No data center maintains its own chillers. Very few overhaul their own generators, service their own UPS or test their own fire suppression. Those systems are kept alive by other companies' engineers under contracts that were negotiated once, filed, and are consulted for the first time during an incident.
That is the wrong moment to discover what the contract actually says.
Our guide to managed versus unmanaged colocation covers service levels in the other direction, what a provider owes a tenant. This is the layer underneath: what the facility's own vendors owe the facility.
What is normally under contract
A typical site carries several of these, usually with different vendors, different renewal dates and different terms:
- Chillers, CRAC or CRAH units and the associated controls
- Generators, including fuel system and transfer equipment
- UPS systems and battery strings, frequently split between the two
- Fire detection and suppression, where inspection is often a legal obligation rather than a choice
- Switchgear and protection, including periodic testing
- Building management and monitoring systems
- Water treatment where there is an evaporative system, which our guide to cooling water treatment covers
The fragmentation is the first problem. Nobody owns the whole picture, renewals arrive separately, and the gaps between scopes are where things live that no vendor believes are theirs.
The classic orphan is the interface. The generator vendor covers the set, the electrical contractor covers the switchgear, and the transfer switch between them belongs to whichever one is not in the room. The same applies to controls spanning two systems, and to anything installed by a third party during a later fit-out. Those items are worth listing explicitly rather than assuming they fall inside a scope boundary.
The terms that decide what you actually bought
Response, attendance and restoration are three different things
The headline number in most contracts is a response time, and it usually commits the vendor to answering the telephone or dispatching somebody — not to arriving, and not to fixing anything.
A contract worth having separates the three and attaches a commitment to the ones that matter. If it does not, assume the weakest interpretation, because that is the one that will be argued at two in the morning. Ask plainly where the responding technician is dispatched from, since a four-hour commitment from a city five hours away is a number rather than a service.
Parts and labor, and the exclusion list
Labor-only cover includes the engineer's time and bills every component. Parts-and-labor folds components in at a higher annual fee and removes the variance.
The comparison is decided by the exclusion list rather than by the headline. Major components — compressors, alternators, battery strings, main boards — are frequently excluded from parts cover, and those are precisely the failures that produce a large invoice. Read the exclusions before the price.
Who holds the spares
For short-lead components it hardly matters. For long-lead items it is the whole of the contract's value, because a vendor's regional stock is not reserved for you unless the contract says so. A part that is physically on your site, or contractually allocated and auditable, is protection. A part that is theoretically available is not.
Where spares are held on site, agree who owns them and what happens when the contract ends. Vendor-owned stock sitting in your store is convenient until the relationship ends and it leaves with them, which is a poor moment to discover the arrangement.
Scheduled maintenance that fits the facility
Preventive visits are the routine half of the contract and the half that collides with operations. The visit requires equipment to be taken out of service, which on a redundant system means running on reduced resilience for its duration.
That has to be planned, not absorbed. Our guide to change management and method statements covers the approval process, and a service contract that commits to visit frequency without reference to your windows will generate friction every quarter.
Escalation, and who the vendor may ignore
Contracts name the parties who can raise a call. When the person on site at midnight is not one of them, the escalation path runs through somebody asleep. Make sure the named contacts match who is actually present, and that the list is updated when staff change — our guide to staffing and shift models covers how thin overnight cover usually is.
The overlap with the construction warranty
New facilities routinely pay twice. During the defects liability period the installing contractor is already obliged to put faults right, and a full service contract running alongside it duplicates that obligation for a year or more.
The fix is to align the start date with the warranty expiry and to know what the warranty actually covers, which is a documentation question. Our guide to what you should receive at handover covers the records that make this answerable rather than a matter of recollection.
There is a trap in the other direction too. Some manufacturer warranties are conditional on maintenance being performed by an approved party at a defined interval. Letting a contract lapse, or using a cheaper independent, can void cover on equipment that is still within its warranted life. Check the condition before switching vendor on price.
Measuring whether the contract is working
Most sites renew on relationship and invoice size rather than on performance, because nobody is recording performance.
Four things are worth logging, and all of them are cheap to capture at the time: when each call was placed and when somebody actually arrived; whether the fault was cleared on the first visit or needed a return; whether scheduled visits happened in the window they were due; and whether the written report arrived at all. That last one is a reliable proxy for everything else — a vendor whose reports are late or absent is usually weak elsewhere too.
A year of that record turns renewal from an assertion into a conversation, and it is the only basis on which a price increase can be argued.
It also changes what you are buying. A vendor who consistently attends quickly and closes on the first visit is worth more than one who does not, and without the record both look identical on an invoice. The log is the only thing that lets you pay for performance rather than for habit.
Practical steps
Put every contract on one sheet with its scope, renewal date, response commitment, exclusions and named contacts. The exercise itself usually finds something: an expired agreement, a system nobody covers, or two vendors who each believe the other handles the controls.
Then read the exclusion lists rather than the headline rates, confirm where the responding engineer travels from, align new-build contracts to warranty expiry, and start logging response and attendance separately from today.
None of this is complex. It is simply work that produces no visible benefit until the night it decides whether help arrives in an hour or on Tuesday.
Operators who would rather not manage a vendor portfolio can place equipment in a facility that already does. Talk to our team about colocation and hosting at Rax.
Frequently Asked Questions
What is the difference between parts-and-labor and labor-only cover?
Labor-only means the vendor's time is included and every component is billed separately. Parts-and-labor folds components into the fee. The second costs more annually and removes the variance, which matters for budgeting on aging plant. The detail that decides the value is the exclusion list: major components such as compressors, alternators and battery strings are frequently carved out of parts cover, which can make the two options closer than they appear.
What does a four-hour response time actually commit the vendor to?
Usually to a telephone response or to a technician being dispatched, not to a technician being on site and certainly not to the fault being cleared. The useful contract distinguishes response from attendance from restoration, and states which of them the number applies to. If it does not, assume the weakest reading, because that is the one that will be argued.
Should the vendor hold our spares, or should we?
It depends on the lead time, not on the price. For components that are quick to source locally, vendor-held stock is fine. For long-lead items the only meaningful protection is a part that is physically on your site or contractually reserved for you, because a vendor's regional stock is allocated to whoever calls first.
How do these contracts interact with the construction warranty?
They overlap, and the overlap is routinely paid for twice. During the defects liability period the installer is already obliged to rectify faults, so a full service contract starting on day one can duplicate that cover. Align the start date with the warranty expiry, and make sure the handover documentation records what the warranty actually includes.
A Real Energisation Date, Not a Brochure
Rax operates where transmission investment has run ahead of load, and we are direct about staged capacity and real dates. Talk to our team about sizing a deployment against a timeline.
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