Condensate Drain; Duct System - Bosch QV Series Installation, Operation And Maintenance Manual

12 | Condensate Drain

Fig. 9 Threaded Rod
CONDENSATE DRAIN
A drain line must be connected to the heat pump
and pitched away from the unit a minimum of 1/8"
per foot to allow the condensate to flow away from
the unit.
This connection must be in conformance with local
plumbing codes. A trap must be installed in the
condensate line to ensure free condensate flow.
Units are not internally trapped.
A vertical air vent is sometimes required to avoid
air pockets. The depth of the trap depends on the
amount of positive or negative pressure that is on
the drain pan while the unit's fan is operating. A
second trap must NOT be included. (See Fig. 10.)
Fig. 10 Condensate Drain Installation

DUCT SYSTEM

All QV Series models are provided with a supply air
outlet collar and return air duct flange to facilitate
duct connections.
8733829041 (2021/07)
Supply air duct and return air duct flanges
are shipped unfolded with the unit. They
need to be folded. See "Return and Supply
Air Duct Flanges Preparation" on page #9 for
details.
Refer to unit Dimensional Drawings for physical
dimensions of the collar and flange. (See page
#51.)
A flexible duct connector is recommended for
supply and return air duct connections on metal
duct systems. In order to avoid heat loss or gain
and prevent condensate forming during the colling
operation insulate all metal ducting with a
minimum of 1" duct insulation. Application of the
unit to uninsulated duct work is not recommended
as the unit's performance will be adversely
affected.
The factory filter should be left in place on a free
return system.
For new or replacement market installations,
please refer to current ASHRAE procedures for
duct sizing to ensure proper unit's operation and
air distribution. If the duct system is too small,
larger duct work should be installed. Check for any
leaks in the existing duct work and repair as
needed.
The duct system and all diffusers must be sized to
handle the designed air flow quietly. To maximize
sound attenuation of the unit's blower, insulate
the supply and return air plenums. There should be
no direct straight air path through the return air
grille into the heat pump. The return air inlet to the
heat pump must have at least one 90 degree turn
away from the space return air grill. If air noise or
excessive air flow are a problem, the blower speed
can be changed to a lower speed to reduce air
flow.
NOTICE: Do not connect discharge ducts
directly to the blower outlet.
Subject to change without prior notice
QV Series Heat Pumps
QV Series Heat Pumps