Installation manual

10
PREMIER INSTALLATION MANUAL
Boiler/Cooling Tower Closed Loop Systems
Boiler/Cooling Tower
The water loop is usually maintained between 60°F and 90°F. Premier units allow 25°F to 110°F EWT for proper heat-
ing and cooling operation.
To reject excess heat from the water loop, the use of a closed circuit evaporative cooler or an open type cooling tower
with a secondary heat exchanger between the tower and the water loop is recommended. If an open type cooling tower is
used without a secondary heat, continuous chemical treatment and fi ltering of the water must be performed to ensure the
water is free from damaging materials.
Water Piping Connections
Units should not be connected to the supply and return piping until the water system has been cleaned and fl ushed
completely. Supply and return water connections are standard female pipe thread on commercial units (1-inch swivel on
residential units). Never use fl exible hoses with an inside pipe diameter that is smaller than the water connections on the
unit and limit the hose length to 10 feet or less per connection. High-pressure fl exible hoses provide sound attenuation for
both normal unit operating noise and hydraulic pumping noise. Hard piping can also be brought directly to the unit although
it is not recommended since no vibration or noise attenuation can be accomplished.