Energy Recovery Section Weights
Unit Size (tons) Weight (lbs)
015–020 1200
026–035 1540
040–050 1000
Weight (lbs)
Table 12: Additional Weights for 6-Row DX Coil and HGRH
Coil
Percent of total
HP
1 0 15–20 150
1.5 9
2 9
3 32
5 43
HP
7.5 0 26 150
10 25 30 150
15 125 35 150
20 175 40 200
25 225 50 200
30 275
Additional Motor
Weight (lbs)
Additional Motor
Weight (lbs)
Unit Size
(tons)
15–20 11 8 70
26–35 164 82
40 187 92
50 231 92
6 Row DX HGRH
Unit
(tons)
Unit (tons)
Weight (lbs)
Additional Exhaust
Fan Weight (lbs)
Additional Exhaust
Fan Weight (lbs)
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS 14 www.DaikinApplied.com
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Figure 10: Rigging the Unit (MPS 026– 035 Example)
Figure 11: Rigging the Unit (MPS 040–050 Example)
G
E
A
C
Condensate Drain Pipe Connection
The unit is provided with a 1" male NPT condensate drain
connection. For proper drainage, level the unit and drain pan
side to side and install a P-trap.
Figure 12 shows the layout of the condensate drain
connection. The distance from the drain pan outlet to the
horizontal run of the P-trap should be a distance of twice the
static pressure in the drain pan.
Example: If the static pressure as measured in the drain pan
is 1.5", then the distance between the drain outlet and the
horizontal run should be 3".
Draining condensate directly onto the roof may be acceptable;
refer to local codes. Provide a small drip pad of stone, mortar,
wood, or metal to protect the roof against possible damage.
If condensate is piped into the building drainage system, pitch
the drain line away from the unit a minimum of 1/8" per foot.
The drain line must penetrate the roof external to the unit.
Refer to local codes for additional requirements. Sealed drain
lines require venting to provide proper condensate ow.
Where the cooling coils have intermediate condensate pans on
the face of the evaporator coil, copper tubes near both ends of
the coil supply drainage to the main drain pan. Verify the tubes
are in place and open before putting the unit into operation.
Periodically clean to prevent microbial growth/algae buildup
from plugging the drain and causing the drain pan to overow.
Clean drain pans to prevent the spread of disease. Cleaning
should be performed by qualied personnel.
H
F
D
B
L2
L1
L3
L4
Drain pans must be cleaned periodically. Material in uncleaned
drain pans can cause disease. Cleaning should be performed
by qualied personnel.
Figure 12: Condensate Drain Connection
WARNING
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Damper Assemblies
The optional damper assemblies described in this section
are ordered with factory-installed actuators and linkages.
The following sections describe the operation and linkage
adjustment of the factory option.
Figure 13: Damper Assembly
Linkage
Actuator
Economizer Dampers
As the single actuator modulates, the outside air dampers
open, the return air dampers close, and the exhaust air exits
the unit through the gravity relief dampers.
The economizer comes with manually adjustable linkage
(Figure 13). The damper is set so that the crankarm moves
through a 90-degree angle to bring the economizer dampers
from full open to full close. Mechanical stops are placed in the
crankarm mounting bracket. Do not remove stops. Driving the
crankarm past the stops results in damage to the linkage or
damper.
Outdoor Air Dampers (0% to 30%)
These dampers are intended to remain at a xed position during
unit operation, providing fresh air quantities from 0 to 30% of the
total system airow, depending on the damper setting.
The damper position may be set at the unit controller keypad
(refer to OM 920 for further detail). During unit operation, the
damper is driven to the position set at the unit controller. During
the off cycle, the damper is automatically closed.
Cabinet Weather Protection
This unit ships from the factory with fully gasketed access
doors and cabinet caulking to provide weather resistant
operation. After the unit is set in place, inspect all door gaskets
for shipping damage and replace if necessary.
Protect the unit from overhead runoff from overhangs or other
such structures.
CAUTION
Transportation, rigging, or maintenance can damage the
unit’s weather seal. Periodically inspect the unit for leakage.
Standing moisture can promote microbial growth, disease, or
damage to the equipment and building
Installing Ductwork
On vertical-supply/vertical-return units, if a Daikin roof curb
is not used, the installing contractor should make an airtight
connection by attaching eld fabricated duct collars to the
bottom surface of the unit’s duct opening. Do not support
the total weight of the duct work from the unit. See roof curb
layouts in Figure 3 on page 7, Figure 4 on page 8 or
Figure 5 on page 9.
Table 13: Rated Airow
Unit Size (tons) AHRI Rated Airow
015 3750
017 4375
020 5000
026 6875
030 7500
035 8750
040 10000
050 12500
Use exible connections between the unit and ductwork to
avoid transmission of vibration from the unit to the structure.
To minimize losses and sound transmission, design duct work
per ASHRAE and SMACNA recommendations.
Where return air ducts are not required, connect a sound
absorbing T or L section to the unit return to reduce noise
transmission to the occupied space.
Ductwork exposed to outdoor conditions must be built in
accordance with ASHRAE and SMACNA recommendations
and local building codes.
WARNING
Mold can cause personal injury. Materials such as gypsum
wall board can promote mold growth when damp. Such
materials must be protected from moisture that can enter units
during maintenance or normal operation.
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS 16 www.DaikinApplied.com
Main Control Panel Condenser Section
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Installing Duct Static Pressure Sensor
Taps
For all VAV units, duct static pressure taps must be eld
installed and connected to the static pressure sensor 1 (SPS1)
in the unit. Sensor SPS1 is standard on VAV units and is
located in the main control panel.
Carefully locate and install the duct static pressure sensing
tap. Improperly locating or installing the sensing tap causes
unsatisfactory operation of the entire variable air volume
system. Below are pressure tap location and installation
recommendations. The installation must comply with local code
requirements.
1. Install a tee tting with a leak-tight removable cap in each
tube near the sensor tting. This facilitates connecting a
manometer or pressure gauge if testing is required.
2. Use different colored tubing for the duct pressure (HI)
and reference pressure (LO) taps, or tag the tubes.
Daikin recommends 3/16" ID tubing.
3. Locate the duct pressure (HI) tap near the end of a long
duct to ensure that all terminal box take-offs along the
run have adequate static pressure.
4. Locate the duct tap in a nonturbulent ow area of the
duct. Keep it several duct diameters away from take-off
points, bends, neckdowns, attenuators, vanes, or other
irregularities.
5. Use a static pressure tip (Dwyer A302 or equivalent) or
the bare end of the plastic tubing for the duct tap. (If the
duct is lined inside, use a static pressure tip device.)
6. Install the duct tap so that it senses only static pressure
(not velocity pressure). If a bare tube end is used,
it must be smooth, square (not cut at an angle) and
perpendicular to the airstream (see Figure 15).
7. Locate the reference pressure (LO) tap near the duct
pressure tap within the building. If the tap is not connected
to the sensor, unsatisfactory operation will result.
8. Route the tubes through the curb and feed them into the
unit through the knockout in the bottom of the control
panel (see Figure 14). Connect the tubes to appropriate
barbed ttings (on SPS1) in the control panel. (Fittings
are sized to accept 3/16" ID tubing.)
Figure 14: Static Pressure Tubing Knockout Location
Figure 15: Duct Static Pressure Sensing Tubing
Installation
HI Line
LO Line
Remote Sense Point
To Sensor
LO Input
To Sensor
HI Input
Pressure Sensing
Tubing
SPS1
Rubber
Grommet
Roof
Ductwork
(Remote Location)
Tubing Extends
Through Approx. 1/8”
www.DaikinApplied.com 17 IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS
meChanICal InsTallaTIon
Installing Building Static Pressure
Sensor Taps
If a unit has building static pressure control capability, you
must eld install and connect static pressure taps to the static
pressure sensor SPS2 in the unit. This sensor is located at the
bottom of the main control panel next to SPS1.
Carefully locate and install the two static pressure sensing
taps. Improper location or installation of the sensor taps causes
unsatisfactory operation. Below are pressure tap location and
installation recommendations for both building envelope and
lab, or “space within a space” pressure control applications.
The installation must comply with local code requirements.
CAUTION
Fragile sensor ttings. If you must remove tubing from a
pressure sensor tting, use care. Do not use excessive force
or wrench the tubing back and forth to remove or the tting
can break off and damage sensor.
Building Pressurization Applications
1. Install a tee tting with a leak-tight removable cap in each
tube near the sensor tting. This facilitates connecting a
manometer or pressure gauge if testing is required.
2. Locate the building pressure (high) tap in the area that
requires the closest control. Typically, this is a ground
level oor that has doors to the outside.
3. Locate the building tap so it is not inuenced by any
source of moving air (velocity pressure). These sources
may include air diffusers or outside doors.
4. Route the building tap tube through the curb and feed
it into the unit through the knockout in the bottom of the
control panel (refer to Figure 14). Connect the 3/16" ID
tube to the (high) tting for sensor SPS2.
5. Locate the reference pressure (low) tap on the roof.
Keep it away from the condenser fans, walls, or anything
else that may cause air turbulence. Mount it high
enough above the roof so it is not affected by snow. Not
connecting the reference tap to the sensor results in
unsatisfactory operation.
6. Use an outdoor static pressure tip (Dwyer A306 or
equivalent) to minimize the adverse effects of wind.
Place some type of screen over the sensor to keep out
insects. Loosely packed cotton works well.
7. Route the outdoor tap tube out of the main control panel
through a small eld-cut opening in the upright. Seal the
penetration to prevent water from entering. Connect the
3/16" ID tube to the (low) tting for sensor SPS2.
Figure 16: Outdoor Static Pressure Tubing Installation
Lab Pressurization Applications
1. Install a “T” tting with a leak-tight removable cap in each
tube near the sensor tting. This facilitates connecting a
manometer or pressure gauge if testing is required.
2. Use different colored tubing for the controlled space
pressure (high) and reference pressure (low) taps, or tag
the tubes.
3. Regardless whether the controlled space is positive or
negative with respect to its reference, locate the high
pressure tap in the controlled space (the setpoint can be
set between -0.2" and 0.2" wc).
4. Locate the reference pressure (low) tap in the area
surrounding the controlled space. Not locating the
reference tap to the sensor results in unsatisfactory
operation.
5. Locate both taps so they are not inuenced by any
source of moving air (velocity pressure). These sources
may include air diffusers or doors between the high and
low pressure areas.
6. Route the building tap tube between the curb and the
supply duct and feed it into the unit through the knockout
in the bottom of the control panel.
7. Connect the tube to the (high) tting for sensor SPS2.
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS 18 www.DaikinApplied.com
Field Power Wiring
Wiring must comply with all applicable codes and ordinances.
The warranty is voided if wiring is not in accordance with these
specications.
According to the National Electrical Code, a disconnecting
means shall be located within sight of and readily accessible
from the air conditioning equipment. The unit can be ordered
with an optional factory mounted disconnect switch. This switch
is not fused. Power leads must be over-current protected at the
point of distribution. The maximum rated overcurrent protection
device (MROPD) value appears on the unit nameplate.
All Units
All units are provided with internal power wiring for single point
power connection. The power block or an optional disconnect
switch is located within the main control panel. Field power
leads are brought into the unit through knockouts in the bottom
of the main control panel (see Figure 17 and also Table 14).
Refer to the unit nameplate to determine the number of power
connections.
NOTE: To wire entry points, refer to certied drawings for
dimensions.
WARNING
Hazardous voltage. Can cause severe injury or death.
Disconnect electric power before servicing equipment. More
than one disconnect may be required to de-energize the unit.
The preferred entrance for power cables is through the bottom
knockouts provided on the unit. If a side entrance is the only
option, a hole may be drilled in the stationary upright.
The minimum circuit ampacity (MCA) is shown on the unit
nameplate. Refer to Table 14 for the recommended number of
power wires.
Copper wire is required for all conductors. Size wires in
accordance with the ampacity tables in Article 310 of the
National Electrical Code. If long wires are required, it may
be necessary to increase the wire size to prevent excessive
voltage drop. Wires should be sized for a maximum of 3%
voltage drop. Supply voltage must not vary by more than 10%
of nameplate. Phase voltage imbalance must not exceed 2%.
(Calculate the average voltage of the three legs. The leg with
voltage deviating the farthest from the average value must not
be more than 2% away.) Contact the local power company for
correction of improper voltage or phase imbalance.
eleCTrICal InsTallaTIon
eleCTrICal InsTallaTIon
A ground lug is provided in the control panel. Size the
grounding conductor in accordance with Table 250-95 of the
National Electrical Code.
In compliance with the National Electrical Code, a 115 V
factory mounted service receptacle outlet is provided. This
outlet must be powered by a eld connected 15 A, 115 V power
supply. Leads are brought into the unit through a 7/8" knockout
in the bottom of the main control panel.
Table 14: Recommended Field Power Wiring
Ampacity (MCA)
20 1 14 75
25 1 12 75
35 1 10 75
50 1 8 75
65 1 6 75
85 1 4 75
100 1 3 75
115 1 2 75
130 1 1 75
150 1 1/0 75
175 1 2/0 75
200 1 3/0 75
230 1 4/0 75
255 1 250 75
300 2 1/0 75
350 2 2/0 75
400 2 3/0 75
460 2 4/0 75
510 2 250 75
600 3 3/0 75
690 3 4/0 75
765 3 250 75
Notes:
1. All wire sizes assume separate conduit for each set of parallel conductors.
2. All wire sizes based on NEC Table 310-16 for 75°C THW wire (copper). Canadian electri-
cal code wire ampacities may vary.
3. All wire sizes assume no voltage drop for short power leads.
No. of Power
Wires per Phase
Wire Gauge
Figure 17: MPS Power Wiring Knockout Locations
Insulation
Temperature
Rating (°C)
CAUTION
Provide proper line voltage and phase balance. Improper line
voltage or excessive phase imbalance constitutes product
abuse. It can cause severe damage to the unit's electrical
components.
www.DaikinApplied.com 19 IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS
Field Control Wiring
The Maverick rooftop units are available with the following eld
control connections:
• Space sensor.
• Space sensor with setpoint adjustment.
• Fan operation output.
• VAV box output.
• Remote alarm output.
• External discharge air temperature reset.
• Outdoor air damper minimum position adjustment.
eleCTrICal InsTallaTIon
eleCTrICal InsTallaTIon
Descriptions of these eld connections are included in the
MicroTech III Unit Controller manual (OM 920).
WARNING
Electrical shock hazard. Can cause severe injury or death.
Connect only low voltage NEC Class II circuits to terminal
block TB2.
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS 20 www.DaikinApplied.com
Spring Isolated Fans
WARNING
Moving machinery hazard. Can cause severe injury ordeath.
Before servicing equipment, disconnect power and lockoff.
More than one disconnect may be required to de-energizeunit.
Prior to operating the fans for the rst time, refer to Check,
Test, and Start Procedures on page 92.
Releasing Spring Mounts
The spring-mounted supply fan is locked down with four
shipping bolts for shipment. Remove each shipping bolt before
operating the fans. Figure 18 shows a typical spring mount
with a height adjustment nut and a shipping bolt.After removing
the shipping bolts, rock the fan assembly by hand to check for
freedom of movement.
Adjusting Spring Mounts
During operation all fans should ride level. Level the fan
assembly by performing the following:
1. Loosen the 3/8" cap screw (do not remove).
2. Loosen the spring cap nut.
3. Rotate the 5/8" adjustment nut counter-clockwise to raise
the fan assembly, or clockwise to lower the fan assembly.
4. Tighten the 3/8" cap screw.
5. Tighten the spring cap nut.
PreParInG UnIT for oPeraTIon
PreParInG UnIT for oPeraTIon
Figure 18: Spring Mounts
www.DaikinApplied.com 21 IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS
Daikin Applied Tubular Heater Series Package Heater Module
oPTIonal Gas heaT
oPTIonal Gas heaT
ANSI Z83.8-2013/CSA 2.6-2013
DANGER
FIRE OR EXPLOSION HAZARD
• Failure to follow safety warnings exactly could result in
serious injury, death or property damage.
• Be sure to read and understand the installation,
operation and service instructions in this manual.
• Improper installation, adjustment alteration, service
or maintenance can cause serious injury, death or
property damages.
• Do not store or use gasoline or other ammable vapors
and liquids in the vicinity of this or any other appliance.
• WHAT TO DO IF YOU SMELL GAS
— Do not try to light any appliance.
— Do not touch any electrical switch; do not use any
phone in your building.
— Leave the building immediately.
— Immediately call you gas supplier. Follow the gas
supplier’s instructions.
— If you cannot reach your gas supplier, call the re
department.
• Installation and service must be performed by a
qualied installer, service agency or the gas supplier.
DAT heater series modules are a recognized furnace
component is design certied by intertek testing services
(ETL) for outdoor installation and installation downstream from
refrigeration systems in cabinet applications.
This furnace must be installed in the designated noncombustible heat chamber of the cabinet. If it is removed, it
is only to be replaced with an approved Original Manufacture
Equipment Supplier furnace(s), installed and operated as
specied by the approved Original Manufacture Equipment
Supplier. It is not designed to have any portion of the heat
exchanger outside the cabinet in which the furnace module is
housed.
The Rating Plate/Name Plate has been permanently attached
to the furnace assembly. It contains information including gas
type, maximum and minimum input rating, manifold pressure,
maximum and minimum inlet gas pressure, maximum and
minimum airow requirements, output capacity and electrical
rating for the furnace. The plate also includes model number,
serial number and scan code. This plate is to always remain
attached to the furnace.
This furnace must be applied in accordance with the
requirements of its listing.
Hooded and screened openings for combustion air have been
provided in the furnace(s) access door. The air opening provides
unrestricted combustion air to the burners and sized such that
a minimum free area is maintained. The minimum free area is
dened as 1 in2 (625mm2) per 4000 BTUH (2.345 kW).
The access door provides direct access to the furnace
vestibule where the burners, combustion inducer fan, ignition
controls and ignition safeties are housed.
The vent discharge is sized such that it is equal to or larger
than the discharge area of the combustion exhaust inducer fan.
A non-adjustable High Limit Switch will shut off the gas supply
to the main burners should the outlet air reach a temperature
exceed 250°F (121°C).
The cabinet supply air ow delivery package has been
designed to provide sufciently well distributed air ow across
the heat exchanger to limit temperature rise as follows:
• Aluminized Steel: 1030°F (575°C)
• 409 Stainless Steel: 1080°F (600°C)
Clearance from combustibles to be no less than as listed
below:
• Sides and back .....................6 in. (152 mm)
• Bottom .............................2 in. (51 mm)
• Top ............................... 6 in. (152 mm)
• Front.............................36 in. (914 mm)
• Vent pipe to any combustible surface .... 6 in. (152 mm)
Do not use this package heater if any part has been under
water. Immediately call a qualied service technician to inspect
the heater and any gas control which has been under water.
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS 22 www.DaikinApplied.com
Gas Furnace Design
If the 8th digit in the model number is a “G”, the rooftop unit
was furnished with a factory installed furnace (Example,
MPS035FG). The Maverick commercial rooftop units are
available with either the low heat input or the high heat input
furnace (see capacities in Table 15). This packaged gas heat
rooftop unit is designed for outdoor non-residential installations
only.
The gas heat furnace design consists of a tubular heat
exchanger, in-shot burner manifold with gas valve, induced
combustion blower, gas heat DDC control module and all
operational safeties. The tubular heat exchanger can come
with the standard aluminized steel construction or the optional
stainless steel construction. The safety switches include a
high-limit temperature switch, an auxiliary high-limit switch,
a combustion blower proof of airow, and the ame roll-out
switch (see Figure 20).
The high limit switch is an automatic reset switch and it opens
up at 160°F to shut the furnace down and closes at 130°F. The
auxiliary limit switch is a manual reset and opens up at 180°F
to shut the furnace down.
Figure 19: Gas Heat Section
Field Gas
Piping
oPTIonal Gas heaT
oPTIonal Gas heaT
Gas Heating Capacity Data
Table 15: MPS 015F – 050F Gas Heating Capacities
Unit Size
Data
Low Heat High Heat Low Heat High Heat Low Heat High Heat
Heating Input (MBh) 240 480 300 600 400 800
Heating Output (MBh) 192 384 240 480 320 640
Steady State Efciency 80% 80% 80% 80% 80% 80%
Number of Stages 2 4 2 4 2 4
Turndown
Minimum Airow 2960 5920 3700 7400 4900 9800
Maximum Temperature Rise 60°F 100°F 60°F 85°F 60°F 85°F
Gas Main Pressure
Natural Gas (in. wc) 7-14 7-14 7-14 7-14 7-14 7-14
Liquid Propane (in. wc) 12-14 12-14 12-14 12-14 12-14 12-14
Manifold Pressure
Natural Gas (per gas valve)
Stage 1 (in. wc) 1.2 1.2 1.2 1.2 1.2 1.2
Stage 2 (in. wc) 3.2 3.2 3.2 3.2 3.2 3.2
Propane
Stage 1 (in. wc) 2.3 2.3 2.3 2.3 2.3 2.3
Stage 2 (in. wc) 10.0 10.0 10.0 10.0 10.0 10.0
Note:
1 Modulating gas heat only.
2 Modulating gas heat not available with propane.
Low re
Low re
1
2
2
015–020 026–035 040–050
4:1 8:1 4:1 8:1 4:1 8:1
0.4 0.4 0.4 0.4 0.4 0.4
N/A
www.DaikinApplied.com 23 IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS
Figure 20: Staged Furnace Assembly
oPTIonal Gas heaT
Warranty Exclusion
Warranty is void if the furnace is operated in the presence of
chlorinated vapors, if the airow through the furnace is not in
accordance with rating plate, or if the wiring or controls have
been modied or tampered with.
WARNING
Hot surface hazard. Can cause severe equipment damage,
personal injury, or death. Allow burner assembly to cool
before servicing equipment.
WARNING
Units equipped with gas heating must not be operated
in an atmosphere contaminated with chemicals which
will corrode the unit such as halogenated hydrocarbons,
chlorine, cleaning solvents, refrigerants, swimming pool
exhaust, etc. Exposure to these compounds may cause
severe damage to the gas furnace and result in improper
or dangerous operation. Operation of the gas furnace in
such a contaminated atmosphere constitutes product abuse
and will void all warranty coverage by the manufacturer.
Questions regarding specic contaminants should be referred
to your local gas utility.
Ventilation & Flue Pipe Requirements
The Daikin rooftop unit is equipped with an outdoor air hood
to supply adequate combustion air. The unit also has a ue
outlet assembly and requires no additional chimney, ue pipe,
Breidert cap, draft inducer, etc.
Factory Checkout
This complete furnace was red and tested at the factory. The
unit was red through several complete sequences of start-up
through shutoff to check operation. A check was made of the
air switch, gas pressure switch, high limit operation.
This checkout normally eliminates on-the-job start-up
problems; however, the equipment is subject to variable job
conditions and shipping shocks can change adjustments,
cause damage, and loosen connections and fasteners.
Therefore, it is necessary to go through the complete start-up
procedure even though the unit may appear to be operating
properly.
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS 24 www.DaikinApplied.com
Installation
oPTIonal Gas heaT
IMPORTANT
This furnace must be installed by an experienced
professional installation company that employs fully
trained and experienced technicians. Install the furnace
in accordance with the manufacturer's instructions and
local codes. In the absence of local codes, follow the
National Fuel Gas Code, ANSI Z223.1/NFPA 54, or the CSA
B149.1, Natural Gas and Propane Installation Code.
WARNING
Sharp edges hazard. Can cause personal injury or death.
Sheet metal parts, self-tapping screws, clips, and similar
itemsinherently have sharp edges, and it is necessary that
theinstaller exercise caution when handling these items.
Flue Box
The ue box (Figure 21) is not installed at the factory because
it would increase the width of the unit beyond the allowable
shipping width.
The ue box must be installed over the combustion exhaust
openings. All holes are prepunched, the fasteners are
furnished and everything is shipped inside the fan section.
1. Remove and discard the shipping covers.
2. Position the ue box over the exhaust openings.
3. Line assembly holes up.
4. Install screws to fasten the ue box to the side of the unit.
Outdoor Air (OA) Hood
The OA hood (Figure 22) is not installed at the factory
becauseit would increase the width of the unit beyond the
allowableshipping width. The hood is shipped in a box in the
fansection.
The OA hoods must be installed over the outdoor air openings.
1. Remove and discard the shipping covers.
2. Position the hood over the OA openings.
3. Line assembly holes up.
4. Install screws to fasten the OA hood.
The OA hoods must be installed before the furnace is operated.
Figure 22: Outdoor Air (OA) Hood Installation
Figure 21: Flue Box Installation
www.DaikinApplied.com 25 IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS
Electrical
The Daikin burner receives its electrical power from the main
unit control panel. No additional power wiring must be routed
to the burner. The sequencing of the burner is also controlled
through this panel and therefore is factory wired. No additional
wiring will be required.
DANGER
explosion may result causing property damage, personal
injury, or loss of life.
A. This appliance does not have a pilot. It is equipped with
an ignition device which automatically lights the burner. Do
not try to light the burner by hand.
B. Before operating, smell all around the appliance area for
gas. Be sure to smell next to the oor because some gas
is heavier than air and will settle on the oor.
What to do if you smell gas:
• Do not try to light any appliance.
• Do not touch any electric switch, do not
use any phone in your building.
• Immediately call your gas supplier from a
phone in a neighboring building. Follow
the gas supplier's instructions.
• If you cannot reach your gas supplier,
call the re department.
C. Use only your hand to push in or turn the gas control knob.
Never use tools. If the knob will not push in or turn by hand,
don't try to repair it, call a qualied service technician.
Force or attempted repair may result in a re or explosion.
D. Do not use this appliance if any part has been under water.
Immediately call a qualied service technician to inspect
the appliance and to replace any part of the control system
and any gas control which has been under water.
Gas Piping
Gas piping must be sized to provide the minimum required
pressure at the burner when the burner is operating at
maximum input. Consult your local utility on any questions on
gas pressure available, allowing piping pressure drops, and
local piping requirements.
Install all piping in accordance with the National Fuel Gas Code
(ANSI Z223.1), (NFPA 54-1999) and any applicable local codes.
The weight of the eld-supplied gas pipe must be supported by
eld-installed brackets or hangers.
The proper size piping must be run from the meter to the
gas burner without reductions. Undersized piping will result
in inadequate pressure at the burner. The pressure will be at
its lowest when it is needed the most, at times of maximum
demand. Therefore, it can cause intermittent hard-to-nd
problems because the problem may have left before the
service technician has arrived. Avoid the use of bushings
wherever possible.
Remove all burrs and obstructions from pipe. Do not bend
pipe; use elbows or other pipe ttings to properly locate pipe.
A drip leg and a manual shut-o must be installed in the vertical
line before each burner such that it will not freeze. Install unions
so gas train components can be removed for service. All pipe
threads must have a pipe dope which is resistant to the action of
LP gas. After installation, pressurize the piping as required and
test all joints for tightness with a rich soap solution. Any bubbling
is considered a leak and must be eliminated. Do not use a
match or ame to locate leaks.
Gas Piping Routing Into Unit
On-The-Roof Piping
1. Remove knockout on upright (refer to Figure 23).
2. Route gas supply pipe through hole. Carefully plan pipe
route and tting locations to avoid interference with
swinging of doors, etc.
Gas Pressure Requirements
The pressure furnished to the main gas valve must not exceed
13.9" wc. When the supply pressure is above 13.9" wc, a
high pressure regulator must precede the appliance gas
pressure regulator. The inlet gas pressure must not exceed the
maximum pressure rating of the high pressure regulator, and
the outlet pressure must furnish gas to the appliance pressure
regulator within the pressure range mentioned above.
Figure 23: Piping Schematic
Field Gas Piping
7.0" (177.8)
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS 26 www.DaikinApplied.com
Field Gas Heat Connections
The appliance must be isolated from the gas supply system by
closing off the manual shut off valve during any pressure testing
less than 0.5 psi (3.5 kPa) of the gas supply piping system.
The appliance and its individual shut-off valve must be
disconnected from the gas supply system during any pressure
testing greater than or equal to 0.5 psi (3.5 kPa).
Regulator to be sized for the maximum total Btu input required
for the heater(s).
Figure 24: Field Gas Heat Connections
From Gas Meter
Manual Gas
Shut-Off Valve
with 1/4" NPT
Test Plug
* Factory-supplied grommet must be utilized
Unit Gas Supply
Connection*
oPTIonal Gas heaT
oPTIonal Gas heaT
Altitude Conversion
For elevations up to 2000 feet, rating plate input ratings apply.
For high altitudes (elevations over 2000 ft) contact Daikin
Applied Parts. See Table 16 for part numbers. Or contact local
gas supplier to conrm gas heating value has been devalued
for applicable elevations.
Table 16: Furnace Identication for Altitude
Elevation (ft.) Part Number
Natural Gas Fired Furnace with 50 MBH Burners
2000–2999 910166410
3000–3999 910166411
4000–4999 910166412
5000–5999 910166413
6000–6999 910166415
Natural Gas Fired Furnace with 45 MBH Burners
2000–2999 910166412
3000–3999 910166416
4000–4999 910166417
5000–5999 910166415
6000–6999 910166418
LPG Gas Fired Furnace with 50 MBH Burners
2000–2999 910166419
3000–3999 910166420
4000–4999 910166421
5000–5999 910166422
6000–6999 910166424
LPG Gas Fired Furnace with 45 MBH Burners
2000–2999 910166425
3000–3999 910166422
4000–4999 910166427
5000–5999 910166428
6000–6999 910166429
www.DaikinApplied.com 27 IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS
Gas Pipe Manifold Pressure Adjustment for Natural Gas Fuel
For Two Stage Furnace
1. Read gas pressure at the Inlet Pressure Tap of the
Honeywell VR8305Q Gas Safety Control Valve (Figure
25) and conrm pressure is at 7.0" wc. Adjust upstream
pressure reducing gas regulator as required to obtain
7.0" wc gas pressure.
2. The gas pipe manifold pressure for high fire
(stage #2) should be set at 3.2" wc. Adjust the
High Pressure Adjustment Honeywell VR8305Q
Gas Safety Control Valve (Figure 25) as required.
Screwing the adjustment clockwise will increase
pressure; counter clockwise will decrease pressure.
3. The gas pipe manifold pressure for low re (stage
#1) should be set at 0.8" wc. Adjust the Low Pressure
Adjustment Honeywell VR8305Q Gas Safety Control
Valve (Figure 25) as required. Screwing the adjustment
clockwise will increase pressure; counter clockwise will
decrease pressure.
For Modulating Furnace:
1. Read gas pressure at the Inlet Pressure Tap of the
Honeywell VR8305Q Gas Safety Control Valve (Figure
25) and conrm pressure is at 7.0" wc. Adjust upstream
pressure reducing gas regulator as required to obtain
7.0" wc gas pressure.
2. The gas pipe manifold pressure for high re should be set
at 3.2" wc. Adjust the High Pressure Adjustment on the
Honeywell VR8305Q Gas Safety Control Valve (Figure
25) as required. Screwing the adjustment clockwise
will increase pressure; counter clockwise will decrease
pressure.
3. The gas pipe manifold pressure for low re (stage #1)
should be set at 0.25" wc.
Adjust the Low Pressure Adjustment on the Honeywell
VR8305Q Gas Safety Control Valve (Figure 25) as
required until pressure at the Honeywell VR8305Q Gas
Safety Control Valve Outlet Pressure Tap reads 0.25"
wc. Screwing the adjustment clockwise will increase
pressure; counter clockwise will decrease pressure.
Adjust the Maxitrol M520B Modulating Valve (Figure 26)
Low Flow Adjustment screw until the gas pipe manifold
pressure reads 0.25" w.c.
oPTIonal Gas heaT
Figure 25: Honeywell VR8305Q Gas Safety Control Valve Figure 26: Maxitrol M520B Modulating Valve
High Pressure Adjustment
Pressure Regulator Adjustment
(under cap screw)
Low Pressure Adjustment
ON–OFF Gas Control Knob
Outlet Pressure Tap
Inlet Pressure Tap
Low Flow Adjustment Tap
(right side)
Low Flow Adjustment Tap
(left side)
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS 28 www.DaikinApplied.com
Gas Pipe Manifold Pressure Adjustment for Propane Gas Fuel:
For Two Stage Furnace:
1. Read gas pressure at the Inlet Pressure Tap of the
Honeywell VR8305Q Gas Safety Control Valve (Figure
25) and conrm pressure is at 11.0" wc. Adjust upstream
pressure reducing gas regulator as required to obtain
11.0" wc gas pressure.
2. The gas pipe manifold pressure for high re (stage
#2) should be set at 8.2" wc. Adjust the High Pressure
Adjustment Honeywell VR8305Q Gas Safety Control
Valve (Figure 25) as required. Screwing the adjustment
clockwise will increase pressure; counter clockwise will
decrease pressure.
3. The gas pipe manifold pressure for low re (stage #1)
should be set at 2.05" wc. Adjust the Low Pressure
Adjustment Honeywell VR8305Q Gas Safety Control
Valve (Figure 25) as required. Screwing the adjustment
clockwise will increase pressure; counter clockwise will
decrease pressure.
For Modulating Furnace:
1. Read gas pressure at the Inlet Pressure Tap of the
Honeywell VR8305Q Gas Safety Control Valve (Figure
25) and conrm pressure is at 11.0" wc. Adjust upstream
pressure reducing gas regulator as required to obtain
11.0" wc gas pressure.
2. The gas pipe manifold pressure for high re should be set
at 8.2" wc. Adjust the High Pressure Adjustment on the
Honeywell VR8305Q Gas Safety Control Valve (Figure
25) as required. Screwing the adjustment clockwise
will increase pressure; counter clockwise will decrease
pressure.
3. The gas pipe manifold pressure for low re (stage #1)
should be set at 0.51" wc.
Adjust the Low Pressure Adjustment on the Honeywell
VR8305Q Gas Safety Control Valve (Figure 25) as
required until pressure at the Honeywell VR8305Q Gas
Safety Control Valve Outlet Pressure Tap reads 0.51"
wc. Screwing the adjustment clockwise will increase
pressure; counter clockwise will decrease pressure.
Adjust the Maxitrol M520B Modulating Valve (Figure 26)
Low Flow Adjustment screw until the gas pipe manifold
pressure reads 0.51" w.c.
oPTIonal Gas heaT
www.DaikinApplied.com 29 IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS
oPTIonal Gas heaT
Figure 27: Capacity of Pipe Natural Gas (CFH)
With Pressure Drop of 0.3" W.C. & Specic Gravity of 0.60
Pipe Length
(ft)
10 132 278 520 1050 1600 2050 4800 8500 17500
20 92 190 350 730 1100 2100 3300 5900 12000
30 73 152 285 590 890 1650 2700 4700 9700
40 63 130 245 500 760 1450 2300 4100 8300
50 56 115 215 440 670 1270 2000 3600 7400
60 50 105 195 400 610 1150 1850 3250 6800
70 46 96 180 370 560 1050 1700 3000 6200
80 53 90 170 350 530 990 1600 2800 5800
90 40 84 160 320 490 930 1500 2600 5400
100 38 79 150 305 460 870 1400 2500 5100
125 34 72 130 275 410 780 1250 2200 4500
150 31 64 120 250 380 710 1130 2000 4100
175 28 59 110 225 350 650 1050 1850 3800
200 26 55 100 210 320 610 980 1700 3500
NOTE: Use multiplier below for other gravities and pressure drops.
½ ¾ 1 1¼ 1½ 2 2½ 3 4
Pipe Size-inches (Ips)
Table 17: Specic Gravity Other Than 0.60
Specic Gravity Multiplier
0.50 1.100
0.60 1.000
0.70 0.936
0.80 0.867
0.90 0.816
1.00 0.775
Propane-Air
1.10 0.740
Propane
1.55 0.622
Butane
2.00 0.547
Table 18: Pressure Drop Other Than 0.3"
Pressure Drop Multiplier Pressure Multiplier
0.1 0.577 1.0 1.83
0.2 0.815 2.0 2.58
0.3 1.000 3.0 3.16
0.4 1.16 4.0 3.65
0.6 1.42 6.0 4.47
0.8 1.64 8.0 5.15
Sequence of Operation (Staged Control)
Low Heat Option (2 Stage Control)
The following details the sequence of operation for the low
heat option.
1. Unit DDC control calls for heat.
2. Furnace DDC control module receives a call for heat.
3. High limit switch is checked for safe condition.
4. Proof of airow switch is check for combustion airow.
5. 60 second prepurge cycle starts.
6. Spark ignitor is activated for 3 seconds.
7. Gas valve receives a command for stage 1 of heat.
8. Burner is ignited.
9. Unit DDC controller calls for stage 2 of heat.
10. Furnace DDC controller receives a stage 2 heat command.
11. Gas valve receives a command for stage 2 of heat.
High Heat Option (4 Stage Control)
For a unit with the optional high heat the above sequence is
followed for the rst two stages.
For the remaining 2 stages the above procedure is repeated on
the second furnace module.
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS 30 www.DaikinApplied.com
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