Installing a pharmacy or lab refrigerator: placement, power and monitoring

Use equipment suited to the job

Household refrigerators and beverage coolers are not designed to hold a tight temperature band evenly, and their temperature can swing with door openings and defrost cycles. Purpose-built pharmacy and lab refrigerators typically use fan-assisted cooling for even temperature, accurate controllers, alarms and lockable doors. Check what your programme or regulator expects before buying.

Placement

• In a room with a reasonably stable temperature, away from windows, direct sun, heaters and AC vents blowing directly on it.
• With the manufacturer's clearances at the back, sides and top.
• On a level, firm floor so the door closes and seals by itself.
• Where staff can see the display and hear alarms, but not in a busy corridor where doors are knocked open.
• In a secure area, with the lock used where required.

Dedicated, protected power

Connect the refrigerator to its own earthed socket, installed by a licensed electrician, with nothing else plugged into it. A switched socket that can be turned off accidentally is a common cause of loss; label it clearly or use a socket cover. Ask whether a stabiliser or voltage protection device is advisable for your supply.

Plan for power cuts. If outages are common, discuss backup through an inverter or generator sized for the compressor's starting current, with staggered restart if several units share it.

Independent temperature monitoring

Do not rely only on the controller display. An independent, calibrated thermometer or data logger, with its probe placed where the product sits, confirms the actual storage temperature and records what happened overnight or during an outage. Many logging devices simulate product temperature using a probe in a buffer such as glycol, which reacts more like stored product than air does.

Set high and low alarms, and test them at commissioning. Decide who responds to an alarm out of hours and how they will be told.

Check temperature distribution

Temperatures differ inside a cabinet: near the evaporator, by the door and at the top and bottom. Before loading, run the unit empty and then loaded, and check readings at several positions over at least a day. Identify any zones that run too cold or warm and keep product out of them. Larger facilities may follow formal temperature mapping procedures; your quality system or programme guidance will specify what is required.

Loading for even temperature

• Do not load until the unit has run stably at the set temperature.
• Leave space between products and the walls, the back and the evaporator outlet.
• Do not store items in the door shelves if your guidance advises against it; doors warm fastest.
• Keep food and drink out of medicine and sample refrigerators.
• Do not overfill; restricted airflow creates warm and cold pockets.

Records and handover

Keep the installation record together: electrical tests, commissioning readings, alarm settings, the calibration certificate for the monitoring device and the maintenance schedule. Record temperatures as your programme requires, and record any excursions and the action taken.

Plan the alarm response before you need it

An alarm is only useful if someone acts on it. Before the refrigerator goes into use, write down who is called, at what temperature, and what they should do: check the door and power, move stock to a backup unit if needed, and record the event. If the pharmacy or lab is closed at night, a local buzzer alone may go unheard; consider a monitoring device that sends an alert by SMS or app.

Identify a backup refrigerator or arrangement in advance, kept at the right temperature, so product can be moved quickly during a breakdown or a long outage.

• Named first and second contacts for alarms, with phone numbers by the unit.
• A short written procedure kept next to the refrigerator.
• Contact details for the service provider and the expected response time.