Magic-pac MHP4 Series Installation And Maintenance Instructions Manual page 7

a kit (see ACCESSORIES on page 11). Thread the 1/2"
end of the nipple into the unit drain pan and make the field
connection to the 3/4" end.
Fresh Air Intake (Fresh Air Models Only)
On fresh air capable models (designated by the FA in the
model number – 7MHP4-10-30FA-1), up to 5% fresh air is
drawn into the unit from outside when the indoor blower
comes on.
The location of fresh air capable models must conform
to the requirements of National Fire Protection
Association NFPA No. 54 in regards to proximity of
forced air inlets to flue gas terminals. Improper
installation could result in personal injury or death.
To access the fresh air intake feature, the threaded cap must
be removed from the fresh air intake pipe (see Figure 6). The
fresh air intake pipe is located at the rear of the unit return air
intake. When not in use, cap should be placed nearby in the
air intake area in case it is needed in the future.
Fresh Air Intake Pipe and Cap
Threaded Cap
Fresh Air Intake Pipe
Thermostat
The room thermostat should be located on an inside wall where
it will not be subject to drafts, sun exposure, or heat from
electrical fixtures or appliances. Follow manufacturer's
instructions enclosed with the thermostat for general
installation procedures. Color-coded insulated wires (#18
AWG) should be used to connect the thermostat to the unit.
506325-01
WARNING
Figure 6
Electrical Connections
All wiring must be done in accordance with the National
Electrical Code (NEC), ANSI/NFPA No. 70 (latest edition);
Canadian Electrical Code CSA C22.2 Part 1 (latest edition);
or local codes, where they prevail. Any alteration of internal
wiring will void certification and warranty.
Units are factory wired for a 230 volt power supply. If power
supply is 208 volts, it will be necessary to change a wire
connection on unit transformer from 240 volt terminal to 208
volt terminal as shown on the wiring diagram.
Use wiring with a temperature limitation of 75°F minimum.
Run the 208 or 230 volt, 60 hertz electric power supply
through a fused disconnect switch to the control box of the
unit and connect as shown in the wiring diagram located on
the inside of the control access panel.
The unit must be electrically grounded in accordance with
local codes or, in the absence of local codes, with the National
Electrical Code ANSI/NFPA No. 70 (latest edition) or CSA
C22.2 Part 1 (latest edition).
Power supply to the unit must be NEC Class 1 and must comply
with all applicable codes. A fused disconnect switch should
be field provided for the unit. The switch must be separate
from all other circuits. If any of the wire supplied with the unit
must be replaced, replacement wire must be of the type shown
on the wiring diagram. Electrical wiring must be sized to
minimum circuit ampacity marked on the unit. Use copper
conductors only. Each unit must be wired with a separate
branch circuit and be properly fused.
NOTE: Some MHP4 models require two separate power
supply circuits. See the unit wiring diagrams and rating
plates for specifications.
Issue 0941 Page 7 of 18