McQuay MicroTech III RAH - Page 107

McQuay OM 920-1 107
Operator’s Guide
Cond Fan Output C is turned on when any compressor on is on and the OAT rises above the
Condenser Fan C Set Point. Cond Fan Output C is turned off when all compressors are off or
the OAT drops below the Condenser Fan C Set Point by more than the Condenser Fan
Differential (Default = 5°F). External relays allow operation of condenser fans associated with
a specific circuit only when a compressor on that circuit is on.
Note:
1
PC13/PC23: Cut in= 450 PSIG (125F sat.). Cut out= 275 PSIG (90F sat.).
Table 71: R-410A Condenser Fan Setpoints
Unit Size
CondFanOutputA
(MCB-D07)
CondFanOutputB
(MCB-D08)
PC13/PC23
1
Setpoint Differntial Setpoint Differential Setpoint Differential
050 65 5 - - - -
060 60 5 - - - -
062 70 5 - - - -
068 70 5 - - - -
070 75 5 - - 90 35
075 65 5 85 5 90 35
080 75 5 - - 90 35
085 70 5 - - 90 35
090 60 5 85 5 90 35
100 60 5 85 5 90 35
105 50 5 80 5 90 35
110 65 5 90 5 90 35
120 65 5 90 5 90 35
125 65 5 85 5 90 35
130 60 5 85 5 90 35
140 55 5 80 5 90 35
Table 72: R-22 Condenser Fan Setpoints
Unit Size
CondFanOutputA
(MCB-D07)
CondFanOutputB
(MCB-D08)
CondFanOutputC
(MCB-D06)
Setpoint Differntial Setpoint Differential Setpoint Differential
015 60 5 - - - -
018 60 5 - - - -
020 60 5 - - - -
025 65 5 - - - -
030 65 5 - - - -
036 70 5 - - - -
040 65 5 - - - -
045 65 5 - - - -
050 60 5 - - - -
060 25 5 - - 70 5
070 40 5 - - 70 5
075 65 5 0 5 75 5
080 65 5 0 5 75 5
090 65 5 0 5 75 5
105 0 5 70 5 45 5