59
Electric Heating
Heating
is
accomplished
by
passing
electrical current through a specified amount
of resistance heaters which will produce the
required heat. The indoor fan motor will
energize at the same time as the heaters.
Wiring to the air handling unit must be done
in accordance with local electrical codes and
standards. Check specified electrical rating
and install with proper wire size.
Electrical
Verify the unit name plate agrees with
power supply. M2 Series units are provided
with single point power wiring connections.
Connection terminations are made to the
main terminal block. A complete set of unit
specific wiring diagrams, showing factory
and field wiring are laminated in plastic and
located inside the controls compartment
door.
All units require a field supplied electrical
overcurrent and short circuit protection.
Device must not be sized larger than the
Maximum Overcurrent Protection (MOP)
shown on the unit nameplate.
Codes may require a disconnect switch be
within sight of the unit.
Note:
Do not install the required field
installed
overcurrent
protection
or
disconnect switch on the unit!
Electrical supply can enter through the
bottom or side of the controls compartment.
Entry must be field cut into panels of the
unit.
A single point connection to a terminal
block is provided. Split units may require
connection between the units. High voltage
conductors should enter the control panel in
a separate opening and separate conduit than
24V low voltage conductors.
Note:
Locations for field cut electrical
entries are marked on the unit. Field cut
openings must be a minimum of 6 inches
away from all components and wiring to
prevent damage due to drilling or cutting.
To pass wires through the wall or roof of the
unit, a hole should be cut and conduit passed
through it. Use the following procedure to
cut a round hole in a foam panel.
Cutting Electrical Openings
1. Locate the placement of the hole. Be sure
that the conduit will not interfere with the
operation of any component or prevent
access of any door or removable panel.
2. Drill a pilot hole all the way through the
foam panel.
3. Using a hole saw cut the hole through the
metal on both sides of the foam part.
4. With a knife cut the foam out of the hole.
5. After the conduit is installed in the hole
caulk the entire perimeter of the hole on
both sides with an industrial grade silicone
sealant or a duct seal compound.
Disconnect
all
electrical
power
sources before servicing the unit.
More than one power source may be
provided. Failure to do so may result
in injury or death from electrical
shock or entanglement in moving
parts.
WARNING
The
foam
insulation
releases
dangerous fumes when it is burnt. Do
not cut a foam part with a cutting
torch or plasma cutter. Do not weld to
a foam filled part.
WARNING
Summary of Contents for M2 Series
Page 2: ......
Page 5: ...5 Split System Piping Diagrams 98 M2 Series Startup Form 115 Maintenance Log 121 ...
Page 35: ...35 Table 1 Electric and Gas Heating Capacities ...
Page 38: ...38 Figure 5 M2 Series Unit Four Point Lifting ...
Page 39: ...39 Figure 6 M2 Series Unit Eight Point Lifting ...
Page 58: ...58 Figure 32 Supply Fan Banding ...
Page 95: ...95 Figure 52 Filter Layout Viewed from the Upstream Side of the Cooling Coil ...
Page 98: ...98 Split System Piping Diagrams Figure 53 A C Split System Piping Suction Down ...
Page 99: ...99 Figure 54 A C Split System Piping Suction Up ...
Page 100: ...100 Figure 55 A C with LAC Split System Piping Suction Up ...
Page 101: ...101 Figure 56 A C with Modulating Hot Gas Reheat Split System Piping Suction Down ...
Page 102: ...102 Figure 57 A C with Modulating Hot Gas Reheat Split System Piping Suction Up ...
Page 103: ...103 Figure 58 A C with Hot Gas Bypass Split System Piping Suction Down ...
Page 104: ...104 Figure 59 A C with Hot Gas Bypass Split System Piping Suction Up ...
Page 107: ...107 Figure 62 Heat Pump Split System Piping Suction Down ...
Page 108: ...108 Figure 63 Heat Pump Split System Piping Suction Up ...
Page 109: ...109 Figure 64 Heat Pump with Modulating Hot Gas Reheat Split System Piping Suction Down ...
Page 110: ...110 Figure 65 Heat Pump with Modulating Hot Gas Reheat Split System Piping Suction Up ...
Page 111: ...111 Figure 66 Heat Pump with Hot Gas Bypass Split System Piping Suction Down ...
Page 112: ...112 Figure 67 Heat Pump with Hot Gas Bypass Split System Piping Suction Up ...