78630 Installation and Service Manual
2-518.8
5H0709840000
INSTALLATION INSTRUCTIONS
low voltage control
electric unit heaters
July 2021
Description
The 240/24 or 208/24 volt transformer relay is rated for resistive
loads up to 6000 watts or motor loads up to twelve amps. Units
with 480 or 600V supply voltage (33 or 34 power code) come
standard with a 480 or 600V to 240V transformer making the
low voltage control kit compatible with power code 33 or 34.
Wiring of this control kit should only be performed by a qualified
electrician.
WARNING
1. Disconnect power supply before making wiring connections
to prevent electrical shock and equipment damage.
2. All units must be wired strictly in accordance with wiring
diagram furnished with the unit. Any wiring different from
the wiring diagram could result in a hazard to persons and
property.
3. All wiring must be done with a wiring material having a
temperature rating of at least 105°C.
IMPORTANT
1. The use of this manual is specifically intended for a
qualified installation and service agency. All installation
and service of these kits must be performed by a qualified
installation and service agency.
2. These instructions must also be used in conjunction with
the Installation and Service Manual that originally shipped
with the appliance, in addition to any other accompanying
component supplier literature.
Figure 1
Installation - HER models
Figure 2
Wiring Diagram - HER models
Locknut
Transformer Relay
FROM POWER SUPPLY TO CONTACTOR COIL OR
LIMIT CONTROL
YL
CONTROL
TERMINAL
BLOCK
WIRING LEGEND
WIRE NUT
SUPPLIED BY
OTHERS
BK BU
- - FIELD WIRING
FACTORY WIRING
*
TO LOW VOLTAGE
THERMOSTAT
TRANSFORMER RELAY
ALL WIRING MUST COMPLY WITH NATIONAL
ELECTRICAL CODES AND ALL LOCAL CODES.
ALL COMPONENTS MUST AGREE WITH THEIR
RESPECTIVE POWER SOURCE.
CONNECT YELLOW WIRE
TO THE POWER BLOCK
TERMINAL ON L1
Description
Part Number
240/24V 208/24V
Transformer Relay 5H0709830001 5H0709830002
Installation and wiring - HER models
1. Disconnect power supply before making wiring connections
to prevent electrical shock and equipment damage. All
units must be wired strictly in accordance with wiring
diagram furnished with the unit.
2. Open the hinge bottom panel.
3. Insert the transformer relay to the back panel with the
locknut, as shown in Figure 1.
4. Fasten the transformer relay to the back panel with the
locknut, as shown in Figure 1.
5. Wire transformer relay per Figure 2. Be sure to connect
yellow wire to the power block terminal where the fan motor
lead is tied in at. Refer to wiring diagram on the inside of
bottom pan.
Installation and wiring - VE and PTE models
1. Disconnect power supply before making wiring connections
to prevent electrical shock and equipment damage. All
units must be wired strictly in accordance with wiring
diagram furnished with the unit.
2. Remove cover from power junction box..
3. Insert the transformer relay lead wires into the control
wiring hole in the power junction box.
4. Fasten the transformer relay to the power junction box with
the locknut
Any damage to, or failure of Modine units caused by
incorrect wiring of the units is not covered by Modine's
standard warranty.
2-518.8