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Care-facility kitchen: a freezer creeping up, two failed defrost timers, both boxes back overnight

Client: Kitchen serving a nursing home
Collage of four photos from the care-facility kitchen job: the old mechanical defrost timer, the new electronic timer, the cleaned condenser coil, the thermometer reading 37.2 F
Scope
Reach-in freezer and refrigerator: defrost timer failure diagnosed and both timers replaced, coils thawed and cleaned, temperatures verified
Timeline
Two visits, two days apart
Location
New York City
Year completed
2026
What was delivered
  • Intermatic electronic defrost timer fitted to the Continental 2F reach-in freezer, four defrosts a day
  • Freezer coil thawed; box back to temperature overnight
  • Same-age mechanical timer on the Hoshizaki RH2-SSB refrigerator beside it replaced before it failed
  • Condenser coil cleaned with the grille off
  • Product zone verified at 37.2°F, 40% RH with our own thermo-hygrometer

The call

A kitchen that feeds a nursing home cannot lose a freezer. The call was a two-door reach-in freezer creeping up in temperature, day after day, with nothing obviously wrong from the outside.

What we found

The box is a Continental Refrigerator model 2F, a commercial reach-in freezer on 115 volts, single phase, R-404A with a 15-ounce charge. The plate rates the condensing unit at 7.9 amps running, 51 amps locked rotor, and the electric defrost circuit at 9.6 amps.

The Continental 2F data plate: 115 V single phase, R-404A, 15 oz charge, condensing unit 7.9 A, defrost circuit 9.6 A.
The Continental 2F data plate: 115 V single phase, R-404A, 15 oz charge, condensing unit 7.9 A, defrost circuit 9.6 A.

Behind the grille sits the defrost timer, and this one was the mechanical kind: a small clock motor turning a dial with trip pins, the design that has been in reach-ins for fifty years. The clock motor had stopped, which left the timer sitting in the run position. No defrost, ever. The coil iced a little more each day until the fans were pushing air through a snowbank and the box could no longer hold.

The original mechanical defrost timer, a clock-motor dial with trip pins, in the compressor compartment. The motor had stopped, so the dial never reached a defrost.
The original mechanical defrost timer, a clock-motor dial with trip pins, in the compressor compartment. The motor had stopped, so the dial never reached a defrost.

The work, in order

  1. Mechanical timer removed and replaced with an Intermatic electronic defrost timer, solid-state switching with a 24-hour dial that can still be read on site.
  2. Timer set to four defrosts a day.
  3. Coil thawed. The freezer was back to temperature overnight.
  4. Two days later, back in the same kitchen for the reach-in refrigerator next to it, a Hoshizaki RH2-SSB. Same check, same age of timer: replaced before it could fail on its own schedule.
  5. Condenser coil on that box cleaned while the grille was off.
  6. Product zone measured with our own thermo-hygrometer rather than the dial on the door.
The new Intermatic electronic defrost timer: two relays, an eight-terminal block and a 24-hour dial, with no clock motor to wear out.
The new Intermatic electronic defrost timer: two relays, an eight-terminal block and a 24-hour dial, with no clock motor to wear out.
Second box, second visit: the new electronic timer in its grey enclosure mounted beside the old mechanical timer on the Hoshizaki reach-in.
Second box, second visit: the new electronic timer in its grey enclosure mounted beside the old mechanical timer on the Hoshizaki reach-in.

Verified before leaving

The refrigerator’s condenser coil after cleaning. A coil this clear is a compressor that gets to rest.
The refrigerator’s condenser coil after cleaning. A coil this clear is a compressor that gets to rest.
Product zone on our own thermo-hygrometer: 37.2°F and 40% relative humidity, measured inside the box rather than read off the door.
Product zone on our own thermo-hygrometer: 37.2°F and 40% relative humidity, measured inside the box rather than read off the door.

Equipment and parts

FreezerContinental Refrigerator model 2F two-door reach-in, 115 V 60 Hz single phase, R-404A 15 oz, condensing unit 7.9 A RLA / 51 A LRA, defrost circuit 9.6 A, design pressures 174 / 492 psi
RefrigeratorHoshizaki RH2-SSB two-door reach-in
TimersTwo Intermatic electronic defrost timers, replacing mechanical clock-motor timers of the same age
Defrost scheduleFour defrosts a day on the freezer
ReadingsProduct zone 37.2°F, 40% RH

What this means if you manage the building

A defrost timer is a cheap part with an expensive failure, and it fails silently: the box just gets warmer. In a kitchen where the boxes were all bought together, when one timer goes the rest are close behind, so the second visit was planned rather than waited for. For a facility that cannot lose a freezer, that is the whole point: same-age components get done together, on the kitchen’s schedule, not the equipment’s.

From the job log: Same kitchen, two boxes, two dead timers (scheduled for 5 Nov 2026, link follows).

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