Condenser Fan Control - Daikin MicroTech III Operation Manuals

Condenser Fan Control

RPS Units
There are up to four condenser fans per circuit. The first fan on
each circuit is always turned on when any compressor on the
circuit is turned on through auxiliary switches on the compressor
contactors . The second two fans on each circuit (if applicable)
are controlled by outputs from the Main Controller . These are
controlled via Condenser Fan Output 1 and Condenser Fan
Output 2 . The last fan on each circuit (if applicable) is controlled
by an external refrigerant pressure switch .
Condenser Fan Output 1 is turned ON when any
compressor on is on and the OAT rises above the
Condenser Fan A Set Point . Condenser Fan Output 1 is
turned OFF when all compressors are OFF or the OAT drops
below the Condenser Fan 1 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 .
The Condenser Fan default setpoints vary by unit size according to the following tables:
Table 55: 410A Condenser Fan Setpoints
CondFanOutput1
Unit
(MCB-DO7)
Size
Setpoint Differential Setpoint Differential Setpoint Differential
015 70 5
016 75 5
020 70 5
021 75 5
025 60 5
026 70 5
030 75 5
031 75 5
035 70 5
040 65 5
042 70 5
045 65 5
050 65 5
051 70 5
060 60 5
062 70 5
063 70 5
068 70 5
070 75 5
071 75 5
075 65 5
079 65 5
080 75 5
081 75 5
085 70 5
090 60 5
091 60 5
100 60 5
101 60 5
105 50 5
110 65 5
120 65 5
125 65 5
130 60 5
140 55 5
OM 920-6 • MICROTECH UNIT CONTROLLER
CondFanOutput2
PC13/PC231
(MCB-DO8)
— — —
— — —
— — —
— — —
— — —
— — —
— — —
— — —
— — —
— — —
— — —
— — —
— — —
— — —
— — —
— — —
— — —
— — —
— — 90
— — 90
85 5 90
80 5 90
— — 90
— — 90
— — 90
85 5 90
85 5 90
85 5 90
85 5 90
80 5 90
90 5 90
85 5 90
85 5 90
85 5 90
80 5 90
Condenser Fan Output 2 is turned ON when any
compressor is ON and the OAT rises above the Condenser
Fan B Set Point . Condenser Fan Output 2 is turned OFF
when all compressors are OFF or the OAT drops below the
Condenser Fan 2 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 .
Condenser Fan Output 3 is turned ON when any
compressor is ON and the OAT rises above the Condenser
Fan 3 Set Point . Condenser Fan Output 3 is turned OFF
when all compressors are OFF or the OAT drops below the
Condenser Fan 3 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 .
Table 56: R22 Condenser Fan Setpoints
CondFanOutput1
Unit
(MCB-DO7)
Size
Setpoint Differential Setpoint Differential Setpoint Differential
— 015 60
— 018 60
— 020 60
— 025 65
— 030 65
— 036 70
— 040 65
— 045 65
— 050 60
— 060 25
— 070 40
— 075 65
— 080 65
— 090 65
— 105 0
—
Table 57: R407C Condenser Fan Setpoints
—
—
CondFanOutput1
35
Unit
(MCB-DO7)
Size
35
Setpoint Differential Setpoint Differential Setpoint Differential
35
015 60
35
018 0
35
020 0
35
025 65
35
030 65
35
036 65
35
040 60
35
045 55
35
050 50
35
060 15
35
070 30
35
075 65
35
080 65
35
090 50
35
105 0
126
o
peraTor
CondFanOutput2 CondFanOutput3
(MCB-DO8)
5 — —
5 — —
5 — —
5 — —
5 — —
5 — —
5 — —
5 — —
5 — —
5 — —
5 — —
5 0 5
5 0 5
5 0 5
5 70 5
CondFanOutput2 CondFanOutput3
(MCB-DO8)
5 — —
5 — —
5 — —
5 — —
5 — —
5 — —
5 — —
5 — —
5 — —
5 — —
5 — —
5 0 5
5 0 5
5 0 5
5 70 5
www .DaikinApplied .com
' g
s uIde
(MCB-DO6)
— —
— —
— —
— —
— —
— —
— —
— —
— —
70 5
70 5
75 5
75 5
75 5
45 5
(MCB-DO6)
— —
— —
— —
— —
— —
— —
— —
— —
— —
70 5
70 5
75 5
75 5
75 5
35 5