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Notes:
•
Rods must be perpendicular to the mounting
holes in the base rail of the horizontal unit.
•
For 0.75 to 6 ton EXHF and DXHF models,
follow pitching instructions from previous
generation IOM.
Figure 19. Hanging the unit
Condensate Drain Connection
Figure 20. Negative pressure system
Install proper trapping to the equipment. The unit drain
connection is 0.75 in. NPT for all DXH, DXV, and EXH/V
0.75 to 6 ton models.
When designing the condensate trap for the water-source
system, it is important to consider the unit draw-thru design
requiring negative pressure trapping.
In a properly trapped system, when condensate forms
during normal operation, the water level in the trap rises
until there is a constant flow. It is imperative to maintain
water in the trap and not allow the trap to dry out during
heating season. Keeping trap primed at all times will
enable the water to flow properly. See the figure above for
appropriate dimensions required in a negative pressure
system.
WSHP-SVX014J-EN
CLEAN OUT
(CAPPED and SEALED)
Supply Pipe Connections
Figure 21. Supply/return pipe connections
WATER-OUT
WATER-IN
AUTOMATIC BALANCING
Connect the supply and return hoses to the water-inlet
(from supply) and water-outlet (to return) of the unit. For
vibration isolation, it is recommended that flexible steel
braided hoses be installed instead of hard piping the
equipment to the main loop system. Figure above shows
connection of a Hays Mesurflo® balancing hose kit to the
water-in and water-out of a vertical unit.
Note: Above figure example incorporates the Hays
Mesurflo® balancing hose kit and a 2-position
isolation valve into the system design. An isolation
valve is often used in variable speed pumping
applications. The isolation valve is designed to stop
water flow to the unit during non operation times.
This allows the loop water pumps to run only when a
requirement for pumping is needed for greater
energy efficiency of the overall system design.
Cleaning and Flushing the Water
Loop
After the piping system is complete, the flexible hose
connectors should be doubled back to complete the water
circuit external to the unit (avoiding trash settle-out in the
condenser). An extra pipe may be necessary to connect
the hose kits.
1. Water circulation system should be filled with clean
water using the water make up connections.
Note: Air vents should be open during filling.
2. With the air vents closed, start the circulating pump and
then crack the air vents to bleed off the trapped air,
assuring circulation through all components of the
system.
Note: Make up water must be available to the system to
replace the volume formerly occupied by the air that
is bled off.
3. With the air vented and the water circulating, the entire
system should be checked for leaks with repairs made
as required.
4. Operate the supplementary heat system (boiler)
making checks per manufacturer's instructions. During
this operation, visual checks should be made for leaks
Installation
RETURN
TO
LOOP
SUPPLY
FROM
CENTRAL
PUMP
HOSE KIT
31
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