York YCAS0130 manual Installation, General Requirements

VIBRATION ISOLATORS

Optional sets of vibration isolators can be supplied loose with each unit.

Using the Isolator tables, refer to the Technical Data Section, identify each mount and its correct location on the unit.

Installation

Place each mount in its correct position and lower the unit carefully onto the mounts ensuring the mount en- gages in the mounting holes in the unit base frame.

On adjustable mounts, transfer the unit weight evenly to the springs by turning the mount adjusting nuts (located just below the top plate of the mount) counter-clockwise to raise and clockwise to lower. This should be done two turns at a time until the top plates of all mounts are between 1/4" and 1/2" (6 and 12 mm) clear of top of their housing and the unit base is level.

A more detailed installation instruction is provided in the Installation Instruc- tions for VMC Series AWR/AWMR and CP Restrained Mountings Section of this manual, (page 107).

SHIPPING BRACES

The chiller’s modular design does not require shipping braces.

PIPEWORK CONNECTION

General Requirements

The following piping recommendations are intended to ensure satisfactory operation of the unit(s). Failure to follow these recommendations could cause damage to the unit, or loss of performance, and may invalidate the warranty.

FORM 201.19-NM1 (204)

The maximum flow rate and pressure drop for the evaporator must not be exceeded at any time. Refer to the Technical Data Section for details.

The liquid must enter the evaporator at the inlet connection. The inlet con- nection for the evaporator is at the far end of the unit when viewed from the power and control panels.

Water inlet is always nearest the suc- tion gas outlet on the DX evaporators. (chiller barrel)

A flow switch must be installed in the customer pipework at the outlet of the evaporator and wired back to the control panel using shielded cable. There should be a straight run of piping of at least 5 pipe di- ameters on either side. The flow switch should be wired to Terminals 13 and 14 (see Figs. 13 and 14, pages 40 and 41). A flow switch is required prevent damage to the evaporator caused by the unit operating without adequate liquid flow.

The flow switch used must have gold plated contacts for low voltage/current operation. Paddle type flow switches suitable for 150 PSIG (10 bar) (optional 300 PSIG) working pressure and having a 1" N.P.T. con- nection can be obtained from YORK as an accessory for the unit. Alternatively a differential pressure switch sited across an orifice plate may be used, preferably of the high/low limit type.

The chilled liquid pump(s) installed in the pipework system(s) should discharge directly into the unit evapora- tor section of the system. The pump(s) may be controlled external to the unit - but an override must be wired to the control panel so that the unit can start the pump in the event that the liquid temperature falls below the minimum setting. For details refer to “Electrical Connection.”

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YORK INTERNATIONAL 31