4
U-5 IOM
Electrical service and fuses
Warning:
Turn off electrical power before servicing
controls. Severe electrical shock may result unless
power is turned off.
Unit must be installed in compliance with NEC and
local codes.
Route wires through a properly sized disconnect
switch. Consult the wiring diagrams that are found in
this manual and inside the cover of the electrical box
to complete the connection. see nameplate for proper
fuse sizing, minimum circuit ampacity and voltage
requirements. An auxiliary electrical heater must be
installed with a power supply separate from the heat
pump.
All factory installed electric preheat coils require a
separate power supply. See the unit specification
sheet for more information.
Control wiring
All of the heat pump functions are controlled by
remote thermostat and must be wired as shown,
using approved 18-gauge copper wire.
Electric supply
Changing filters
The filters can be accessed from either side of the
unit. The filter access panels (see Figure 4) are held
in place by several sheet metal screws. After one of
the access panels have been removed the filters will
slide out.
The same access panel that allows access to the
standard 2-inch filters also allows access to the
optional 4-inch thick panel filters.
Figure 4. Access panels
Preheat Section
Filter Access Section
Optional hose kits
The flexible water hoses are 2-foot stainless steel
hoses for water connections to the heat pump and
adapters. Use two properly sized wrenches, one on
the unit FPT fitting and one on the hexagonal fitting
on the hose, when connecting hoses. Do not use
wrench on hose or sleeve that crimps the fitting onto
the hose. Hoses must not be subjected to stress of
being pulled taut, twisted or kinked. Connections
should not be over tightened.
Before pressurizing the water system, closely inspect
hoses and fittings to be sure there are no cuts,
abrasions, twists, kinks, stretch and hoses will not be
in contact with any sharp surface or edge while in
use. Also available for heat pumps is a condensate
hose and two hose clamps.
For Mammoth hose kit information as to installation
and specifications, see data sheets C-91 and C-93.