HQC45

Overview

The Hobart HQC45 Quick Chill is a commercial quick-chill refrigerator produced by Hobart Corporation, 701 S. Ridge Avenue, Troy, Ohio 45374-0001, under model number ML-124059. Hobart's replacement-parts catalog for the unit, Form 34424 Rev. A (October 2001), breaks the machine into illustrated assemblies: the main cabinet, the door, the hot gas evaporating pan, the evaporator section, the electrical section, the condensing unit (front and rear views), and the electrical unit. The same catalog also documents the HQCF45 Quick Chill Freezer (ML-124060), so the components listed here apply across both models.

Documentation for the HQC45 includes a 12-page user's manual listed in Hobart's manual libraries, plus the wiring diagram (part 00-889075) that is itself a listed part in the electrical section. Hobart's manual index also lists the larger HQC90, a related model in the same Quick Chill line.

Real-world deployments show the machine at work in institutional settings: a February 10, 2003 listing in the Lawrence Journal World offers a "Hobart Quick chiller hqc45 refrigerator used for training" alongside a hot food pass-through cabinet — a typical pairing where food moves from hot holding into rapid chilling.

Key Features

• Mobile or fixed footing: the cabinet sits on four casters — two without brakes (01-030254) and two with brakes (01-030255) — and the catalog also lists a pair of 6-inch stainless steel legs (00-630153-00079).
• Stainless detail work: stainless steel (SST) appears throughout the hardware schedule, from the 6-inch legs and 3/16-inch pop rivets to the 8-32 x 1/2-inch Phillips round-head cap screws used on the door and the hot gas evaporating pan.
• Hot-gas defrost circuit: a dedicated Hot Gas Evaporating Pan Assembly (00-889087-00001) with tin-coated copper tube, tube holders, and foam tape works alongside a dedicated defrost contactor (01-010500) in the electrical section.
• Evaporator airflow: an evaporator fans rack assembly (00-889088) and an evaporator protector assembly (00-889086) mount in the door section of the cabinet.
• Probe-driven control: two coil and air probes (00-630182-00099) with a short probe cable (01-010411) feed the electronic board, backed by a safety control (01-014622) and an OMRON #MK2P-SAC-24-0 hi-limit relay.
• Serviceable condensing unit: the front and rear views list a suction accumulator (RR-3738), filter drier (UK-083), OPR valve, pressure switch, vibration absorber (3434FX), fan blades, and compressor run and start capacitors.
• Condensate handling: a 115 V condensate pan with a 3-foot cord (01-030366) and a dedicated support (00-889025-00001) mount in the main cabinet.
• Documented wiring: the wiring diagram (00-889075) is a listed part, so the control layout is traceable for service.

Specifications

Every figure below comes from Hobart parts catalog Form 34424 Rev. A (October 2001) or the listed documentation for the HQC45.

• Model: HQC45 Quick Chill, ML-124059
• Manufacturer: Hobart Corporation, 701 S. Ridge Avenue, Troy, Ohio 45374-0001
• Parts catalog: Form 34424 Rev. A (October 2001)
• User documentation: 12-page user's manual; wiring diagram, part 00-889075
• Cabinet: metal base assembly (00-889056); cabinet liner assembly (00-889053); front grille (00-889071-00001); right and left lower hinge brackets (00-630180-00066 / 00-630180-00067); four angle brackets (00-889062-00003)
• Mobility: two casters without brakes (01-030254); two casters with brakes (01-030255); two 6-inch stainless steel legs (00-630153-00079)
• Condensate pan: 115 V, with 3-foot cord (01-030366); condensate support (00-889025-00001)
• Hot gas evaporating pan: pan (00-889087-00001); two tube holders (00-889087-00002); tin-coated copper tube (01-032455); four foam tape strips (01-033629); two each hook and eye Velcro strips, 5/8 x 2 (01-033626 / 01-033627); two 8-32 trick nuts (01-008043)
• Evaporator: fans rack assembly (00-889088); protector assembly (00-889086); wire holder (00-889079-00008)
• Condensing unit: run capacitor 40 MFD, 440 V (00-630184-00013); compressor start capacitor, 440 V (00-630184-00014); compressor relay (00-630184-00012); suction accumulator RR-3738 (00-630182-00095); pressure switch (00-630184-00008); OPR valve (01-011304); vibration absorber 3434FX (00-630182-00028); fan blades (00-630184-00009); filter drier UK-083 (00-630181-00063)
• Contactors: 9 A (00-630141-00013); 12 A (00-630141-00012); defrost contactor (01-010500); 3-pole 25 A (01-010500)
• Breakers: main, 2-pole, 15 A (01-010431); transformer breaker (01-010461); secondary breaker (00-630183-00008); two secondary breakers for the electronic board (01-010436)
• Relays: hi-limit relay, OMRON #MK2P-SAC-24-0 (00-630142-00012); compressor relay (00-630184-00012)
• Transformer: pilot control, 150 VA (00-294500-046-1)
• Power supplies: PD-25-7.5 (00-434359-00002); PD-25 Amp (00-434359-00001)
• Capacitor (electrical unit): run, 2 UF (00-811201)
• Probes: two coil and air probes (00-630182-00099); short probe cable (01-010411)
• Electrical hardware: terminal block #M6/8P (00-630142-00001); electric connector M4/6 (00-630141-00069); wiring duct, 1 1/2 x 3 (00-630142-00040); plastic track and cover (00-630142-00040); mounting rail (01-010250); end stop (00-630141-00072); two end sections (00-630141-00070); nine 10-pole jumper bars (00-630141-00076); electric section mounting plate (00-889028-00003)
• Fasteners: 8-32 x 1/2 in. Phillips round-head cap screws, SST (01-012525); twelve 4 mm x 8 mm screws (01-012636); four washers (01-012620); 3/16 in. stainless pop rivets (00-630161-00041)

Operation

The parts catalog shows how the HQC45's control side is organized. Mains-side protection starts at the main breaker (2-pole, 15 A), with a separate transformer breaker and a secondary breaker, while two secondary breakers protect the electronic board. Switching duties fall to a 9 A contactor, a 12 A contactor, a 3-pole 25 A contactor, and the defrost contactor. Control power comes from a 150 VA pilot-control transformer and two power supplies (PD-25-7.5 and PD-25 Amp), with a 2 UF run capacitor in the electrical unit.

Temperature sensing relies on two coil and air probes connected through a short probe cable; a safety control and an OMRON #MK2P-SAC-24-0 hi-limit relay provide the protective layer. On the refrigeration side, the evaporator fans ride on a rack assembly behind a protector assembly, the hot gas evaporating pan with its tin-coated copper tube and dedicated defrost contactor points to a hot-gas defrost arrangement, and condensate collects in the 115 V pan with its 3-foot cord.

Applications

Quick chill refrigerators like the HQC45 sit on the cold side of a cook-chill workflow: food comes out of cooking or hot holding and moves into the chiller. The February 10, 2003 Lawrence Journal World listing captures one such setup — an HQC45 "used for training" next to a hot food pass-through cabinet, the kind of hot-and-cold pairing found in school and institutional training kitchens. With casters under the metal base, the unit can be repositioned as service needs change, while the listed 6-inch stainless steel legs cover installations that stay put.