York YVAA Installation Operation & Maintenance page 21

Form 201.47-ICOM1
Issue date: 17/11/2022
Dual Pressure Relief Valve – Two safety relief valves
are mounted in parallel; one is always operational to
assist in valve replacement during maintenance.
Terminal Block [not available for CE marked units]
Terminal Block connections must be provided at the
point of incoming single point connection for field
connection and interconnecting wiring to the compres-
sors. Separate external protection must be supplied,
by others, in the incoming power wiring, which must
comply with local codes.
Circuit Breaker – A unit-mounted circuit breaker with
external lockable handle will be supplied to isolate the
single point power voltage for servicing. The circuit
breaker is sized to provide motor branch circuit protec-
tion, short circuit protection and ground fault protec-
tion for the motor branch-circuit conductors, the motor
control apparatus and the motors.
Non-Fused Disconnect Switch – Unit-mounted dis-
connect switch with external lockable handle can be
supplied to isolate the unit power voltage for servicing.
Separate external fusing must be supplied by the power
wiring, which must comply with local codes.
JOHNSON CONTROLS
SECTION 2 - PRODUCT DESCRIPTION
Vibration isolation
Elastomeric Isolation – This option is recommended
for normal installations. It provides very good perfor-
mance in most applications for the least cost. Field
mounted.
25 mm (1 in.) Spring Isolators – Spring and cage
type isolators for mounting under the unit base rails
are available to support unit. They are level adjustable.
25 mm (1 in.) nominal deflection may vary slightly by
application. Field mounted.
50 mm (2 in.) Restrained Spring Isolators – Re-
strained Spring-Flex Mounting isolators incorporate
a rugged welded steel housing with vertical and hori-
zontal limit stops. Housings designed to withstand a
minimum 1.0g accelerated force in all directions up to
51 mm (2 in.). The deflection may vary slightly by ap-
plication. They are level adjustable. Field mounted.
2
21