Note: The P24A packaged ammonia machine was introduced in 1971. The first models were built
with York compressors with direct drive motors. Mycom compressors were used as well as Vilter
compressors over the years. The original control panel utilized Allen-Bradley NEMA components,
and in mid-1993 changed to include Cutler-Hammer components. The control panel was changed to
Allen Bradley I.E.C components in mid-1999
Control Panel Components (Allen-Bradley prior to 1993)
Part NumberReq'dDescription
12A2117C031FREEZER PRESSURE SWITCH, ASCO PG16A
Replaces Mercoid Control #DA/524/2
12A2117T031TRANSDUCER, ASCO RANGE 6-60 PSI
Use with Asco Freezer Pressure Switch #12A2117C03
12A2117F071CONDENSER FAN CONTROL SWITCH
Replaces Mercoid Control #DA/24/3B or Asco 12A2117E02
Replaces all other timers (base needed for replacement)
12A7503E22011TIMER BASE #0T08-PC, EIGHT PIN PLUG-IN
12B7503E181ELAPSED TIME INDICATOR, 230V, 60HZ PANEL MOUNT
12B7503E171ELAPSED TIME INDICATOR, 220V, 50HZ PANEL MOUNT
12A7517E023RELAY 700N200A2 240-60/220-50
"CR" Relay
12A7518E01CONTACT CARTRIDGE 700-C1 FOR A/B N-TYPE RELAYS
12A7503E07TIMER 700-NT PNEUMATIC FOR N TYPE RELAY
12A7520E021PILOT LIGHT LENS "RED" DIALCO (9/16" MOUNT LIGHT)
12A7520E031PILOT LIGHT LENS "AMBER" DIALCO (9/16" MOUNT LIGHT)
12A7520E071PILOT LIGHT LENS "WHITE" DIALCO (9/16" MOUNT LIGHT)
12A7520E063PILOT LIGHT RECEPTACLE DIALCO (9/16" MOUNTING HOLE)
Front Mounted Receptacle
12A7520E083LAMP,NEON, DIALCO #B2A, 115V/6
(Also used in the rear mounted receptacles)
12A7520E091PILOT LIGHT,RED,250V OSLO (SQ w/RECT. MOUNT HOLE)
12A7520E11PILOT LIGHT,AMBER,250V OSLO (SQ w/RECT. MOUNT HOLE)
12A7520E111PILOT LIGHT ,CLEAR ,250V OSLO (SQ w/RECT. MOUNT HOLE)
Note: Square Lights with rectangular hole used 1989-93
Control Panel Components (Allen-Bradley since 1999) (Con'd)
Part NumberReq'dDescription
12A7503E22012TIMER BASE #0T08-PC, EIGHT PIN PLUG-IN
12B7503E211ELAPSED TIME INDICATOR, 220V, 60HZ, DIN RAIL MOUNT
12B7503E201ELAPSED TIME INDICATOR, 220V, 50HZ, DIN RAIL MOUNT
12A7500E621A/B PILOT LIGHT OPERATOR, BLUE (7/8" NOTCHED HOLE)
"1LT" Freezing
12A7500E631A/B PILOT LIGHT OPERATOR, CLEAR (7/8" NOTCHED HOLE)
"2LT" Liquid Feed
12A7500E641A/B PILOT LIGHT OPERATOR, RED (7/8" NOTCHED HOLE)
"3LT" Thawing
12A7500E783INCANDESCENT LIGHT MODULE FOR PILOT LIGHT
12A7520E353BULB #755, A/B 2TL5/2TL7 PILOT LIGHT, 6.3V
12A7517E282A/B RELAY, 10A, 3-NO/1-NC, 208/240
"CR" Relay
12A7503E381A/B TIMER, PNEUMATIC, ON-DELAY
Time Delay for Cutter Motor on "1CR" Relay
12A7516E231A/B CONTACTOR, 9-AMP, 3-POLE, 208/240V W/1-NO AUX
"2M" Water Pump or "3M" Cutter Motor (9-amp Max)
12A7516E241A/B CONTACTOR, 12-AMP, 3 POLE, 208/240V W/1-NO AUX
"2M" Water Pump or "3M" Cutter Motor (12-amp Max)
12A7516E251A/B CONTACTOR, 16-AMP, 3-POLE, 208/240V W/1-NO AUX
"2M" Water Pump or "3M" Cutter Motor (16-amp Max)
12A7530E541MANUAL MOTOR STARTER, 1.6-2.5 AMP OVERLOAD
12A7530E551MANUAL MOTOR STARTER, 2.5-4.0 AMP OVERLOAD
12A7530E561MANUAL MOTOR STARTER, 4.0-6.3 AMP OVERLOAD
12A7530E571MANUAL MOTOR STARTER, 6.3-10.0 AMP OVERLOAD
12A7530E581MANUAL MOTOR STARTER, 10.0-16.0 AMP OVERLOAD
12A7518E332A/B AUX. CONTACT, 6A, 1 NO, SIDE MOUNT