Field Electric Heater
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)
035-000037-001 Page 2 of 8 MVA Field Heater Accessory IOM 1.0 5-19-2014
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
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