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Minimum Bend Radius
5
2
"
6
w
"
8
a
"
3.
Place strainers at the inlet of each system circulating
pump.
4.
Select the proper hose length to allow slack between
connection points. Hoses may vary in length by +2%
to -4% under pressure.
5.
Refer to Table 2. DO NOT exceed the minimum
bend radius for the hose selected. Exceeding the
minimum bend radius may cause the hose to collapse
which reduces water flow rate. Install an angle
adapter to avoid sharp bends in the hose when the
radius falls below the required minimum as shown in
Figures 2 and 3.
Wrong
Right
Wrong
Right
Wrong
Right
Figure 3
Hose in Inches
1"
1
4
"
1
2
"
Table 2- Metal Hose Minimum Bend Radii
Insulation is not required on loop water piping except
where the piping runs through unheated areas or outside
the building. Because loop temperature is normally
between 60
°
F and 90
°
F, piping will not sweat nor suffer
heat loss in normal ambient conditions. For regions
outside of the 60
°
- 90
°
F range, refer to the job
specification to determine if the use of insulation is
specified.
Pipe joint compound is not necessary when Teflon
threaded tape is pre-applied to hose assemblies or when
flared-end connections are used. If pipe joint compound
is preferred, use compound only in small amounts on the
male pipe threads of the fitting adapters. Prevent sealant
from reaching the flared surfaces of the joint.
Maximum allowable torque for brass fittings is 30 foot-
pounds. If a torque wrench is not available, tighten
finger-tight plus one quarter turn. Tighten steel fittings
as necessary.
Ensure that the trap is filled with water before operating the
unit to avoid condensate pan overflow at initial start-up.
DO NOT bend or kink supply lines or hoses.
Optional pressure-rated hose assemblies designed
specifically for use with ClimateMaster units are
available. Supply and return hoses are fitted with swivel-
joint fittings at one end to prevent kinking during
installation.
Refer to Figure 4 for an illustration of a Supply/Return
Hose Kit. Male adapters secure hose assemblies to the
unit and risers. Install hose assemblies properly and
check them regularly to avoid system failure, reduced
service life and possible damage to surrounding furniture
and carpets.
Figure 2
Figure 4- Supply/Return Hose Kit
Corrosive system water requires corrosion-resistant
fittings and hoses and may require water treatment.
Condensate Piping
Units are typically installed directly above each other on
successive floors with condensate drains located near the
units.
Connect the unit condensate drain connection to the
building condensate drain with a 1" drain line.
The horizontal run of a condensate hose is usually too short
to cause drainage problems, however pitch the horizontal
run of the condensate line at least 1 inch for every 10 feet
of run in the direction of flow. Avoid low points and
unpitched piping since dirt collects in low or level areas
and may cause stoppage and overflow.
Install a condensate trap at each unit with the top of the trap
positioned below the unit condensate drain connection.
Figure 5 illustrates a typical trap and vent used with
LCU Heat Pumps. Design the length of the trap (water-
seal) based upon the amount of positive or negative
pressure on the drain pan. As a rule, 1" of trap is
required for each inch of negative pressure on the unit.
Rib Crimped
Length
(2 Foot Length Standard)
Swivel
Brass
Fitting
Brass
Fitting
MPT
!
CAUTION
