Panasonic MVA Series Air Handling Unit Mva18 24 30 36 42 48 60 Fbas6hbcp Installation Operation And Maintenance Manual

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INSTALLATION-ELECTRICAL (cont’d)
TYPICAL WIRING—ELECTRIC HEAT
TYPICAL WIRING DIAGRAMS—
Electric Heat: 3-6kW and 8-9.5kW
TYPICAL WIRING—ELECTRIC HEAT
3 
						

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START-UP
Pre-Startup
Building Envelope—All building windows and doors should
be installed and closed before starting unit. During summer
construction, avoid unit sweating by allowing for gradual pull
down: use reduced capacity and use maximum available
airflow.
Temperature Controls-Check that unit is connected to the
controls system and communicating properly.
Outside Air and Freeze Protection
WARNING: Insure that the property is protected against
freezing conditions Failure to provide freeze protection
may result in property damage.Freeze protection
measures are customer-provided and installed and include
but are not limited to low-limit thermostats, automatic temper-
ature controls, and outside air dampers.
Startup
1. Insure electrical installation agrees with the unit name-
plate (voltage, branch circuit protection, wire size).
2. Close all panels and access doors. Make sure filter me-
dia is clean before starting unit. Replace filter if neces-
sary.
3. Verify that discharge ductwork and input plenum are in
place and secure.
4. Apply power to unit. If unit is equipped with on-board
power switch(es), turn switch(es) to the “On” position.
5. Insure that controls system has power and is operational.
6. Force control system to send fan on signal and speed
signal. Refer to unit wiring diagram and electrical section
for fan speed control arrangement.
7. Fan should start and run. Make sure fan operates with-
out significant noise or vibration.
8. Allow control system to start condensing unit, or as re-
quired for the installation.
9. Complete the checklist on the Start-Up Report.
10. Follow additional startup procedures for the system as
required by the condensing unit.
Fan Airflow Step-Up
If the duct system ESP is higher than planned and increased
Air Handler ESP is needed, shift the terminals as shown in
Figure 15.
Refer to Airflow tables and curves for airflow performance.
Fig. 14 — Fan Wheel Rotation—
FORWARD CURVED FAN 
						

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MVA18Areas not recommend for operation due to excess velocity
Fan Setting RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTSHigh Top 969 833 188 1022 804 197 1067 780 206 1132 743 215 1173 711 222 1201 666 224High 902 774 156 955 749 163 1016 717 173 1067 690 181 1102 656 193 1144 611 201Medium 898 772 152 960 737 160 1012 711 169 1091 669 176 1132 633 182 1158 569 187Low 827 711 116 897 670 123 956 641 131 1050 596 137 1090 555 142 1115 473 149
MVA24
Fan Setting RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTSHigh Top 1236 1052 394 1265 1034 396 1301 996 383 1327 953 345 1351 897 340 1430 838 261High 1109 959 284 1155 929 296 1198 908 302 1233 882 311 1284 849 319 1304 780 302Medium 969 833 188 1022 804 197 1067 780 206 1132 743 215 1173 711 222 1201 666 224Low 902 774 156 955 749 163 1016 717 173 1067 690 181 1102 656 193 1144 611 201
MVA30
Fan Setting RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTSHigh Top 828 1263 275 851 1221 287 865 1186 286 898 1142 301 922 1105 306 915 1082 309High 764 1160 219 795 1114 224 819 1076 239 843 1037 241 825 1014 243 874 975 251Medium 708 1064 171 737 1017 175 758 973 178 794 932 190 785 886 194 856 844 204Low 630 940 121 663 892 125 693 835 130 730 797 138 750 743 143 806 696 152
MVA36
Fan Setting RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTSHigh Top 934 1425 406 943 1396 414 966 1358 417 988 1319 426 1005 1279 432 1032 1246 440High 881 1342 393 900 1311 347 920 1271 356 939 1229 356 967 1195 365 986 1160 370Medium 764 1160 219 795 1114 224 819 1076 239 843 1037 241 825 1014 243 874 975 251Low 708 1064 171 737 1017 175 758 973 178 794 932 190 785 886 194 856 844 204
MVA42
Fan Setting RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTSHigh Top 967 1722 525 985 1679 529 1009 1642 541 1029 1597 546 1050 1557 558 1071 1510 567High 835 1475 332 862 1425 343 890 1388 353 918 1335 365 940 1287 372 970 1238 370Medium 760 1311 248 784 1271 258 803 1229 263 834 1195 274 870 1151 286 900 1114 290Low 717 1228 211 742 1184 218 767 1140 225 803 1099 236 840 1046 246 878 994 254
MVA48
Fan Setting RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTSHigh Top 1057 1894 1040 1080 1872 1031 1093 1816 1020 1104 1764 1010 1109 1685 990 1122 1629 975High 967 1722 525 985 1679 529 1009 1642 541 1029 1597 546 1050 1557 558 1071 1510 567Medium 835 1475 332 862 1425 343 890 1388 353 918 1335 365 940 1287 372 970 1238 370Low 760 1311 248 784 1271 258 803 1229 263 834 1195 274 870 1151 286 900 1114 290
MVA60
Fan Setting RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTS RPM SCFM WATTSHigh Top 982 2323 1010 1010 2269 1040 1037 2222 1050 1064 2180 1070 1093 2132 1090 1115 2092 1110High 878 2082 699 909 2027 711 946 1959 733 979 1932 754 1007 1889 771 1038 1844 791Medium 760 1793 427 807 1716 450 825 1667 466 873 1623 488 913 1577 506 956 1517 520Low 689 1603 314 724 1544 326 761 1489 342 805 1425 362 846 1373 380 890 1335 400NOTES:1. Data at sea level w/ 1 throw-away filter and dry coil.
ESP0.000 0.100 0.200 0.300 0.400 0.500
ESP0.000 0.100 0.200 0.300 0.400 0.500
ESP0.000 0.100 0.200 0.300 0.400 0.500
ESP0.000 0.100 0.200 0.300 0.400 0.500
ESP0.000 0.100 0.200 0.300 0.400 0.500
ESP0.000 0.100 0.200 0.300 0.400 0.500
ESP0.000 0.100 0.200 0.300 0.400 0.500
Figure 15
Increasing ESP setting
Stay
Shift allthreedown
As ShippedHigher Fan Setting
AirflowPerformance 
						

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HTHML
Areanotrecommendedforusefor
exessiveairflow
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
400 500 600 700 800 900Airflow (SCFM)
ExternalStaticPressure(inchW.G.)
MVA18
HTHML
Areanotrecommendedforusefor
exessiveairflow
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
600 700 800 900 1000 1100Airflow (SCFM)
ExternalStaticPressure(inchW.G.)
MVA24
HTHML
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
600 700 800 900 1000 1100 1200 1300Airflow (SCFM)
ExternalStaticPressure(inchW.G.)
MVA30
HTHML
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
800 900 1000 1100 1200 1300 1400 1500Airflow (SCFM)
ExternalStaticPressure(inchW.G.)
MVA36
HTHML
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
800 1000 1200 1400 1600 1800Airflow (SCFM)
ExternalStaticPressure(inchW.G.)
MVA42
HTHML
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
1000 1200 1400 1600 1800 2000Airflow (SCFM)
ExternalStaticPressure(inchW.G.)
MVA48
HTHML
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
1200 1400 1600 1800 2000 2200 2400Airflow (SCFM)
ExternalStaticPressure(inchW.G.)
MVA60
Airflow Performance Curves 
						

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SERVICE
General
1. Review Safety Considerations at beginning of
these instructions. Good safety habits are im-
portant tools when performing service proce-
dures.
2. To make speed measurements, use a laser-style
tachometer.
Fan Motor Replacement
WARNING: Shut off motor power and lock out power
supply.
Remove Blower/Motor Assembly
Procedure:
1. Disconnect wiring harness plugs from motor (Fig.
16 and 17).
2. Remove blower mounting bolts, which secure the
blower rails upward against the blower deck
(2ea).
3. Remove motor/wheel assembly from the MVA
unit by sliding out (Figure 18).
4. See Figure 19. Loosen shaft set screw (opposite
motor side) and motor mount tightening screw
until motor can be removed.
5. Remove motor. Install new motor (Fig. 20), tight-
en motor mount bolt, then locate fan wheel and
tighten shaft set screw.
6. Reverse steps 1-4 to reinstall fan. Make sure
that the two clips at the back hold the blower rails
up against the blower deck.
7. Spin fan by hand to make sure there is no rub-
bing or interference.
8. Close unit access doors, remove lockout/tag out
and restore the unit to operation.
DANGER
NEVER enter an enclosed fan cabinet or reach
into a unit while the fan is running.
LOCK OPEN AND TAG the fan motor power dis-
connect switch before working on a fan. Take fus-
es with you and note removal on tag. Electric
shock can cause personal injury or death.
LOCK OPEN AND TAG the electric heat coil pow-
er disconnect switch before working on or near
heaters.
Failure to follow these warnings could lead to per-
sonal injury or death.
Figure 16
Figure 17
MOTORHARNESS &CONNECTORS
MOTORHARNESS &CONNECTORS 
						

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Fan System Periodic Maintenance
1. Use of a Preventive Maintenance program is
strongly recommended to insure that the unit oper-
ates safely and efficiently.
2. Motor bearings are permanently sealed and do not
require lubrication.
3. Clean the fan’s flow area - maintenance interval in
accordance with the degree of contamination.
4. The fan wheel can be cleaned with a moist cloth.
5. Do not use any aggressive, paint solvent cleaning
agents when cleaning.
6. Never use a high-pressure cleaner or water-spray
for cleaning - particularly when the fan is running.
Coil Cleaning
DETERGENT — Spray mild detergent solution on
coils with garden-type sprayer. Rinse with fresh water.
Check to ensure condensate line is free. Excess water
from cleaning may flood unit if condensate line is
plugged.
DANGER
NEVER enter an enclosed fan cabinet or reach
into a unit while the fan is running.
LOCK OPEN AND TAG the fan motor power dis-
connect switch before working on a fan. Take fus-
es with you and note removal on tag. Electric
shock can cause personal injury or death.
LOCK OPEN AND TAG the electric heat coil pow-
er disconnect switch before working on or near
heaters.
Failure to follow these warnings could lead to per-
sonal injury or death.
Figure 18
MOTOR/BLOWERSLIDES OUT
Figure 19
Figure 20 
						

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SERVICE—Filters
Filters
FILTER SECTIONS — Open or remove
filter panel to replace old filter with a new
filter. See physical data tables for filter
data. See Figure 21.
Access Panels
The 3 sections of the unit can be reached
using the front access panels, removable
using 5/16” socket or driver or flat head
screwdriver. See Figure 22.
Figure 21
Figure 22 
						

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1. Perform procedure on the ground for safety. If
working at heights USE EXTREME CAUTION ob-
serve all FALL SAFETY considerations. Under all
conditions, LOCK OUT all power supplies before
performing this procedure. W ARNING! Coil sec-
tion can be heavy—use proper lifting equipment.
2. Isolate coil and reclaim refrigerant. Disconnect
unit from piping. Remove supply piping to allow
access into the coil section from the front.
3. Remove blower access door and coil access
doors.
4. Carefully remove temperature sensors from the
coil and set them aside, clear of the coil & drain
pan assembly. Disconnect electronic expansion
valve (EEV) wiring from the EEV.
5. Remove 4 screws on the drain pan side of the
cabinet (right side shown in Fig. 23). Remove 4
screws from coil support side of the cabinet (left
side shown in Fig. 23).
6. Slide coil & drain pan assembly out of the unit (Fig
19).
7. Coil can be detached from drain pan using 5/16”
driver, 2 screws. Coil can be detached from coil
support using 5/16” driver, 4 screws.
8. Follow instructions in reverse to install new coil.
SERVICE-Coil Removal and Reinstallation Procedure
Figure 23
9. Re-install sensors back in original posi-
tions. CAUTION! Be sure to place sen-
sors in correct locations for proper unit
operation.
10. Re-install wiring to EEV.
11. Re-install unit access panels.
12. Return unit to service.
COIL SUPPORT
DRAIN PAN 
						

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UNIT ELECTRICAL RATINGS 
						

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UNIT DIMENSIONSMVA18-60 Elec Heat Ready
RH Drain Connections—Configuration B