Technical data

Page 7
PITCH DOWN TO DRAIN
1/4" PER FOOT
2”
1”
VENT
When Necessary
UNIT
RECOMMENDED TRAP DIMENSION
Figure 5 illustrates a typical trap and vent used with
HS/HL/HP & VS/VL/VP Heat Pumps. Design the
length of the trap (water-seal) based upon the amount of
Figure 5. Condensate Drain
negative pressure on the drain pan. As a rule, 1" of trap
is required for each inch of negative pressure on the unit.
Each unit must be installed with its own individual trap
and connection to the condensate line (main) or riser.
Provide a means to flush or blow-out the condensate
drain line. DO NOT install units with a common trap
and/or vent.
Install a vent in the condensate line of any application
which may allow dirt or air to collect in the line. Always
vent when the application requires a long, horizontal run,
when some sagging in the condensate line may be
anticipated (as in a long line of plastic pipe) or when
"double trapping" may occur. Also vent when large
units are working against higher external static pressure
than other units connected to the same condensate main
since this may cause poor drainage for all units on the
line. When a vent is installed in the condensate line, it
must be located after the trap in the direction of
condensate flow.
Hanging or Mounting a Horizontal Unit
Horizontal heat pumps are typically suspended above a
ceiling or within a soffit using field-supplied, threaded
rods sized to support the weight of the unit.
A mounting kit including four (4) mounting brackets and
four (4) vibration isolators is shipped inside the blower
compartment of each unit.
Refer to Figure 6. Attach brackets and isolators to the
bottom corners of the unit. Use four (4) field-supplied
threaded rods to suspend the unit. Hang the unit clear of
the floor slab above and support the unit by the
mounting bracket assemblies only. DO NOT attach the
unit flush with the floor slab above.
Figure 6. Hanger and Vibration Isolation Kit
To avoid condensate overflow in Horizontal Units:
Horizontal Units sizes 006-030 must be hung level to
ensure proper condensate drainage. Horizontal Units sizes
036-120 must be hung pitched 1/4" to 1/2" toward the
condensate drain connection to ensure proper drainage.
Follow clearance guidelines described in the Location
and Access section of this manual. Provide adequate
clearance within the plenum for filter removal. When the
unit is installed with a return air plenum, provide a slot to
remove the filter.
Vibration
Isolator
3/8" Threaded
Rod (By Others)
Hanger
Washer &
3/8" Hex Nut
(By Others)
Slot used for installation of
hangers with 096 and 120
models only. Screws used
must be 1/2" or less in length
Notes: 1. Kits shipped unassembled and bulk-packed (4
hanger assimblies per unit) 2. Total head space
required = unit height + 1/2 inch + condensate
trapping. 3. See unit dimensional drawings for further
information.
Sound Attenuation for Horizontal Units
Sound minimization is achieved by correct placement of
the unit. Place the units so principal sound emission is
outside the occupied, sound sensitive space.
Note: If a fire wall is penetrated, a fire damper may be
required by local codes.
Lowest sound levels are obtained if the discharge duct has
at least one 90˚ bend and the return is ducted. All ducts
should be internally insulated