Panasonic Field Electric Heater Installation Manual

Field Electric Heater Accessory for

MVA Air Handling Unit

Installation, Operation and Maintenance Manual

How to Use this Manual:

This manual gives instructions regarding in­stallation, operation and maintenance for the
Field-installed Electric Heater Accessory for
the MVA Series Air Handler.

Use these instructions in conjunction with
other appropriate instructions, including but
not limited to those instructions supplied with
the air handler and outdoor unit. Installation
must comply with all applicable local codes.

IMPORTANT! Refer to unit installation man­ual for general electrical installation and unit
wiring diagrams and instructions.

GENERAL

Installation and maintenance are to be per­formed only by qualified personnel who are fa­miliar with local codes and regulations and are
experienced with HVAC equipment of this type.

WARNING: Sharp edges, coil surfaces
and rotating fans are a potential injury
hazard – avoid contact.

UNPACKING-CHECK FOR DAMAGE!

WARNING: Hazardous voltage – Discon­nect and Lock Out all incoming power
sources before servicing or installing unit.
ELECTRIC SHOCK CAN CAUSE DEATH.

WARNING: This equipment may be in­stalled well above finished floor—Use ex­treme caution when working at heights.

SAFETY WARNING:

Installer should pay particular attention to
the following words:
NOTE–intended to clarify or make instal­lation easier.
CAUTION–given to prevent equipment
damage.
WARNING–to alert installer that personal

injury and/or equipment damage may
result if installation procedure is not
properly followed.

Immediately inspect each unit for damage up­on receipt.

 Inspect units for external and concealed dam-

age immediately.

 File any damage claims in accordance with the

Freight Damage Policy and Terms and Condi­tions.

 Do not repair damaged units without written

authorization.

 Protect stored units from damage.

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 dis­connect switch before working on a fan. Take fuses
with you and note removal on tag. Electric shock
can cause personal injury or death.
LOCK OPEN AND TAG the electric heat coil power
disconnect switch before working on or near heat­ers.
Failure to follow these warnings could lead to per­sonal injury or death.

035-000037-001 Page 1 of 8 MVA Field Heater Accessory IOM 1.0 5-19-2014

ELECTRIC HEATER ACCESSORY

DANGER

WARNING: Hazardous voltage. Only qualified
personnel must install the electrical service. Dis­connect and Lock Out all incoming power sources
before connecting to electrical service.

WARNING: This appliance must be permanently
grounded in accordance with the National Electrical
Code and local code requirements.

WARNING: For use with copper conductors only.

CAUTION

Use only copper conductors for field-installed elec­trical wiring. Unit terminals are not designed to
accept other types of conductors.

Do not allow wiring to touch the refrigerant tubing,
compressor, or any moving parts of the fan.

Make wiring connections in accordance with the
system wiring system diagram and these instruc­tions. Wrong wiring may cause improper operation
or unit damage!

Unauthorized changes in the internal wiring can be
very dangerous. The manufacturer will accept no
responsibility for any damage or malfunction that
occurs as a result of such unauthorized changes.

Removal Procedure:
To remove electric heater,

1. Disconnect and lock out electrical power
from the unit. Remove heater access panel.
Disconnect power wires from the power
switch—DANGER! - MAKE SURE there is no
voltage on these wires before disconnecting!

2. Disconnect 2 harness connectors at the
blower deck.

3. Remove 2 screws holding heater support
feet to the blower deck.

4. Remove 4 screws that mount the heater to
the heater bulkhead. Handle heater carefully to
avoid damaging the wire heating elements.
Remove heater from the unit.

Fig. 1 — Heater Accessory Installed

(right side panel not shown)

Fig. 2 — Heater Accessory Installed

(right side and heater access panels

not shown)

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ELECTRIC HEATER ACCESSORY

DANGER

Install Procedure:

To install the electric heater,

1. Disconnect and lock out electrical power from
the unit. Remove heater access panel. Discon­nect field power wires from the unit power wires.

DANGER! - MAKE SURE there is no voltage
supply to the unit before proceeding!

2. Disconnect and discard 1 harness connector at
the blower deck.

3. Remove blank plate from heater access panel
(covers square hole for breaker style power
switches).

4. Remove SAT sensor and sensor holder from
heater bulkhead and reposition on unit discharge
ductwork routing through auxiliary SAT sensor
hole on top panel.

5. Install SAT 3 feet after the first 90 degree turn
in the discharge ductwork.

6. Remove plate on the heater bulkhead (4
screws).

7. Install heater by carefully supporting the heater
and inserting it into the opening in the heater bulk­head. NOTE: Make sure to guide the pin into the
hole at the back of the heater shroud. Secure the
heater to the bulkhead with 4 screws.

8. Connect 2 wiring harnesses (male) to the
matching female receptacles in the blower deck.

WARNING: Hazardous voltage. Only qualified
personnel must install the electrical service. Dis­connect and Lock Out all incoming power sources
before connecting to electrical service.

9. Connect field wiring to the breaker-style power
switches on the front of the heater. WARNING!

Be sure to provide the appropriate wire size
and branch circuit protection as required by
the unit nameplate!

10. Install the heater access panel.

11. Install the silicone cover “boot” over the top of
the power switches. This protects them from dust
buildup. The switches may be activated through
the flexible boot material.

12. Mark the nameplate label with the matching
heater kW rating. Label is located on the exterior
of the front top panel.

13. Update EEPROM settings to values shown in
the table. Refer to test run manual for detailed
instructions for changing the EEPROM settings.

Item Code New Settings

07 0001
38 0002

3C -001

COVER

BOOT

HEATER
ACCESS

PANEL

H

G

I

R

HEATER

ASSEMBLY

POWER

SWITCH(ES)

HEATER
SHROUD

PIN

E

D

I

S

T

Fig. 4 — Heater

Accessory

Installed

HEATER
SHROUD

HEATER

BULKHEAD

Fig. 3 — Heater Accessory Removal

(right side and heater access panels

not shown for clarity)

035-000037-001 Page 3 of 8 MVA Field Heater Accessory IOM 1.0 5-19-2014

INSTALLATION-ELECTRICAL

DANGER

DANGER

WARNING: Hazardous voltage. Only qualified
personnel must install the electrical service. Dis­connect and Lock Out all incoming power sources
before connecting to electrical service.

WARNING: This appliance must be permanently
grounded in accordance with the National Electrical
Code and local code requirements.

WARNING: For use with copper conductors only.

Typical wiring diagrams are shown on the following
pages FOR REFERENCE. Always refer to the wir­ing diagram on the air handling unit for actual wir­ing.

NOTE: CHECK MOTOR RATING PLATE FOR
CORRECT LINE VOLTAGE.

Connect electrical service to unit. Refer to unit wir­ing diagram.

Power Wiring

For power supply connection, route field power wir­ing L1 and L2 and connect either:

1. Unit Without EH: to field-provided and installed
disconnect switch and from switch to power
entry (unit side) and to unit power leads inside
the unit electrical section; or

2. Unit With EH: into the unit through power entry
(unit side) and then to the factory installed pow­er switch inside the electrical section (part of
the heater accessory—see Figure 5). Note:
power switch looks like a circuit breaker but
does not provide overload protection. Pow­er switch provided only with electric heater (field
kit or factory installed). NOTE: When electric
heat greater than 10kW is provided, two power
supply circuits are required.

NEVER enter an enclosed fan cabinet or reach into
a unit while the fan is running.
LOCK OPEN AND TAG the fan motor power dis­connect switch before working on a fan. Take fuses
with you and note removal on tag. Electric shock
can cause personal injury or death.
LOCK OPEN AND TAG the electric heat coil power
disconnect switch before working on or near heat­ers.
Failure to follow these warnings could lead to per­sonal injury or death.

CAUTION

Use only copper conductors for field-installed
electrical wiring. Unit terminals are not de­signed to accept other types of conductors.

malfunction of the air conditioner caused by electri­cal noise, route control wiring and inter-unit control
wiring SEPARATELY FROM THE POWER WIRING!

General

Provide strain relief where field wiring passes
through cabinet. Wiring within the cabinet has been
positively located and supported so that it does not
pass over sharp metal edges or come in contact with
moving parts. After servicing, position wiring proper­ly in the original supports.

All field-installed wiring, including the electrical
ground, MUST comply with the National Electrical
Code (NEC) as well as applicable local codes. In
addition, all field wiring must conform to the Class II
temperature limitations described in the NEC.
Refer to factory wiring diagrams installed in the unit.

For communicating controls, refer to the condensing
unit operation manual.

Refer to nameplate or Electrical Ratings (page 7)
for FLA, maximum overcurrent protection device

POWER
SWITCH

(MOPD) and minimum circuit ampacity (MCA). Also
refer to wiring diagram affixed to unit to make con­trol and power wiring connections. For new heater
installation, mark the nameplate label with the
matching heater kW rating. Label is located on the
exterior of the front top panel.

NOTE: Installer is responsible for power wiring and
branch circuit over current protection.

Control Voltage Wiring

Control voltage wiring may enter the unit at the con­trol box located behind the blower access door, or
other convenient location. Control voltage wiring
leads exit the bottom of the control box and are
ready for field-connection. CAUTION! To prevent

035-000037-001 Page 4 of 8 MVA Field Heater Accessory IOM 1.0 5-19-2014

Unit with Electric Heat

Figure 5

INSTALLATION-ELECTRICAL (cont’d)

TYPICAL WIRING DIAGRAMS—

Electric Heat: 1-6kW and 8-9.5kW

TYPICAL WIRING—ELECTRIC HEAT

TYPICAL WIRING—ELECTRIC HEAT

035-000037-001 Page 5 of 8 MVA Field Heater Accessory IOM 1.0 5-19-2014

INSTALLATION-ELECTRICAL (cont’d)

TYPICAL WIRING DIAGRAMS—

Electric Heat: 14.5kW and 19.5kW

TYPICAL WIRING—ELECTRIC HEAT

TYPICAL WIRING—ELECTRIC HEAT

035-000037-001 Page 6 of 8 MVA Field Heater Accessory IOM 1.0 5-19-2014

240

208

240

208

240

208

240

208

240

208

240

208

240

208

240

208

240

208

MOTOR

MIN

UNIT ELECTRICAL RATINGS

MVA Electrical Data

MVA

Unit
Size

18/24

30/36

42

48

60

FLA

240-

208V

3.0

3.6

4.9

6.0

7.6

TOTAL

ELECTRIC

HT (KW)

NONE

1.0 0.8 4.2 3.6 0.0 0.0 7.2 6.6 n/a n/a 9.0 8.3 n/a n/a 15 15 n/a n/a 14

3.0 2.3 12.5 10.8 0.0 0.0 15.5 13.8 n/a n/a 19.4 17.3 n/a n/a 20 20 n/a n/a 12

5.0 3.8 20.8 18.1 0.0 0.0 23.8 21.1 n/a n/a 29.8 26.3 n/a n/a 30 30 n/a n/a 10

6.0 4.5 25.0 21.7 0.0 0.0 28.0 24.7 n/a n/a 35.0 30.8 n/a n/a 35 35 n/a n/a 8

8.0 6.0 33.3 28.9 0.0 0.0 36.3 31.9 n/a n/a 45.4 39.9 n/a n/a 50 40 n/a n/a 8

9.5 7.1 39.6 34.3 0.0 0.0 42.6 37.3 n/a n/a 53.2 46.6 n/a n/a 60 50 n/a n/a 6

NONE NONE

1.0 0.8 4.2 3.6 0.0 0.0 7.8 7.2 n/a n/a 9.7 9.0 n/a n/a 15 15 n/a n/a 14

3.0 2.3 12.5 10.8 0.0 0.0 16.1 14.4 n/a n/a 20.1 18.0 n/a n/a 25 20 n/a n/a 10

5.0 3.8 20.8 18.1 0.0 0.0 24.4 21.7 n/a n/a 30.5 27.1 n/a n/a 35 30 n/a n/a 8

6.0 4.5 25.0 21.7 0.0 0.0 28.6 25.3 n/a n/a 35.8 31.6 n/a n/a 40 35 n/a n/a 8

8.0 6.0 33.3 28.9 0.0 0.0 36.9 32.5 n/a n/a 46.2 40.6 n/a n/a 50 45 n/a n/a 8

9.5 7.1 39.6 34.3 0.0 0.0 43.2 37.9 n/a n/a 54.0 47.4 n/a n/a 60 50 n/a n/a 6

14.5 10.9 39.6 34.3 20.8 18.1 43.2 37.9 20.8 18.1 54.0 47.4 26.0 22.6 60 50 30 25 6
NONE NONE

1.0 0.8 4.2 3.6 0.0 0.0 9.1 8.5 n/a n/a 11.3 10.6 n/a n/a 15 15 n/a n/a 14

3.0 2.3 12.5 10.8 0.0 0.0 17.4 15.7 n/a n/a 21.8 19.7 n/a n/a 25 20 n/a n/a 10

5.0 3.8 20.8 18.1 0.0 0.0 25.7 23.0 n/a n/a 32.2 28.7 n/a n/a 35 30 n/a n/a 10

6.0 4.5 25.0 21.7 0.0 0.0 29.9 26.6 n/a n/a 37.4 33.2 n/a n/a 40 35 n/a n/a 8

8.0 6.0 33.3 28.9 0.0 0.0 38.2 33.8 n/a n/a 47.8 42.2 n/a n/a 50 45 n/a n/a 8

9.5 7.1 39.6 34.3 0.0 0.0 44.5 39.2 n/a n/a 55.6 49.0 n/a n/a 60 50 n/a n/a 6

14.5 10.9 39.6 34.3 20.8 18.1 44.5 39.2 20.8 18.1 55.6 49.0 26.0 22.6 60 50 30 25 6

19.5 14.6 39.6 34.3 41.7 36.1 44.5 39.2 41.7 36.1 55.6 49.0 52.1 45.1 60 50 60 50 6

NONE NONE

1.0 0.8 4.2 3.6 0.0 0.0 10.2 9.6 n/a n/a 12.7 12.0 n/a n/a 15 15 n/a n/a 14

3.0 2.3 12.5 10.8 0.0 0.0 18.5 16.8 n/a n/a 23.1 21.0 n/a n/a 25 25 n/a n/a 10

5.0 3.8 20.8 18.1 0.0 0.0 26.8 24.1 n/a n/a 33.5 30.1 n/a n/a 35 35 n/a n/a 10

6.0 4.5 25.0 21.7 0.0 0.0 31.0 27.7 n/a n/a 38.8 34.6 n/a n/a 40 35 n/a n/a 8

8.0 6.0 33.3 28.9 0.0 0.0 39.3 34.9 n/a n/a 49.2 43.6 n/a n/a 50 45 n/a n/a 8

9.5 7.1 39.6 34.3 0.0 0.0 45.6 40.3 n/a n/a 57.0 50.4 n/a n/a 60 60 n/a n/a 6

14.5 10.9 39.6 34.3 20.8 18.1 45.6 40.3 20.8 18.1 57.0 50.4 26.0 22.6 60 60 30 25 6

19.5 14.6 39.6 34.3 41.7 36.1 45.6 40.3 41.7 36.1 57.0 50.4 52.1 45.1 60 60 60 50 6
NONE NONE NONE

1.0 0.8 4.2 3.6 0.0 0.0 11.8 11.2 n/a n/a 14.7 14.0 n/a n/a 15 15 n/a n/a 14

3.0 2.3 12.5 10.8 0.0 0.0 20.1 18.4 n/a n/a 25.1 23.0 n/a n/a 30 25 n/a n/a 10

5.0 3.8 20.8 18.1 0.0 0.0 28.4 25.7 n/a n/a 35.5 32.1 n/a n/a 40 35 n/a n/a 8

6.0 4.5 25.0 21.7 0.0 0.0 32.6 29.3 n/a n/a 40.8 36.6 n/a n/a 45 40 n/a n/a 8

8.0 6.0 33.3 28.9 0.0 0.0 40.9 36.5 n/a n/a 51.2 45.6 n/a n/a 60 50 n/a n/a 6

9.5 7.1 39.6 34.3 0.0 0.0 47.2 41.9 n/a n/a 59.0 52.4 n/a n/a 60 60 n/a n/a 6

14.5 10.9 39.6 34.3 20.8 18.1 47.2 41.9 20.8 18.1 59.0 52.4 26.0 22.6 60 60 30 25 6

19.5 14.6 39.6 34.3 41.7 36.1 47.2 41.9 41.7 36.1 59.0 52.4 52.1 45.1 60 60 60 50 6

ELECTRIC HEAT AMPS

CIRCUIT 1 CIRCUIT 2 CIRCUIT 1 CIRCUIT 2 CIRCUIT 1 CIRCUIT 2

NONE NONE

NONE

NONE

NONE

UNIT FLA Max imum Overcurrent

3.0 3.0 n/a n/a 3.8 3.8 n/a n/a 15 15 n/a n/a 14

3.6 3.6 n/a n/a 4.5 4.5 n/a n/a 15 15 n/a n/a 14

4.9 4.9 n/a n/a 6.1 6.1 n/a n/a 15 15 n/a n/a 14

6.0 6.0 n/a n/a 7.5 7.5 n/a n/a 15 15 n/a n/a 14

7.6 7.6 n/a n/a 9.5 9.5 n/a n/a 15 15 n/a n/a 14

MINIMUM CIRCUIT

AMPACITY

Protective Device (A)

CIRCUIT 1

CIRCUIT 2

WIRE

SIZE

AWG*

Notes:
*1. Minimum Wire Gauge is based upon Circuit 1 ampacity and the use of 75C wire at the unit.

2. 14.5kW and 19.5kW Heating units require two supply circuits.

3. MVA18/24 use ECM 5.0 motor. MVA30/36/42/48/60 use ECM-VE motor.

035-000037-001 Page 7 of 8 MVA Field Heater Accessory IOM 1.0 5-19-2014

Field Electric Heater Accessory for
MVA Air Handling Unit

Installation, Operation and Maintenance Manual

035-000037-001 Page 8 of 8 MVA Field Heater Accessory IOM 1.0 5-19-2014