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7. Condensate piping can be steel, copper or PVC. Each
unit includes a condensate connection.
8. The condensate disposal piping must be trapped. The
piping must be pitched away from the unit not less than
1
⁄4" per foot. The unit has a 3/4 inch female pipe fitting
on each water source heat pump to accommodate the
condense drain connection. Factory supplied conden
-
sate hose assemblies have a pipe thread fitting to facili-
tate connection of a flexible vinyl or steel braided hose.
A complete copper or PVC condense system can be
Figure 5. (Sizes 007 through 070 shown)
Figure 6. Condensate disposal trapping detail
Ball
Valves
Supply
Riser
Return
Riser
Condensate
Riser
Supply Air
Optional Field
Installed Vent
1
1
⁄2"
(38 mm)
1
1
⁄2"
(38 mm)
Hanger Kits (4)
Flex Hoses
Electrical Access Panel
1
⁄4" Per Foot
(21 mm Per
Meter)
used. Union fittings in the copper or PVC lines should
be applied to facilitate removal.
9. Do not locate any point in the drain system above the
drain connection of any unit.
10. Automatic flow controlled devices must not be installed
prior to system cleaning and flushing.
11. A high point of the piping system must be vented.
12. Check local code for the need for dielectric fittings.
Cleaning & Flushing System
1. Prior to first operation of any conditioner, the water
circulating system must be cleaned and flushed of all
construction dirt and debris.
If the conditioners are equipped with water shutoff
valves, either electric or pressure operated, the supply
and return runouts must be connected together at each
conditioner location. This will prevent the introduction of
dirt into the unit. See Figure 7.
Figure 7. Supply & return runouts connected together
2. Fill the system at the city water makeup connection with
all air vents open. After filling, close all air vents.
The contractor should start main circulator with the
pressure reducing valve open. Check vents in sequence
to bleed off any trapped air, ensuring circulation through
all components of the system.
Power to the heat rejector unit should be off, and the
supplementary heat control set at 80°F (27°C).
While circulating water, the contractor should check
and repair any leaks in the piping. Drains at the lowest
point(s) in the system should be opened for initial flush
and blowdown, making sure city water fill valves are set
to make up water at the same rate. Check the pressure
gauge at pump suction and manually adjust the makeup
to hold the same positive steady pressure both before
and after opening the drain valves. Flush should continue
for at least two hours, or longer if required, to see clear,
clean drain water.
3. Shut off supplemental heater and circulator pump and
open all drains and vents to completely drain down the
system. Short circuited supply and return runouts should
now be connected to the conditioner supply and return
connections. Do not use sealers at the swivel flare con
-
nections of hoses.
4. Trisodium phosphate was formerly recommended as a
cleaning agent during flushing. However, many states
and localities ban the introduction of phosphates into
their sewage systems. The current recommendation is to
simply flush longer with warm 80°F (27°C) water.
Return Runout
Supply Runout
Mains
Flexible Hose
Runouts Initially
Connected Together
Note: Do not overtorque fittings. The maximum torque without damage to fittings is 30 foot pounds. If a torque wrench is not available, use as a rule of thumb,
finger-tight plus one quarter turn.
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