7
units only)
Each refrigeration circuit consists of an adjustable direct acting water regulating valve. The valve is
a pressure actuated modulating valve that is suitable for either closed or open systems. This valve is
primarily used to regulate the flow of water or glycol to the water-cooled condenser in each
refrigerant circuit. By regulating the flow to the condensers the refrigerant circuit maintains
constant head pressure.
CONDENSER
The condensers are of the coaxial
type and capable of operating @
300 psi waterside and 600 psi
refrigerant side. These condensers
require no maintenance.
If the condenser is of the tube and
shell type, a manufacture’s catalog
for maintenance and service is
supplied at the end of manual.
THERMOSTATIC EXPANSION
VALVES
This unit is equipped with thermostatic expansion valves (TEV) that control the flow of liquid
refrigerant entering the direct expansion (DX) evaporator by maintaining a constant superheat of
the refrigerant vapor at the outlet of the evaporator.
(KHP only)
NOTE: This unit is equipped with 2 thermal expansion valves per circuit. One is controlling
the flow to the evaporator in cooling mode and one is controlling the flow to the condenser
(evaporator in heating mode). This unit does not come with bi-flow expansion valves.
FILTER-DRIERS
This unit is equipped with two reversible heat pump filter driers per refrigerant circuit. The filter-
driers operate in either flow direction of the refrigerant circuit. The filter-driers consist of one core
in a shell with two check valves at either end. These check valves control the flow, so filtration
occurs on the outside of the core, regardless of the flow direction. The filter-driers do not release
the dirt collected in one mode when the flow direction reverses. The filter-driers are installed in the
reversing liquid line of each circuit.
