magicpak MGE4-12 Series, Инструкция по установке и обслуживанию, Страница: 13 / 22

508197-01 Issue 2137 Page 13 of 22
When proper duct design is applied, field-provided filters
up to MERV 6 can typically be installed in the unit’s factory
filter location in lieu of a washable filter. If a higher resistance
filter is field installed in the unit, the added resistance must
be included in the external static pressure and must not
exceed 0.5 in. w.c., including ductwork.
Condensate Drain
Provisions must be made to properly drain condensate
from the drain pan.
Condensate drain connection: 3/4” NPT to 3/4” PVC fitting
(schedule 40 minimum). Drain must be trapped as shown
in Figure 8. The drain line should pitch gradually downward
at least 1” per 10’ of horizontal run to open drain. Field
fabricated platform should be 4” minimum to allow for
proper trapping and drainage.
Use thread sealant on the threaded fittings. Install
threaded fittings by hand only. Do not over torque the
fittings.
CAUTION
If local codes require the use of metal condensate lines,
do not thread metal fittings into the unit drain pans. Thread
a PVC fitting into the unit drain pans and make the field
connection to the PVC fitting.
NOTE: These units are designed with a redundant drain
system to handle condensate without the need for a
secondary or emergency drain pan. Should the indoor coil
condensate drain system fail, all water is contained within
the unit and the flow is directed into the unit base pan.
From there it will drain into the condensate riser.
Figure 8. Condensate Drain Installation
Electrical Connections
All wiring must be done in accordance with the National
Electrical Code (NEC), ANSI/NFPA No. 70 (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°C minimum.
Run the 208 or 230 volt, single phase, 60 hertz electric
power supply through a fused disconnect switch and
connect to the unit as shown in the unit’s wiring diagram.
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).
The 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, and 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
(MCA) marked on the unit. Use copper conductors only.
Each unit must be wired with a separate branch circuit and
be properly fused.
Gas Supply and Piping
Refer to unit rating plate to make sure the furnace is
equipped to utilize the type of fuel that is being provided
(natural or propane).
Any conversion of a natural gas unit to propane gas
must be done by qualified personnel using a conversion
kit available from the manufacturer, following the
instructions in the conversion kit. If done improperly,
over-firing of the burners and improper burner operation
can result. This can create carbon monoxide which
could cause asphyxiation.
WARNING
Gas supply piping should be installed in accordance with
local codes and the regulations of the utility. Piping must
be of adequate size to prevent undue pressure drop.
Consult the local utility or gas supplier for complete details
on special requirements for sizing gas piping.
If local codes allow the use of a flexible gas appliance
connector, always use a new approved connector. Do not
use a connector which has previously serviced another
gas appliance.