Instructions / Assembly

INSTALLATION – HOT WATER PIPING / ELECTRICAL CONNECTIONS
6 1-500.3
HOT WATER PIPING
CAUTION
1. Units are designed for use in heating applications with
ambient temperatures between 40°F and 100°F.
Heaters should not be used in applications where the
heated space temperature is below 40°F unless a glycol
anti-freeze solution has been added.
2. Units not approved for use in potable water systems.
3. Do not reuse any mechanical or electrical components
which have been wet. Replace defective components.
4. Do not operate the unit with steam. The coil is not
designed for steam condensate removal which can
damage the unit.
IMPORTANT
1. No water-flow can cause a freeze condition resulting in
damage to the coil.
2. Never leave the unit filled with water in a building
without heat unless a glycol solution has been added.
1. Do not operate the units with steam. The coil is not
designed for steam condensate removal which can
damage the unit.
2. Supply and return lines should be adequately sized to
handle heating requirements under maximum load.
3. Piping connections are ½ ” NPT (see Figure 6.1).
4. Install unions and shut-off valves in lines to and from the
unit to allow maintenance or replacement of unit without
shutting down and draining entire system.
5. Install a return line circuit setter to regulate water flow.
6. Include an air vent at the high point of the piping to allow
removal of entrained air if required.
7. Include a drain valve (hose bib) at the low end of the
piping to allow removal of water from the coil if required.
8. It is advisable to use a pipe line strainer before the coil.
9. Provide adequate pipe hangers, supports, or anchors to
secure the piping system independently of the coil.
10. Install piping to provide for expansion and contraction
normally encountered with temperature changes.
11. Hot water pipes should be insulated to reduce heat loss.
Figure 6.1 – Unit Electrical and Piping Access Locations
Note: Standard piping/electrical access side orientation shown.
ELECTRICAL CONNECTIONS
WARNING
1. Disconnect power supply before making wiring
connections to prevent electrical shock and
equipment damage.
2. All appliances must be wired strictly in accordance
with the wiring diagram furnished with the appliance.
Any wiring different from the wiring diagram could
result in a hazard to persons and property.
3. Any original factory wiring that requires replacement
must be replaced with wiring material having a
temperature rating of at least 105°C.
4. Ensure that the supply voltage to the appliance, as
indicated on the serial plate, is not 5% greater than
rated voltage.
CAUTION
Ensure the supply voltage to the appliance, as indicated
on the serial plate, is not 5% less than the rated voltage.
1. Installation of wiring must conform with local building
codes, or in the absence of local codes, with the
National Electric Code ANSI/NFPA 70 - Latest Edition.
Unit must be electrically grounded in conformance to
this code. In Canada, wiring must comply with CSA
C22.1, Part 1, Electrical Code.
2. Electric wiring must be sized to carry the full load amp
draw of the motor and any controls that are used with
the unit heater.
3. The power supply to the unit must be protected with a
fused or circuit breaker switch, sized based on motor
current rating shown on the unit serial plate, and
applicable National Electric Code procedures.
4. All units are provided with an electrical junction box
(Figure 6.1). Make wiring connections from
115V/60Hz/1ph building service to control box as shown
on wiring diagram furnished with the unit (Figure 6.2).
5. Any damage to or failure of Modine units caused by
incorrect wiring of the units is not covered by warranty.
6. The power supply must be within +/- 5 percent of the
voltage rating. If not, advise the utility company.
Figure 6.2 – Unit Electrical Wiring Diagram
Electrical
Conduit Entry
Electrical J-Box
Access Door
Solid State Motor Speed Control
Unit Serial
Plate
Hot Water Supply/Return Piping
Connections (not pictured)
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