10
Installation, Operation & Maintenance - HKV Series
• On units with multiple fan outlets a “pair of pants”
duct connection must be used for proper air balance
and distribution and to prevent fan oscillation.
• Include at least one 90-degree turn in supply air ducts
to reduce noise transmission.
• Existing ducts must be checked to ensure proper
size and configuration prior to installation of any
replacement unit. Also inspect for and repair all air
leaks in existing ducts.
• Units may only be connected to a dedicated duct
system. Consult the factory BEFORE connecting
multiple units to a common duct system.
• Never connect a unit to a duct system with automatic
or modulating dampers, VAV boxes, etc. in the supply
air system. Never allow a situation where the total unit
CFM can drop below the minimum required for proper
unit operation.The VAV equipped HKV unit is for
connection to a single zone duct system.
• Never connect a bypass damper from the supply air
duct to the return air duct. Never allow the return air
temperature to drop below the minimum allowable
normal temperature for proper unit operation.
• Do not use HKV units for 100% outdoor air treatment.
Do not add hot-gas-bypass to “convert” a unit
for outdoor air treatment. Always use a dedicated
outdoor air unit for outdoor air treatment.
• Do not exceed 10% of the total unit CFM with
untreated outdoor air. Mixed air entering unit must be
less than 95/75F in cooling mode and greater than 60F
in heating mode.
