Refrigerant Relief Piping; Sound And Vibration Considerations - York YK Manual

FORM 160.75-EG1 (519)
Application Data (Cont'd)
Heat recovery allows you to utilize the heat, [which would otherwise be "wasted" (to the
cooling tower)], to serve a useful purpose. This heat of rejection can be used to:
• Preheat domestic hot water needs like in hotels or hospitals for use in:
• Laundry, showers, swimming pools, cooking/dishwashing, hot tub
• Comfort heating (perimeter heating)
• Reheating of air
• Preheating of boiler makeup water or process hot water
The main difference between a cooling only chiller and a heat recovery chiller is in the
heat recovery chiller's added ability to reject the "free condenser heat" to the cooling tower
and/or the heating system. Since heat is being removed from the area to be cooled, the
cooling load supports the heating load. There must be a simultaneous cooling and heat-
ing load in the building.
When using a Solid-State Starter or Variable Speed Drive for a heat recovery application,
the starters will be chilled water cooled.
Please refer to Form 160.75-AD2; YK Mod G Heat Recovery Application Data for addi-
tional information.
Heat Recovery Availability
Standard: Compressors Q4, Q7, H9, K2, K7

REFRIGERANT RELIEF PIPING

Each chiller is equipped with dual pressure relief valves on the condenser and two dual
relief valves on the evaporator, or two single relief valves on the evaporator if the optional
refrigerant isolation valves are ordered. The dual relief valves on the condenser are re-
dundant and allow changing of either valve while the unit is fully charged. The purpose
of the relief valves is to quickly relieve excess pressure of the refrigerant charge to the
atmosphere, as a safety precaution in the event of an emergency such as fire. They are
set to relieve at an internal pressure as noted on the pressure vessel data plate, and are
provided in accordance with ASHRAE 15 safety code and ASME or applicable pressure
vessel code.
Sized to the requirements of applicable codes, a vent line must run from the relief device
to the outside of the building. This refrigerant relief piping must include a cleanable, verti-
cal leg dirt trap to catch vent stack condensation. Vent piping must be arranged to avoid
imposing a strain on the relief connection and should include one flexible connection.

SOUND AND VIBRATION CONSIDERATIONS

A YK chiller is not a source of objectionable sound and vibration in normal air conditioning
applications. Neoprene isolation mounts are furnished as standard with each unit. Op-
tional level adjusting spring isolator assemblies designed for 1" (25 mm) static deflection
are available from Johnson Controls.
YK chiller sound pressure level ratings will be furnished on request.
Control of sound and vibration transmission must be taken into account in the equipment
room construction as well as in the selection and installation of the equipment.
44 JOHNSON CONTROLS