{"id":4503,"date":"2026-10-29T09:00:00","date_gmt":"2026-10-29T09:00:00","guid":{"rendered":"https:\/\/www.paradigmcooling.co.za\/articles\/?p=4503"},"modified":"2026-10-30T11:45:38","modified_gmt":"2026-10-30T11:45:38","slug":"commissioning-a-new-cold-room","status":"publish","type":"post","link":"https:\/\/www.paradigmcooling.co.za\/articles\/2026\/10\/29\/commissioning-a-new-cold-room\/","title":{"rendered":"Commissioning a New Cold Room: The Checks That Prevent Callbacks"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">A cold room that reaches temperature on day one and gets handed over is not the same thing as a cold room that has been properly commissioned. The checks that actually prevent callbacks \u2014 pull-down under load, superheat and subcooling against design, defrost proven to initiate and terminate, alarms proven to fire \u2014 take a few extra hours and get skipped more often than they should. This article sets out the commissioning sequence that catches the faults before the client does, with the number to check at each step and what an out-of-range reading means.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pull-Down Test: Empty, Then Loaded<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Run the pull-down test twice: once with the room empty to confirm the system can reach set point at all, and once loaded with product (or a representative heat load) to confirm the system can hold set point under the conditions it will actually operate in.<\/li><li>Record ambient temperature at the start of the test \u2014 a room commissioned on a mild day and never tested against a hot Cape Town summer afternoon (design ambients in the high 20s to low 30s\u00b0C are typical for local sizing) has not been tested against its real worst case.<\/li><li>Compare pull-down time against the design figure from the original load calculation and condensing unit sizing rather than an arbitrary number \u2014 a room that takes noticeably longer than its design pull-down time under load has a capacity, airflow, or charge problem that needs resolving before handover, not after.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Superheat and Subcooling Against Design<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Measure superheat at the evaporator outlet and subcooling at the condenser outlet, and compare both against the specific design figures for the installed system and refrigerant \u2014 not a generic rule of thumb, since the correct target depends on the metering device, refrigerant, and design conditions.<\/li><li>As a general planning range, expect superheat commonly in the region of 4 to 8 K on a properly set TXV system, with fixed-orifice systems often designed to a different, wider target \u2014 confirm the actual design value from the equipment manufacturer&#8217;s documentation before treating any reading as right or wrong.<\/li><li>Subcooling out of range points in a specific direction: low subcooling suggests undercharge, high subcooling suggests overcharge or a restriction. Record the actual charged weight against the nameplate charge as a cross-check.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Evaporator TD Measurement<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Confirm TD (room air temperature minus evaporator saturation temperature) matches the design intent: roughly 5 to 7 K where humidity must be preserved, roughly 7 to 10 K for general storage.<\/li><li>A TD measured well outside this range at commissioning, before the room has any operating history, is a sign of an airflow, charge, or coil sizing problem baked in from day one \u2014 far cheaper to correct now than after the room is loaded with stock and the client is depending on it.<\/li><li>Record the as-commissioned TD in the handover documentation so any future drift has a baseline to compare against.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Defrost Initiation and Termination \u2014 Prove It Actually Works<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Do not take the defrost schedule on trust. Force a manual defrost cycle and confirm it actually initiates, runs the heaters (measure current draw at the contactor), and terminates on the coil sensor at its set temperature \u2014 commonly in the region of 4 to 10\u00b0C, with a fail-safe maximum time of roughly 30 to 45 minutes as backup.<\/li><li>Confirm the fail-safe timer itself works by checking its setting against the controller configuration, even though you would not want to prove it by letting a real cycle run to the fail-safe limit.<\/li><li>Log the first several automatic defrost cycles after handover and check termination temperature and duration are consistent cycle to cycle \u2014 an inconsistent pattern in the first days of operation is much easier to diagnose before the room is fully loaded.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Door Heaters and Alarms<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Confirm door and frame heaters are powered and drawing current within roughly 10% of their rated value, matched to the door size and the local dew point rather than a generic assumption.<\/li><li>Test the high-temperature alarm by creating a genuine temperature rise (propping the door, or disconnecting the compressor briefly under controlled conditions) rather than only checking the alarm set point on a screen. Confirm the alarm fires within its configured delay \u2014 commonly 15 to 30 minutes of sustained excursion above set point \u2014 and that it reaches whoever is supposed to receive it, whether that is a local siren, an SMS, or a monitoring service.<\/li><li>Test the power-failure alarm the same way, given how often load shedding interrupts supply locally \u2014 confirm it reports both the outage and the recovery, not just one of the two.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Drain Lines: Trapped and Heated Where Required<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Confirm drain lines are properly trapped to stop cold air being drawn back up into the room, and that any run passing through a freezer wall or cold void has trace heating fitted and powered \u2014 commonly 15 to 20 W per metre for this application.<\/li><li>Run water through the drain during commissioning and confirm it clears fully with no standing water in the pan, and check the pipe fall (a minimum of roughly 1:100 is a reasonable target) rather than assuming gravity alone will be enough.<\/li><li>This check is easy to skip because it has no visible symptom on day one \u2014 a failed drain heater or a blocked line typically shows up weeks or months later as ice building back up on the coil, by which point it is a callback rather than a five-minute commissioning check.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Running Current Against Nameplate<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Record actual running current for the compressor, condenser fans, and evaporator fans, and compare each against its nameplate full-load current. A reading within roughly 10% of nameplate is normal; a reading noticeably above nameplate under normal load conditions points to a mechanical, electrical, or refrigerant-side problem that should be resolved before handover rather than left as a known issue.<\/li><li>Any electrical measurement or panel work should be carried out by a qualified person with the isolator locked off, and with awareness that some components (start capacitors, in particular) can hold a stored charge after power is removed.<\/li><li>Keep this reading as the commissioning baseline \u2014 a rising current draw over time, compared against this figure, is one of the earliest signs of a developing mechanical or refrigerant fault.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Set Points and Handover Documentation<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Document every set point explicitly: room temperature set point and differential, defrost schedule and termination temperature, high and low alarm thresholds and delays, and door heater control settings. A verbal handover is not a record.<\/li><li>Include the as-commissioned superheat, subcooling, TD, and running current readings in the handover pack, alongside the pull-down test results for both the empty and loaded conditions.<\/li><li>This documentation is what turns a future callback into a five-minute comparison against a known baseline, instead of a technician starting from zero on a room they have never seen before.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Commissioning Checklist at a Glance<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Check<\/th><th>What to verify<\/th><th>Target \/ typical figure<\/th><th>What out-of-range means<\/th><\/tr><\/thead><tbody><tr><td>Pull-down, empty<\/td><td>Time to reach set point<\/td><td>Per design calculation<\/td><td>Slower than design suggests capacity or airflow issue<\/td><\/tr><tr><td>Pull-down, loaded<\/td><td>Time to reach and hold set point under load<\/td><td>Per design calculation<\/td><td>Confirms system copes with real operating conditions<\/td><\/tr><tr><td>Superheat<\/td><td>At evaporator outlet<\/td><td>Per manufacturer design figure<\/td><td>Out of range signals charge or metering fault<\/td><\/tr><tr><td>Subcooling<\/td><td>At condenser outlet<\/td><td>Per manufacturer design figure<\/td><td>Low suggests undercharge; high suggests overcharge\/restriction<\/td><\/tr><tr><td>Evaporator TD<\/td><td>Room temp minus coil saturation temp<\/td><td>5\u20137 K (humidity-sensitive) or 7\u201310 K (general)<\/td><td>Out of range at commissioning is a built-in fault<\/td><\/tr><tr><td>Defrost termination<\/td><td>Coil sensor cut-out temperature<\/td><td>4\u201310\u00b0C, fail-safe 30\u201345 min<\/td><td>Confirms defrost actually clears the coil<\/td><\/tr><tr><td>Door heater current<\/td><td>Draw vs rated value<\/td><td>Within ~10% of nameplate<\/td><td>Under-draw signals a failed or undersized heater<\/td><\/tr><tr><td>High-temp alarm<\/td><td>Time to fire under real excursion<\/td><td>Commonly 15\u201330 min delay<\/td><td>Confirms alarm reaches the right person in time<\/td><\/tr><tr><td>Drain fall and heating<\/td><td>Pipe fall and trace heater current<\/td><td>~1:100 fall; 15\u201320 W\/m heating<\/td><td>Poor fall or failed heater causes future ice build-up<\/td><\/tr><tr><td>Running current<\/td><td>Compressor and fans vs nameplate<\/td><td>Within ~10% of nameplate<\/td><td>High draw signals a developing fault at handover<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Final Thoughts<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Every check in this sequence exists because it catches a fault that is cheap to fix during commissioning and expensive to fix as an emergency callback three months later, once the room is fully stocked and the client has stopped tolerating downtime. Test under load, prove defrost and alarms actually function rather than trusting the configuration screen, and hand over a documented set of baseline readings rather than a room that merely reached temperature once. For the complete context of how these checks fit into the whole system, see the <a href=\"https:\/\/www.paradigmcooling.co.za\/hvacr-learning-library\/commercial-cold-room-systems-the-complete-guide-to-design-installation-maintenance-and-troubleshooting\/\">complete guide to commercial cold room systems<\/a>. If you are sizing the condensing unit before you ever get to commissioning, see <a href=\"https:\/\/www.paradigmcooling.co.za\/articles\/how-to-size-a-cold-room-condensing-unit\/\">how to size a cold room condensing unit<\/a>, and if the envelope itself needs checking before you trust any of these readings, see <a href=\"https:\/\/www.paradigmcooling.co.za\/articles\/cold-room-panel-insulation-what-fails\/\">cold room panel insulation: what fails and how to spot it<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you need a cold room built, repaired or maintained, see our <a href=\"https:\/\/www.paradigmcooling.co.za\/commercial-refrigeration-cold-rooms-cape-town\/\">commercial refrigeration and cold rooms<\/a> page.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A cold room that reaches temperature on day one and gets handed over is not the same thing as a cold room that has been [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[38,19],"tags":[],"class_list":["post-4503","post","type-post","status-publish","format-standard","hentry","category-cold-room-systems","category-refrigeration"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - 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