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TABLE 6 – CONDENSER FAN CONTROL WITH 3
FANS PER SYSTEM (EPROM VERSIONS
C.A32.09.02 (0483), C.ACS.09.02 (D87E),
AND C.A06.09.03 (EIOC)
Turn on a Fan Stage
Every 5 sec
19.7 BARG
Turn on a Fan Stage
every 15 min
17.2 BARG
Discharge Pressure 17.2 BARG
10.3 BARG
Turn off Fan Stage
every 15 min.
8.3 BARG
Turn off a Fan Stage
every 5 sec.
0 BARG
Note: A low Oil - Suction differential Pressure less than 5.2 Bar.
will cause the micro to turn a fan stage Off every 5 sec. This
will override pressure control of the fans.
TABLE 7 – CONDENSER FAN CONTROL AND FAN CONTACTOR DATA FOR DXST UNITS
WITH 3 FANS/SYSTEM (EPROM VERSIONS C.A14.09.03 (A85F), OTHER .03 VERSIONS, AND HIGHER
Fan
Fans
Stage
1
1
SYS1
2
3
3
5
4
1, 5
SYS2
5
3, 5
6
1, 3, 5
* Sys 1 Outputs are on Relay Board #1
Sys 2 Outputs are on Relay Output Board #2
YORK INTERNATIONAL
ON *
OFF *
Conditions
Conditions
DP
DP & OAT
>14.1 BARG
<9.3 BARG & <15.6°F
>18.3 BARG
<9.3 BARG & <18.3°F
>19.7 BARG
<9.3 BARG & <21.1°F
>14.1 BARG
<9.3 BARG & <23.9°F
>18.3 BARG
<9.3 BARG & <26.7°F
>19.7 BARG
<9.3 BARG & <29.4°F
EPROM Version C.A14.09.03 (A85F),
other .03 versions and higher
Fan operation is outlined in Table 7. Condenser fan ON
conditions are governed solely by the Discharge Pres-
sure (DP). When the DP rises above 14.1 BARG, fan
stage 1 is activated. From there, subsequent fan stages
are activated as the discharge pressure rises. The sys-
tem will remain at the highest fan stage reached unless
the OFF conditions outlined in the next paragraph are
satisfied.
Condenser fan OFF conditions are governed by both the
DP and OAT. Fan staging will be decreased from the highest
fan stage reached if both the DP and OAT requirements are
met. For example, if a system is at fan stage 3, and the DP
falls below 13.4 BARG and the OAT drops below 23.9° C,
the fan stage will be reduced to stage 3.
Fan
Contactor
9M
10M
11M
9M, 11M
10M, 11M
9M, 10M, 11M
FORM 201.18-NM6
Relay
Wire
Board
Number
Output*
130
15
131
14
132
10
130, 132
10,15
131, 132
10, 14
130, 131, 132
10, 14, 15
145
8
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