Reznor MAPS - A,B,C Users Manual - Manual (Page 11)

Form O-MAPSIII&IV Cabinets A/B/C, P/N 257004R8, Page 11
3.6 Compressor
Operation,
Maintenance,
and
Replacement
Compressor Staging
(Cooling) - applies to
all MAPS ® III Models
Each MAPS ® III system leaves the factory with the compressor staging sequence
shown here for that Model and Size. The compressor will start based upon a call for
cooling to maintain the discharge air temperature setpoint. There is a minimum 240
second ON and OFF time for each stage (not compressor).
Compressor B
Compressor C
Compressor A
Compressor
Dh (Reheat)
FIGURE 4 - Identification of
Compressors by Circuit and
Staging for MAPS ® III Models
Compressor
Cabinet
Size
Cooling
Size
(RCB)
Cooling/
Reheat Size
(RDB)
Cooling Staging by Compressor
Circuit
1st 2nd 3rd 4th 5th
A 060 084 B A A+B -- --
A or B
078 102 B A A+B -- --
090 114 B A A+B -- --
118 142 B A A+B -- --
136 162 B A A+B -- --
B
160 184 B A A+B A+B+C --
186
210 A B A+C A+B A+B+C
222 A B A+C A+B A+B+C
200
224 A B A+B B+C A+B+C
236 A B A+B B+C A+B+C
C
190
248 A B A+B -- --
262 A B A+B -- --
216
272 B B+C A+B+C -- --
288 B B+C A+B+C -- --
298
354 B A+B B+C A+B+C --
370 B A+B B+C A+B+C --
410
468 B A+B A+B+C -- --
482 B A+B A+B+C -- --
NOTE: Staging listed by cooling only Models RCB/RDB also
applies to Models RDCB /RDDB with gas heat and Models RECB/
REDB with electric heat.
WARNINGS
For your safety, wear eye protection, gloves, and protective
clothing when handling refrigerant and oil and when brazing.
Have a fire extinguisher nearby. See Hazard Levels, page 3.
DANGER
The refrigeration circuits are high pressure systems.
Hazards exist that could result in personal injury or death. It
is therefore required that the removal and installation of this
scroll compressor be performed by a technician qualified in
R-410A refrigerant. See Hazard Levels, page 3.
DANGER
Never use oxygen to pressurize a refrigeration system. Oxygen
can explode on contact with oil and could result in personal injury
or death. When using high pressure gas such as nitrogen for
this purpose, ALWAYS USE A PRESSURE REGULATOR that can
control the pressure down to 1 or 2 psig. Failure to use a regulator
will result in extremely high pressure which could exceed the
burst pressure of the compressor or other system components
and result in personal injury or death. See Hazard Levels, page 3.