McQuay Chiller Service in Tampa Bay

If the nameplate says McQuay

If your chiller carries the McQuay name, ask three questions before any repair: who made it, who supports it today, and where its documentation lives. Those are service problems before they are mechanical ones, because manuals, parts catalogs and the original commissioning contractor may each lead somewhere different.

Start with the nameplate. Photograph it and write down the full model and serial number, the compressor type, the refrigerant and the charge, and any controller label. Then ask whoever services the machine which of those facts they have confirmed on site and which they have only inferred.

See Daikin's corporate chronology page for entries that use the McQuay name; the two below are copied from it, with the year the table gives each.

• Under 2009: “Development and testing facility is established at the Daikin McQuay Applied Development Center in the United States.” (source).
• Under 2010: “Daikin McQuay Solutions Plaza is established in the New York, U.S.A. to exhibit cutting-edge, large-scale air conditioning equipment” (source).

On this page, those entries are not read as a statement about the current support of any McQuay machine. Ask Daikin Applied which documentation it holds for your model.

MicroTech controls and manuals

A controller records what the machine has done between visits, which makes it the first place to look when the paperwork is missing. See Daikin Applied's Magnitude page for one set of manual titles and its Trailblazer page for another; both are copied here.

• Magnitude page manual titles: “Chiller MicroTech II Controls Protocol Information for BACnet - 15100 Chiller MicroTech II Controls for BACnet MS/TP and LonWorks - ED 15062” (source).
• Trailblazer page manual titles: “Chiller MicroTech for LonWorks - IM 968-6 Chiller MicroTech for Modbus - IM 969-7 Chiller MicroTech for BACnet IP - IM 966-6 Chiller MicroTech for BACnet MS-TP - IM 967-6” (source).

These are manual titles for the machines on those pages. Matching one to your machine takes the panel in front of you, so ask for the controller to be read there, then ask which manual belongs to it. Fault history, run hours and setpoint behavior are evidence the chiller has already collected, so ask who reads them.

Parts questions

Daikin Applied's parts page says: “Whether installing, maintaining or servicing equipment, we offer a complete line of quality aftermarket commercial HVAC parts and supplies to keep your system operating reliably and at peak efficiency.” (source).

The same page says: “To mitigate downtime, we have 80 locations (and counting) across North America and Canada to help you take care of your critical parts demand.” (source).

Blume has an account with Daikin Applied.

Treat those statements as a description of a channel, not of any particular McQuay part. Before a failure, ask which parts on your specific machine can be identified from the nameplate, how one would reach the site, and who gives you the date. Ask too what the building does while a part is on order. A short list of the components you expect to be slow, such as controller boards and drive components, belongs in the equipment record.

Refrigerant questions on an older machine

Read the refrigerant from the nameplate, and ask for the type and charge to go on the equipment record. Ask whether it is an HCFC, and ask what that means for leak repair, recovery and a replacement plan.

EPA's page on the phaseout of Class II ozone-depleting substances says of HCFCs: “only a few were commonly used. Historically, the most widely used included HCFC-22 (usually as a refrigerant)” (source).

The same EPA page says: “While most HCFCs have been phased out, there are some uses that continue, such as for servicing refrigeration and air-conditioning equipment and in fire suppression.” (source).

For newer refrigerant classes and what they change in a plant room, see the refrigerant transition page from our commercial team. If a machine is leaking, ask for that to be treated as a decision point, not a routine top-up, and ask for the leak to be found.

Looking after an older chiller with measurements

An older machine rewards a plan built on measurement. For an air-cooled unit, ask how the coils are cleaned and checked. For a water-cooled unit, ask who watches the condenser tubes, the cooling tower and the pumps, since the chiller leans on all three.

A readings log is the backbone. Whatever fields it holds, ask that they be taken the same way each visit, so that a drift stands out against the earlier lines. A record that spans several visits is what turns a repair-or-replace conversation from opinion into evidence.

Ask about outages as well: how the machine behaves when power returns, whether anyone has tested the restart, and who is called when it stays off.

Repair, or plan the replacement

With an older machine, the question of repair versus replacement is one to put to the records. Ask for trend history, leak history, controller condition, parts availability and the cost to the building of an outage, and ask for it in writing. Steady trends and a readable controller make repair the natural answer. A recurring leak, or a controller that no longer communicates with the building system, makes planning a replacement before it fails the more useful question.

Our capital planning page covers scheduling a chiller as a dated expense, and the chiller maintenance page lists the measurements behind the decision. The chiller system guide explains how the equipment works, and the chiller hub lists the other brands.

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