Enclosure Air Conditioner RFQ Checklist

This checklist helps buyers organize an enclosure air-conditioner inquiry. It does not calculate final capacity for an unknown cabinet, approve refrigerant work or claim that any headline value on the EP-A family page applies to every model and operating point.

Buying Decision at a Glance

Decision input	Buyer must confirm	Evidence required
Heat load	Component losses and operating duty inside the cabinet	Loss schedule or documented measurement method
Temperature	Maximum permitted internal and worst external ambient	Equipment limits and site record
Cabinet	Dimensions, material, placement and surface exposure	Current drawing and installation layout
Cooling unit	Required capacity at the specified design point	Exact model performance data or selection output
Installation	Supply, cutout, airflow, condensate and service access	Exact drawing and installation instructions

Describe the Cabinet and Its Location

Provide overall dimensions, material, color where solar gain matters, door arrangement and whether the enclosure is freestanding, wall-mounted, recessed or joined to other cabinets. Surface heat exchange changes with installation position, so an outside dimension list alone is incomplete.

State indoor or outdoor location, altitude where relevant, nearby process heat, direct sun exposure, dust, oil mist, humidity, washdown or corrosive conditions. Use measured or project-defined conditions rather than a general statement such as “factory use.”

Build an Internal Heat-Loss Schedule

List heat released inside the enclosure by drives, power supplies, transformers, contactors, PLC equipment, semiconductors and other devices at the actual duty. Electrical input rating is not automatically equal to heat loss. Use manufacturer loss data or a documented engineering estimate.

Identify simultaneous operation, duty cycle and future additions. Keep uncertainty visible. An unrealistically low sum can undersize cooling, while adding every nameplate maximum without operating context can produce an unnecessarily large request.

Set the Temperature Objective

State the highest acceptable internal air temperature based on the installed equipment and the project design margin. Also provide maximum and minimum external ambient conditions. The requested setpoint should protect equipment, not imitate a comfort-cooling target.

If door opening, maintenance or humid air creates a condensation concern, describe it explicitly. The supplier needs to address condensate handling, but project personnel remain responsible for safe drainage and installation according to the exact instructions.

Request Capacity at the Design Point

Ask for the cooling capacity of the exact model at the specified internal and external temperatures. A nominal capacity stated at a different rating point is not a comparable answer. Request the curve, table or selection output that supports the proposed unit.

State whether the heat balance includes enclosure surface gain or loss and how it was calculated. Rittal technical guidance separates internal heat loss, surface heat transfer and required cooling output; its coefficients and products do not transfer automatically to this project.

Define Mounting, Supply and Service Constraints

Provide the preferred mounting position, available cutout area, weight or structural constraints, internal and external airflow clearances and hot-air discharge limitations. Include the supply voltage and frequency, control or alarm needs and the panel interface boundary.

Specify drain routing, maintenance side, filter or coil access and the clearance available for service. A unit that meets capacity but cannot be mounted, drained or maintained is not an acceptable technical match.

Build an Evidence File Before Approval

Create one review sheet for the proposed Enclosure Air Conditioner order code or system. Put project inputs in one column and supplier evidence in the other. Preserve the exact pages, drawings, curves and tables used in the decision, including their revision or retrieval date. A category page can establish product-family context, but an exact rating, connection or performance claim must trace to the quoted configuration.

Check that every accepted value describes the same orderable item. Similar housings can contain different circuits, supplies, terminals, airflow arrangements or accessories. Do not combine a family maximum from one variant, a drawing from another and an optional feature from a third. Mark unresolved fields explicitly instead of allowing them to disappear in the commercial quotation.

Control Changes During Sourcing

Keep the application record frozen while suppliers respond. If the load, voltage, environment, duty, enclosure, control method or required output changes, issue a revised record and ask each supplier to reconfirm the candidate. Otherwise two quotations may look comparable while answering different technical requirements.

A proposed substitute returns to the same evidence gate. Matching dimensions, a similar product photograph or one equal headline rating is not enough. The substitute must satisfy the required functions and conditions with its own exact documentation.

Common Procurement Errors

• Selecting Enclosure Air Conditioner from one headline rating while leaving the application context undefined.
• Using a curve, diagram or performance claim from a neighboring model.
• Comparing data measured under different voltage, temperature, airflow or duty conditions.
• Treating included accessories and system functions as obvious from a product name.
• Approving a substitution without reopening the technical evidence review.

Compare cooling offers at the same internal and external design temperatures. A nominal capacity figure is not enough if the quotation does not show the exact model's capacity at those conditions. Check cabinet heat loss, mounting space, condensate routing and the specified electrical supply before comparing price and lead time.

How to Compare Supplier Offers

Comparison point	Required evidence	Do not accept
Heat balance	Traceable losses and surface conditions	Cabinet volume or installed kW alone
Capacity	Exact model at specified indoor/outdoor temperatures	Single nominal cooling watt figure
Environment	Dust, humidity, solar and ambient record	“Indoor” or “outdoor” without conditions
Installation	Cutout, clearances, drain and supply confirmed	Model selected before cabinet layout
Documents	Curve, drawing and instructions for order code	Family brochure or product photograph

Normalize every Enclosure Air Conditioner offer to the same application record. Keep document revisions, test conditions and open questions beside each value. A proposal can remain commercially interesting while technically incomplete, but missing evidence must stay visible until it is resolved.

Decision Workflow

• Freeze the cabinet drawing and installed equipment list.
• Calculate or document internal heat loss at the intended duty.
• Set the maximum internal temperature and worst external ambient.
• Record environmental exposure and enclosure surface conditions.
• Request exact-model capacity, supply, mounting and condensate evidence.
• Resolve installation and maintenance constraints before commercial approval.

Start with the cabinet heat-loss schedule and target internal temperature. Add the worst external ambient and installation constraints, then ask each supplier to identify an exact model and provide capacity evidence for those conditions. A headline wattage or similar-looking cabinet unit does not close a missing data point.

RFQ Preparation Checklist

Identify unknown values as questions and require an exact orderable code rather than a generic family recommendation.

• Enclosure dimensions, material, placement and drawings
• Installed equipment and internal heat-loss schedule
• Target internal and maximum/minimum ambient temperatures
• Indoor/outdoor exposure, dust, humidity and solar conditions
• Required capacity at the defined design point
• Supply voltage/frequency, controls and alarm requirements
• Mounting position, cutout, clearances and condensate plan
• Quantity, destination and required document revision

Request the current datasheet revision and the scope of any certification, compatibility or performance claim. Record quantity and destination after the technical inputs so commercial terms do not obscure unresolved engineering questions.

Stop Conditions Before Order Release

Do not release the order while a critical application input is unknown, the quoted model is ambiguous, a required rating is supported only by another manufacturer’s document, or installation conditions fall outside the available evidence. These are engineering gaps, not editorial details.

The approval record should state what the selected item does, what remains outside its scope and which exact documents support the decision. If the application or candidate changes, reopen the affected checks rather than carrying the previous conclusion forward.

Frequently Asked Questions

Can cabinet volume determine air-conditioner capacity?

No. Heat load, surface heat exchange, ambient conditions and target temperature are required.

Should the RFQ request the largest available unit?

No. Request documented capacity at the design point and review control, energy and condensation consequences.

Is nominal capacity constant at every ambient temperature?

Do not assume so. Ask for exact-model performance at the specified internal and external conditions.

Related RITOKS Products and Guidance

Use these links as separate category, product and Resource records. A contextual link does not claim interchangeability, compatibility or an approved system combination.

Enclosure Air Conditioner product category

EP-A indoor enclosure air conditioners

Enclosure air conditioner selection guide

Technical References

The Rittal references below explain heat-balance and enclosure climate-control planning concepts used in this checklist. They do not verify an EP-A model's capacity, mounting cutout, electrical supply or condensate arrangement; request those details for the exact proposed unit.

Rittal, Technical System Catalogue: Cooling with Ambient Air

Supports separating internal heat loss, surface heat exchange, permissible temperature rise, airflow and environmental conditions. Rittal formulas and equipment data must be used only within their stated conditions.

Rittal, RiTherm Climate Control Planning

Supports needs-based enclosure climate-control planning from cabinet, heat-load and ambient inputs. It is not an exact RITOKS product selector.

Request an Exact-Model Review

Send the application requirements, exact documentation questions, quantity and destination through the RITOKS contact form. An RFQ requests an exact-model review; this guide does not approve a wiring design, installation or automatic substitute.

Contact RITOKS