York YCAS0098EB, Installation Operation & Maintenance, Page: 168 / 184

168
JOHNSON CONTROLS
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 seconds:
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 pressure to
an acceptable range.
TABLE 3 – 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 >250 PSIG <180 PSIG & <70°F 11M 132 10
S
4 1, 5 >265 PSIG <195 PSIG & <75°F 9M, 11M 130, 132 10,15
5 3, 5 >280 PSIG <210 PSIG & <80°F 10M, 11M 131, 132 10, 14
1
6 1, 3, 5 >290 PSIG <220 PSIG & <85°F 9M, 10M, 11M 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 >250 PSIG <180 PSIG & <70°F 17M 232 10
S
4 2, 6 >265 PSIG <195 PSIG & <75°F 15M, 17M 230, 232 10, 15
5 4, 6 >280 PSIG <210 PSIG & <80°F 16M, 17M 231, 232 10, 14
2
6 2, 4, 6 >290 PSIG <220 PSIG & <85°F 15M, 16M, 17M 230, 231, 232 10, 14, 15
Table 5 provides a simplified operating graph of the fan
staging for this version.
Fan stages increment identical to the stages shown in
Table 3.
TABLE 4 – CONDENSER FAN CONTROL AND FAN CONTACTOR DATA FOR DXST UNITS
WITH 5 FANS/SYSTEM (EPROM VERSION C.A17.09.02 (5320)
* 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 >205 PSIG <135 PSIG & <60°F 9M 130 15
S
2 3 >220 PSIG <150 PSIG & <65°F 10M 131 14
Y
3 5 >235 PSIG <165 PSIG & <70°F 11M 132 10
S
4 1, 5 >250 PSIG <180 PSIG & <75°F 9M, 11M 130, 132 10,15
5 3, 5 >265 PSIG <195 PSIG & <80°F 10M, 11M 131, 132 10, 14
1
6 1, 3, 5 >275 PSIG <205 PSIG & <85°F 9M, 10M, 11M 130, 131, 132 10, 14, 15
1 2 >205 PSIG <135 PSIG & <60°F 15M 230 15
S
2 4 >220 PSIG <150 PSIG & <65°F 16M 231 14
Y
3 6 >235 PSIG <165 PSIG & <70°F 17M 232 10
S
4 2, 6 >250 PSIG <180 PSIG & <75°F 15M, 17M 230, 232 10, 15
5 4, 6 >265 PSIG <190 PSIG & <80°F 16M, 17M 231, 232 10, 14
2
6 2, 4, 6 >275 PSIG <205 PSIG & <85°F 15M, 16M, 17M 230, 231, 232 10, 14, 15
Micro Panel Contents