Mounting Horizontal (Hz) Units - Bosch QV Series Installation, Operation And Maintenance Manual

10 | Horizontal (HZ) Units
Fig. 4 Straight-Through Orientation
To convert the supply air direction, follow the
steps below:
1. If connected to power, shut off the unit and
disconnect switch or circuit breaker.
2. Unscrew and remove the blower access panel.
3. Unplug power and control harness from motor
module.
4. Remove motor module mounting bracket with
module (sit on the divider).
5. Unscrew and carefully remove the blower
panel with the blower attached.
NOTICE: Be careful not to damage the
refrigerant coils or any other internal unit
components.
6. Turn the blower panel 180°.
7. Insert the blower panel with the blower and
motor into the desired location. Screw the
panel into place.
8. Reinstall motor module mounting bracket with
module in the previous blower location.
9. Reconnect the motor power and control
harness to the motor module. Make sure to
connect wires to the proper speed taps.
10. Reinstall the blower access panel.
11. Reconnect power to the unit.

Mounting Horizontal (HZ) Units

While HZ units may be installed on any level
surface strong enough to hold their weight, they
are typically suspended above a ceiling by
threaded rods. Attach the unit corners using a
hanging bracket kit supplied with the HZ units. The
rods must be securely anchored to the ceiling.
Refer to the hanging bracket assembly and
installation instructions for details.
8733829041 (2021/07)
NOTICE: Horizontal units installed above
the ceiling must conform to all local codes.
An auxiliary drain pan, if required by code,
must be at least four inches larger than the
bottom perimeter of the heat pump.
Plumbing connected to the heat pump must not
come in direct contact with building structure or
its components (such as joists, trusses, walls,
etc.).
Some applications require an attic floor
installation of the HZ unit. In those cases, the unit
must be set in a full-sized secondary drain pan on
top of a vibration absorbing mesh. The secondary
drain pan prevents possible condensate overflow
or water leakage damage to the ceiling. The
secondary drain pan is normally placed on a
plywood base isolated from the ceiling joists by
additional layers of vibration absorbing mesh. In
both cases, a 3/4" drain connected to this
secondary pan must be run to an eave at a location
that will be noticeable.
The HZ units condensate drain pans are NOT
internally sloped.
NOTICE: HZ units must be installed pitched
1/4"
connection in both directions to facilitate
condensate removal. (See Fig. 5.)
Fig. 5 Pitched Unit
Subject to change without prior notice
QV Series Heat Pumps
towards the condensate
QV Series Heat Pumps
drain