144
YORK INTERNATIONAL
8.4
CONDENSER FAN CONTROL
The chiller is equipped with 8 or 10 condenser fans,
with 4 or 5 fans per system as given below. Fan control
is via Outside Ambient Temperature (OAT) and Dis-
charge Pressure (DP). There are six stages of fan con-
trol utilizing 3 outputs per system. The fan stages will
work according to Table 2 or Table 3 depending on the
number of fans/system. There will be a minimum 5 sec-
ond delay between all fan stages.
Condenser fan ON conditions are governed solely by
the Discharge Pressure (DP). When the DP rises above
15.2 bar, Stage 1 is activated. From here, subsequent
fan stages are activated as the DP rises in increments of
1 bar, except stage 6, which is activated when the DP
rises over 20 bar. The system will remain at the highest
Fan
ON
OFF
Fan
Wire
Relay
Stage
Fans
Conditions
Conditions
Contactor
Number
Board
DP
DP & OAT
Output
1
1
>15.2 BAR
<10.3 BAR & <15.6°C
9M
130
15
S
2
3
>16.2 BAR
<11.4 BAR & <18.3°C
10M
131
14
Y
3
5, 7
>17.2 BAR
<12.4 BAR & <21.1°C
11M, 12M
132
10
S
4
1, 5, 7
>18.3 BAR
<13.4 BAR & <23.9°C
9M, 11M, 12M
130, 132
10,15
5
3, 5, 7
>19.3 BAR
<14.5 BAR & <26.7°C
10M, 11M, 12M
131, 132
10, 14
1
6
1, 3, 5, 7
>20.0 BAR
<15.2 BAR & <29.4°C
9M, 10M, 11M, 12M
130, 131, 132
10, 14, 15
1
2
>15.2 BAR
<10.3 BAR & <15.6°C
15M
230
15
S
2
4
>16.2 BAR
<11.4 BAR & <18.3°C
16M
231
14
Y
3
6, 8
>17.2 BAR
<12.4 BAR & <21.1°C
17M, 18M
232
10
S
4
2, 6, 8
>18.3 BAR
<13.4 BAR & <23.9°C
15M, 17M, 18M
230, 232
10,15
5
4, 6, 8
>19.3 BAR
<14.5 BAR & <26.7°C
16M, 17M, 18M
231, 232
10, 14
2
6
2, 4, 6, 8
>20.0 BAR
<15.2 BAR & <29.4°C
15M, 16M, 17M, 18M
230, 231, 232
10, 14, 15
TABLE 2 – CONDENSER FAN CONTROL & FAN CONTACTOR DATA FOR DXST UNITS WITH 4 FANS/SYSTEM
Fan
ON
OFF
Fan
Wire
Relay
Stage
Fans
Conditions
Conditions
Contactor
Number
Board
DP
DP & OAT
Output
1
1
>15.2 BAR
<10.3 BAR & <15.6°C
9M
130
15
S
2
3, 5
>16.2 BAR
<11.4 BAR & <18.3°C
10M, 11M
131
14
Y
3
7, 9
>17.2 BAR
<12.4 BAR & <21.1°C
12M, 13M
132
10
S
4
1, 7, 9
>18.3 BAR
<13.4 BAR & <23.9°C
9M, 12M, 13M
130, 132
10,15
5
3, 5, 7, 9
>19.3 BAR
<14.5 BAR & <26.7°C
10M, 11M, 12M, 13M
131, 132
10, 14
1
6
1, 3, 5, 7, 9
>20.0 BAR
<15.2 BAR & <29.4°C
9M, 10M, 11M, 12M, 13M
130, 131, 132
10, 14, 15
1
2
>15.2 BAR
<10.3 BAR & <15.6°C
15M
230
15
S
2
4, 6
>16.2 BAR
<11.4 BAR & <18.3°C
16M, 17M
231
14
Y
3
8, 10
>17.2 BAR
<12.4 BAR & <21.1°C
18M, 19M
232
10
S
4
2, 8, 10
>18.3 BAR
<13.4 BAR & <23.9°C
15M, 18M, 19M
230, 232
10,15
5
4, 6, 8, 10
>19.3 BAR
<14.5 BAR & <26.7°C
16M, 17M, 18M, 19M
231, 232
10, 14
2
6
2, 4, 6, 8, 10
>20.0 BAR
<15.2 BAR & <29.4ºC
15M, 16M, 17M, 18M, 19M
230, 231, 232
10, 14, 15
TABLE 3 – CONDENSER FAN CONTROL & FAN CONTACTOR DATA FOR DXST UNITS WITH 5 FANS/SYSTEM
FIG. 52 – CONDENSER FAN LAYOUT FOR DXST 2-COMPRESSOR UNITS
fan stage reached unless the OFF conditions given 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 stage reached if both the DP and OAT re-
quirements are met. For example, if a system is at a fan
stage of 4, and the DP falls under 13.4 bar and the OAT
drops below 23.9°C, the fan stage will be reduced to 3.
The OFF conditions are given in the next two tables.
The tables on the next page also present fan contactor
data for the fans involved in each fan stage. SYS 1 uses
relay board #1. SYS 2 uses relay board #2.
YCAS 0425, 0475, 0515, 0555, 0575 and 0605 models
have 4 condenser fans/system:
LD06969
Micro Panel Contents
Summary of Contents for eco2 YCAS0425EB
Page 26: ...26 YORK INTERNATIONAL This page intentionally left blank Product Description ...
Page 49: ...49 YORK INTERNATIONAL FORM 201 18 NM8 This page intentionally left blank 7 ...
Page 60: ...60 YORK INTERNATIONAL FIG 20 CONTINUED ELEMENTARY DIAGRAM Technical Data ...
Page 65: ...65 YORK INTERNATIONAL FORM 201 18 NM8 WIRING DIAGRAM WYE DELTA START LD03229 FIG 23 CONT D 7 ...
Page 66: ...66 YORK INTERNATIONAL FIG 23 CONTINUED ELEMENTARY DIAGRAM Technical Data ...
Page 68: ...68 YORK INTERNATIONAL FIG 24 POWER PANEL FRONT INSIDE VIEW WYE DELTA START Technical Data ...
Page 71: ...71 YORK INTERNATIONAL FORM 201 18 NM8 LD03282 LD03283 LD03284 FIG 27 DETAIL A 7 ...
Page 74: ...74 YORK INTERNATIONAL FIG 32 DETAIL B Technical Data LD03285 ...
Page 75: ...75 YORK INTERNATIONAL FORM 201 18 NM8 FIG 33 DETAIL C 7 3 4 5 6 7 8 5 6 3 4 7 8 9 10 LD06841 ...