Daikin MPS015 F 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 Identication 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 Airow Measurement Technology..........48
Unit Options ...........................................53
Economizer Enthalpy Contro .............................53
External Time Clock ....................................53
Exhaust Fan Option ....................................53
Proof-of-Airow 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 ..................................... 110
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
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Table of ConTenTs

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 congurations, 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-specic operation manual (see Table 1).
Table 1: Program Specic Unit Operation Literature
Rooftop unit control conguration Manual bulletin number
VFDs
OM 844 - MD2
OM 895 - MD3
OM 1190 - MD4
OM 1191 - MD5
OM 847 - MD6
MPS Unit Controller
Discharge Air Control (VAV or CAV)
Space Comfort Control (SCC)
OM 920
LonWorks Integration IM 918
BACnet Integration IM 917
BACnet IP Comm Module IM 916
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 Identication 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)
M P S – 015 – F G A
Daikin Packaged System
Nominal capacity (tons)
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
General InformaTIon
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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.
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
Evaporator/
Hot Gas Reheat Coil
Optional
Energy Recovery Wheel
Exhaust Air Fan Assembly
Optional
Energy Recovery Wheel (ERW)
Assembly
Fan
Assembly
(removal from
this side only)
Optional Gas Furnace
or Electric Heat
15-50 Ton
Optional Hot
Water Heat
(removal from
this side only*)
15-50 Ton 61-75 Ton
A= 72 (1828 mm) 60 (1524 mm)
B= 60 (1524 mm) 72 (1828 mm)
* 61-75 Ton
Fan and Gas/Electric/Hot Water
Heaters can be removed from
either side
B
A
60.00
(1524 mm)
60.00
(1524 mm)
96.00
(2438 mm)
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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 specied (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.
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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.
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.
Figure 2: Roof Curb Assembly (MPS 026G – 035F Example)
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Figure 3: Roof Curb Layout—MPS 015F – 020G
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Figure 4: Roof Curb Layout—MPS 026G – 035F
23.50
[597 mm]
2.00
[51 mm]
2.00
[51 mm] 21.25
[540 mm]
71.38
[1813 mm]
15.87
[403 mm]
87.25
[2216 mm]
(INSIDE CURB)
1.25
[32 mm] TYP
1.63
[41 mm]
93.70
[2380 mm]
171.18 (INSIDE CURB)
[4348 mm]
63.69
[1610 mm]
2.00
[51 mm]
2.00
[51 mm]
1.00
[26 mm]
1.00
[26 mm]
2.00
[51 mm]
3.75
[95 mm]
PLAN VIEW
23.86
[606 mm]
CURB CROSS SECTION
KNOCKOUT DETAIL
F
HOT WATER
ONLY
CHASE
1.00
[25 mm]
19.00
[483 mm]
0.38
[9.7 mm]
0.38
[9.7 mm]
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Figure 5: Roof Curb Layout—MPS 040F – 050F
CURB CROSS SECTION
2.00
[51 mm]
2.00
[51 mm]
30.63
[778 mm]
87.25
[2216 mm]
(INSIDE CURB)
2.00
[51 mm]
1.25 TYP
[32 mm] 1.63
[41 mm]
69.39
[1763 mm] 105.45
[2678 mm]
208.57 (INSIDE CURB)
[5298 mm]
71.38
[1813 mm]
15.87
[403 mm]
28.25
[718 mm]
2.00
[51 mm]
2.00
[51 mm]
1.00
[25 mm]
3.75
[95 mm]
28.92
[735 mm]
PLAN VIEW
F
1.00
[25 mm]
26.00
[660 mm]
HOT WATER
ONLY
CHASE
0.38
[9.7 mm]
0.38
[9.7 mm]
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Figure 6: MPS 015–020 Roof Curb with Energy Recovery Wheel
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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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Rigging and Handling
WARNING
Only trained and qualied 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
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
015–035 14 341
24 504
040–050 14 461
24 706
Unit with Energy Wheel
015–035 14 458
24 674
040–050 14 619
24 908
LIFT UNIT ONLYAS SHOWN
SPREADER BARS REQUIRED
MUST USE ALL OF THESE
LIFTING LUGS FOR LIFTING UNIT.
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Table 4: Weight Distribution Locations (see Figure 10)
Unit
(tons)
Distance
L1 L2 L3 L4
040–050 42.2 66.6 58.3 60.9
Table 5: Weight Distribution Locations (see Figure 11)
Unit
(tons)
Distance
L1 L2 L3
015–035 35.5 62.0 52.0
040–050 40.0 69.0 89.0
Table 6: Weight Distribution — Energy Wheel
Unit
Point
Percent of total
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)
Weights (lbs)
High Gas
Heat
Low Gas
Heat
Electric
Heat
Hot Water
Heat
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
Table 8: Curb Weights
Unit (tons)/
Curb Height (inches)
Weight (lbs)
without ERW with ERW
015–035/14 341 458
015–035/24 501 674
040–050/14 481 619
040–050/24 708 908
Table 9: Energy Recovery Section Weights
Unit Size (tons) Weight (lbs)
015–020 1200
026–035 1540
040–050 1000
Table 10: Additional Weights - Motors/Exhaust Fans
(015–020)
HP Additional Motor
Weight (lbs)
Unit
(tons)
Additional Exhaust
Fan Weight (lbs)
1 0 15–20 150
1.5 9
2 9
3 32
5 43
Table 11: Additional Weights - Motors/Exhaust Fans
(026–050)
HP Additional Motor
Weight (lbs) Unit (tons) Additional Exhaust Fan Weight (lbs)
7.5 0 26 150
10 25 30 150
15 125 35 150
20 175 40 200
25 225 50 200
30 275
Table 12: Additional Weights for 6-Row DX Coil and HGRH
Coil
Unit Size
(tons)
Weight (lbs)
6 Row DX HGRH
15–20 118 70
26–35 164 82
40 187 92
50 231 92
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Figure 10: Rigging the Unit (MPS 026– 035 Example)
Figure 11: Rigging the Unit (MPS 040–050 Example)
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 overow.
Clean drain pans to prevent the spread of disease. Cleaning
should be performed by qualied personnel.
WARNING
Drain pans must be cleaned periodically. Material in uncleaned
drain pans can cause disease. Cleaning should be performed
by qualied personnel.
Figure 12: Condensate Drain Connection
L1
L2
L3
L4
B
AC
E
G
D
F
H
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

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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
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 airow, 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 Airow
Unit Size (tons) AHRI Rated Airow
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.
Linkage
Actuator
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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
Roof
SPS1
Main Control Panel Condenser Section
HI Line
LO Line
Remote Sense Point
To Sensor
HI Input
Pressure Sensing
Tubing
Tubing Extends
Through Approx. 1/8”
Rubber
Grommet
Ductwork
(Remote Location)
To Sensor
LO Input
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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 inuenced 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 inuenced 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.
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Field Power Wiring
Wiring must comply with all applicable codes and ordinances.
The warranty is voided if wiring is not in accordance with these
specications.
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 certied 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.
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.
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) No. of Power
Wires per Phase Wire Gauge
Insulation
Temperature
Rating (°C)
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.
Figure 17: MPS Power Wiring Knockout Locations
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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.
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.
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