Multispan's CC series are digital refrigeration controllers that switch and protect compressors in cold rooms, chillers and display cabinets. Models CC 510 to CC 552 differ by compressor relay rating — 10 A or 20 A — and added alarm, buzzer or dual-compressor outputs.
What is a Multispan CC-series refrigeration controller?
A Multispan CC-series controller is a digital, panel-mounting thermostat that switches and protects a refrigeration compressor based on temperature from an NTC probe. Made by Multispan Control Instruments (India, established 1986), the CC ("Cryo Controller") range — CC 510, CC 512, CC 515, CC 520, CC 522, CC 525 and CC 552 — replaces mechanical thermostats in cold rooms, bottle coolers, deep freezers, chillers and display cabinets. All models share a 3-digit 0.56-inch LED display, a 10 kΩ NTC sensor reading −50 to 99.9°C, ON-OFF control with adjustable hysteresis and offset, a compressor start delay and timed defrost. Individual models add alarm relays, buzzers or a second compressor stage. Al Misbah Al Sehri stocks the genuine, CE-certified range in Dubai for the UAE and GCC.
How do the Multispan CC models differ (CC 510 vs 512 vs 515 vs 520 vs 522 vs 525 vs 552)?
The main difference is the compressor relay rating and the number of auxiliary outputs. CC 510 is the base single-stage model with one 10 A compressor relay (1 C/O). CC 512 adds a 10 A alarm relay; CC 515 instead adds a 12 V DC buzzer. Stepping up in load, CC 520 gives a single 20 A compressor relay for larger condensing units, CC 522 pairs a 20 A compressor relay with a 5 A alarm relay, and CC 525 pairs the 20 A compressor with a buzzer. CC 552 is the dual-compressor model — two 10 A relays sequenced lead/lag. Related variants CC 521 (heater/defrost relay), CC 524 (compressor + fan + defrost with two NTC sensors) and CC 548 (door-switch input) extend the range for evaporator and door control.
How does a CC controller protect the compressor?
CC controllers protect the compressor mainly through an adjustable anti-short-cycle delay that stops the relay re-energising too soon after it drops out. Every CC model carries a relay delay timer settable from 0 to 999 minutes, so a compressor that stops on a satisfied set-point or brief power dip must wait out the delay before restarting — preventing liquid slugging and motor-winding stress from rapid cycling. The adjustable hysteresis (0.1 to 20°C differential) further limits cycling by holding a temperature band around the set-point rather than switching on every fractional change. On alarm models (CC 512, CC 522) the auxiliary relay flags a high-temperature excursion, and on CC 515/CC 525 an on-board 12 V DC buzzer alerts staff. Offset adjustment (−9 to +9°C) trims probe reading to true product temperature.
How does defrost work on Multispan CC controllers?
Defrost on the CC series is time-initiated and time-terminated: you set a defrost frequency (how often, 1 to 999 hours) and a defrost time (how long, 1 to 999 minutes), and the controller pauses cooling to let the evaporator clear ice. On base models such as CC 510, defrost is off-cycle — the compressor simply stops for the defrost period so ambient or fan heat melts frost. CC 521 adds a dedicated 10 A heater relay for electric defrost, and CC 524 provides separate compressor, fan and defrost relays with two NTC sensors, so evaporator temperature can terminate defrost and manage fan delay. Correct defrost settings matter in humid UAE conditions, where cold-room evaporators ice quickly and blocked coils raise energy use and pull-down time.
What do the alarm, buzzer and door inputs do (CC 512 / 515 / 522 / 525)?
The alarm relay, buzzer and door inputs turn a basic thermostat into a monitored refrigeration controller. CC 512 and CC 522 provide a separate alarm relay (10 A and 5 A respectively) that changes state on a high- or low-temperature condition — wire it to a beacon, auto-dialler or BMS input to warn that a cold room is losing temperature. CC 515 and CC 525 instead carry an integral 12 V DC buzzer for local audible warning, useful on display cabinets and bottle coolers where staff are nearby. The related CC 548 adds a digital door-switch input so opening a cold-room door can pause the compressor or fan and start a door-open alarm. These signalling features help UAE operators meet food-safety cold-chain expectations across supermarkets, central kitchens and pharmacies.
Which CC model should I choose for a cold room, chiller or display cabinet?
Match the model to load and signalling need. For a small display chiller, bottle cooler or under-counter freezer with a compressor under roughly 10 A, CC 510 (plain) or CC 515 (with buzzer) is sufficient. For a walk-in cold room or larger condensing unit drawing up to 20 A, choose CC 520, or CC 522 to add a high-temperature alarm relay for the cold-chain log. Supermarket and pharmacy cold rooms needing both audible and relay alerting suit CC 512 (10 A) or CC 522 (20 A). Multi-compressor cold rooms and refrigeration racks use CC 552 to sequence two compressors lead/lag. Where electric defrost or fan control is required — blast freezers and low-temperature evaporators common in Dubai and Sharjah food factories — step up to CC 521 or CC 524.
What sensor, supply voltage and wiring do CC controllers use?
CC controllers sense temperature with a 10 kΩ NTC thermistor probe reading −50 to 99.9°C at 0.1°C resolution and ±1% FSD accuracy — the probe family is common across the range, so spares are interchangeable. The controller mounts in a standard panel cutout (about 30 × 71 mm for the CC 510 case, 37 × 78 × 70 mm overall) and accepts a wide auxiliary supply of 230 V AC 50/60 Hz, 24 V DC or 12 V DC, drawing about 3 VA. Compressor and auxiliary loads connect through the on-board changeover (NO-C-NC) relay contacts. Because the relay directly switches compressor current, size the model to running and locked-rotor current, or drive a contactor for motors above the 10 A / 20 A contact rating — standard practice in DEWA-compliant refrigeration and MCC panels.
Why does the CC series suit UAE refrigeration conditions?
The CC series suits UAE refrigeration because it tolerates high ambient heat, wide supply variation and humid, ice-prone conditions. Dubai and Abu Dhabi summer ambients push condensing units hard, so the adjustable hysteresis and 0–999 minute compressor delay reduce short-cycling and protect motors during voltage dips on the local network. The 12 V DC, 24 V DC and 230 V AC supply options let the same controller drop into battery-backed or transformer-fed panels. NTC sensing to −50°C covers blast freezers and low-temperature cold stores used across food-processing zones in Dubai Industrial City, Sharjah and Al Quoz. Genuine, CE-certified units are stocked locally by Al Misbah Al Sehri, the authorized Multispan distributor, with fast delivery to all seven emirates and the wider GCC — avoiding the lead time and counterfeit risk of overseas sourcing.
