York YLAA Operation Manual page 9

Equipment Overview (Cont'd)
JOHNSON CONTROLS
BRAZED PLATE EVAPORATOR
The compact, high efficiency Brazed Plate Heat Exchanger (BPHE) is constructed with
316L stainless steel corrugated channel plates with a filler material between each plate. It
offers excellent heat transfer performance with a compact size and low weight, reducing
structural steel requirements on the job site.
The heat exchanger is manufactured in a precisely controlled vacuum-brazing process
that allows the filler material to form a brazed joint at every contact point between the
plates, creating complex channels. The arrangement is similar to older plate and frame
technology, but without gaskets and frame parts.
Water inlet and outlet connections are 3" in diameter and are grooved for compatibility
with field supplied ANSI/AWWA C-606 couplings.
A 20 mesh wye-strainer is provided as standard to provide protection at the evaporator
inlet, particularly at system start-up when construction debris may be present in the piping
system.
The evaporator is equipped with a thermostat-controlled heater. The heater provides
freeze protection for the evaporator down to -20°F (-29°C) ambient. The evaporator is
covered with 3/4" flexible, closed-cell, foam insulation (K=0.25).
A factory-wired flow switch is standard, installed in a pipe section at the outlet of the
evaporator.
FORM 150.72-EG6 (516)
LD18426
9