Foster BC 21, Service Manual

2

The controller will determine the temperature to be maintained during the hold phase based on the chilling cycle that has 
been completed. If a soft or hard chill has taken place the controller will maintain an air temperature of 2°c. 
The hold mode is principally intended as a temporary storage facility offering the operator flexibility until the product can 
be unloaded into a longer term storage units at the correct storage temperature. On occasion this hold period may 
become extended to operate overnight or to provide emergency refrigeration backup. In such instances defrosting would 
automatically occur as necessary. 

Model Details. 

The RBC 20-60 is capable of blast chilling 60kg of product from +70°c to +3°c in 90 minutes with entry temperature up to 
90°c 
The cabinet is compatible with the Rational 20 rack GN 1/1 201 trolley. 
Refrigerant used is R404A. 
The RBC20-60 has two separate refrigeration systems comprising, two condensing units, a twin circuit condenser and a 
twin circuit evaporator. (See pages 20 and 21 for assembly details and page 22 for schematic dual circuit refrigeration 
layout). 
The RBC20-60R has the same refrigeration systems but the condensing units are remotely sited. 
Refrigerant control is by expansion valve to control the correct amount of refrigerant required to meet the demand of the 
evaporator. (See page 21 for assembly detail). 
The parameter ‘Capacity Enable’ is set to ‘ON’ to allow for both condensing units to be running during the chill cycle 
therefore maximising the heat extraction from the product. During the ‘HOLD’ mode with the ‘Capacity Enable’ set to ‘ON’ 
one compressor will control the temperature throughout unless the temperature exceeds the capacity control limit.   
A 1½” BSP drain outlet is fitted in to the base of the cabinet for connection to external drain. 
The cabinet is delivered with the legs secured to the base of the cabinet. 

Controller Technical Detail 

The FCC controller is a three-piece unit made up of the Front Display and Dial Shaft Encoder, Mother Board plus 
Evaporator, Food and Air temperature probes. The front display PCB and the CPU/ Switching PCB unit are 
interconnected by a ribbon cable. The membrane attached to the front provides an IP rating of IP54 providing a scratch 
free wipe clean finish. 
The control dial is the method by which the controller is accessed for all requirements. It has three planes of movement, 
clockwise, anticlockwise and inwards. 
The control dial allows the operator/ engineer to move forward and backwards through various menu selections shown on 
the display, and enter a desired programme. The control system will then respond appropriately either commencing the 
operating cycle or allowing further configuration. 

 
Part numbers 

Item Description 

Part 

Number 

Controller Mother Board 

00-555395 

Controller Shaft Encoder 

00-555396 

Controller LCD Display 

00-555394 

Air Probe P1 

NTC type. 2.5m 

00-555397 

Evaporator Probe P2 

NTC type. 2.5m 

00-555397 

Food Probe 

5M Length 

00-555663   

Compressor x 2 

TAJ4519ZH T 400/50 

00-555885 

Condenser Coil 

   BC6013/122 

01-257300-01 

Condenser Fan Assembly 

S4E300-BP26-30 

00-555886 

Sight Glass 

3/8" 

15483015 

Drier  

00-555388 

Solenoid Valve 

EVR6 0 

15451215 

Liquid Receiver 

00-555579 

LP Switch 

2.5 Bar   0.5 Bar Diff 

00-555387 

HP Switch 

28 Bar – 3 Bar Diff 

00-555386 

High Pressure Thermostat 

KP5 Auto Re-set  (set at  18 BAR with a 3 BAR diff.) 

15452109 

Evaporator Coil 

BC6013/121 

01-256400-01 

Expansion Valve 

Valve Body TES2-NL68Z34300/68 

15450386 

Orifice 

NO 02 68-2092/68-2072 

15451104 

Expansion Valve 

Solder Adaptor 68-2 

15450910 

Evaporator Fan Motor 

W4E420-CP02-66788-4-7320 

00-555375 

hinge Edgemount 

00-555880 

Door Gasket 

1406x546MM 

01-256387-01 

Door Switch 

Circular (Reed Type) 

00-555829 

Door Switch Magnet 

Circular  

00-555828 

Door Handle 

Edgemount Latch Kit 

00-555881