2
U-5 IOM
Installation
Definition
Twin circuit 100% Outside Air unit with one fan outlet
and two independent refrigerant circuits.
Unit placement – ceiling hung
Mammoth’s 100% outside air heat pump can be
hung from the ceiling using the mounting rails
attached to the unit and with vibration isolation
grommets shipped inside the unit’s electric
compartment.
1. Fit the grommets into the
3
⁄
4
-inch diameter holes
on the mounting rails. Use
5
⁄
16
-inch or
3
⁄
8
-inch
threaded rods (supplied by others) to hang the
unit from the ceiling. Cover the entire bottom of
the 1
1
⁄
4
-inch diameter grommet with a washer
(supplied by others).
Figure 1. Ceiling-hung placement
Note:
Never attempt to raise, lower or adjust the
pitch of the unit by turning the units on the hanger
rods without first taking the weight of the unit
completely off the vibration isolation grommets.
2. Mount the unit with a 5-degree (maximum) pitch
toward the condensate drain connection. Outside
air units are available with an optional bottom drain
connection. In the ceiling-mounted arrangement
this option will allow for more effective condensate
removal.
3. See unit data sheet for dimensional information.
Unit placement – slab-mounted
Mammoth’s 100% outside air heat pump can also be
installed on a flat level surface. It is recommended
that vibration mounts be placed under the unit to
prevent transmission of vibrating to the building
structure. The standard side drain connection is
required in this arrangement.
See unit data sheet for further dimensional details.
Threaded Rod
(By Others)
Water Out
Water In
Low Voltage
Connection
Main Power
Connection
Mounting Rail
Mounting Rail
See Grommet
Detail
GROMMET DETAIL
Threaded Rod
(By Others)
Mounting Rail
Vibration Isolation Grommet
Washer (By Others) Must Cover
Entire Bottom of Grommet
Retaining Nuts
(By Others)
Base
Condensate Connection
