149YORK INTERNATIONAL
FORM 201.18-NM1 (102)
If discharge pressure falls between 150 PSIG and 120
120 PSIG, a step of fan cycling will be dropped and the
micro will start a 15 minute timer. If the discharge pres-
sure remains in this range for 15 minutes, another step
of fan cycling will be dropped and the micro will restart
the 15 minute timer.
If discharge pressure rises above 285 PSIG, the micro
will add a step of fan cycling every 5 seconds, until the
discharge pressure drops below 285 PSIG in an effort
to quickly control the discharge pressure to an accept-
able range.
If discharge pressure drops below 120 PSIG or oil to
suction pressure differential falls below 75 PSID, the
micro will turn off a step of fan cycling every 5 sec-
onds; until the discharge pressure rises above 120 PSIG
and oil to suction pressure differential rises above 75
PSID in an effort to quickly control the discharge pres-
sure to an acceptable range.
Table 8 provides a simplified operating graph of the fan
staging for this version.
TABLE 5 –CONDENSER FAN CONTROL AND FAN CONTACTOR DATA FOR DXST UNITS
WITH 5 FANS/SYSTEM (EPROM VERSIONS C.ACS.09.01 (F350) AND C.AC.09.02 (3902))
* Sys 1 Outputs are on Relay Board #1
Sys 2 Outputs are on Relay Output Board #2
Fan
ON * OFF *
Fan Wire
Relay
Stage
Fans Conditions Conditions
Contactor Number
Board
DP DP & OAT
Output*
1 1 >220 PSIG <150 PSIG & <60°F 9M 130 15
S
2 3, 5 >235 PSIG <165 PSIG & <65°F 10M, 11M 131 14
Y
3 7, 9 >250 PSIG <180 PSIG & <70°F 12M, 13M 132 10
S
4 1, 7, 9 >265 PSIG <195 PSIG & <75°F 9M, 12M, 13M 130, 132 10, 15
5 3, 5, 7, 9 >280 PSIG <210 PSIG & <80°F 10M, 11M, 12M, 13M 131, 132 10, 14
1
6 1, 3, 5, 7, 9 >290 PSIG <220 PSIG & <85°F 9M, 10M, 11M, 12M, 13M 130, 131, 132 10, 14, 15
1 2 >220 PSIG <150 PSIG & <60°F 15M 230 15
S
2 4, 6 >235 PSIG <165 PSIG & <65°F 16M, 17M 231 14
Y
3 8, 10 >250 PSIG <180 PSIG & <70°F 18M, 19M 232 10
S
4 2, 8, 10 >265 PSIG <195 PSIG & <75°F 15M, 18M, 19M 230, 232 10, 15
5 4, 6, 8, 10 >280 PSIG <210 PSIG & <80°F 16M, 17M, 18M, 19M 231, 232 10, 14
2
6 2, 4, 6, 8, 10 >290 PSIG <220 PSIG & <85°F 15M, 16M, 17M, 18M, 19M 230, 231, 232 10, 14, 15
8
TABLE 4 –CONDENSER FAN CONTROL AND FAN CONTACTOR DATA FOR DXST UNITS
WITH 4 FANS/SYSTEM (EPROM VERSIONS C.ACS.09.01 (F350) AND C.ACS.09.02 (3902)
* Sys 1 Outputs are on Relay Output Board #1
Sys 2 Outputs are on Relay Output Board #2
Fan
ON * OFF *
Fan Wire
Relay
Stage
Fans Conditions Conditions
Contactor Number
Board
DP DP & OAT
Output*
1 1 >220 PSIG <150 PSIG & <60°F 9M 130 15
S
2 3 >235 PSIG <165 PSIG & <65°F 10M 131 14
Y
3 5, 7 >250 PSIG <180 PSIG & <70°F 11M ,12M 132 10
S
4 1, 5, 7 >265 PSIG <195 PSIG & <75°F 9M, 11M, 12M 130, 132 10, 15
5 3, 5, 7 >280 PSIG <210 PSIG & <80°F 10M, 11M, 12M 131, 132 10, 14
1
6 1, 3, 5, 7 >290 PSIG <220 PSIG & <85°F 9M, 10M, 11M, 12M 130, 131, 132 10, 14, 15
1 2 >220 PSIG <150 PSIG & <60°F 15M 230 15
S
2 4 >235 PSIG <165 PSIG & <65°F 16M 231 14
Y
3 6, 8 >250 PSIG <180 PSIG & <70°F 17M, 18M 232 10
S
4 2, 6, 8 >265 PSIG <195 PSIG & <75°F 15M, 17M, 18M 230, 232 10, 15
5 4, 6, 8 >280 PSIG <210 PSIG & <80°F 16M, 17M, 18M 231, 232 10, 14
2
6 2, 4, 6, 8 >290 PSIG <220 PSIG & <85°F 15M, 16M, 17M, 18M 230, 231, 232 10, 14, 15
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