YORK INTERNATIONAL
76
Before the lead system can be unloaded to its 3rd step
of capacity, the Slave Module must already by disabled
with a dry contact closure between terminal 13 & 16
as described in the preceeding paragraph.
With contacts on terminals 13 & 16 closed, the lead
system can be unloaded to its 3rd step of capacity by
closing a dry contact connected between terminals 13
& 17. See Fig. 24 for location of this terminal. The lead
system will remain totally unloaded as long as the con-
tacts remain closed on both 13 & 16 and 13 & 17. It
should be noted that terminals 13 & 17 are normally
used for Remote Setpoint Reset. However, it is assumed
that if the lag system is purposely being shut down,
Remote Setpoint Reset and temperature control is of
no importance. This is generally true since capacity
control of the load is lost when a large portion of the
capacity is disabled.
CAUTION: Two cautions should be observed when us-
ing these functions. Observing these cau-
tions will assure that undesirable operation
does not result.
1. Terminals 13 & 17 contact should al-
ways be closed after or simultaneous
with those on 13 & 16, when unloading
of the lead system is desired. Other-
wise, the microprocessor may mistake
the closed contacts on 13 & 17 as a
signal for a setpoint reset.
2. Terminal 13 & 17 contact should always
be opened before or simultaneous with
those on 13 & 16 when loading is de-
sired. Otherwise, the microprocessor
may mistake the closed contacts on 13
& 17 as a signal for a setpoint reset.
FAN CONTROL STRATEGY ABOVE 25°F AMBIENT
The chiller is equipped with 8 condenser fans; 4 per
system. The standard fan control strategy is fan cycling
by outdoor ambient temperature, with the low ambient
cut-out (chiller shut down) set at 25°F.
Above 25°F ambient, 2 fans on a respective system will
turn on 4 seconds after the compressor starts. These
fans will continue to run until the compressor shuts
down. These fans are designated as Fans 2 & 4 on
SYS 1, Fans 6 & 8 on SYS 2, Fans 10 & 12 on SYS 3
and Fans 14 & 16 on SYS 4.
If the ambient temperature is above 45°F, 2 more fans
on a respective system will start after the compressor
has run for 30 seconds. These two fans will continue to
run until the compressor shuts down or until the ambi-
ent temperature drops to 40°F. These fans are desig-
nated as Fans 1 & 3 on SYS 1, Fans 5 & 7 on SYS 2,
Fans 9 & 11 on SYS 3 and Fans 13 & 15 on SYS 4.
Locations of the fans and a chart showing the opera-
tion outlined above is shown in Fig. 35.
For operation below 25°F, a Low Ambient Kit MUST be
installed. See page 84.
LD01947
SYS 1 SYS 2 AMBIENT
AMBIENT
SYS 3
SYS 4
AMBIENT AMBIENT
FANS
FANS
ON
OFF
FANS
FANS
ON
OFF
2 & 4
6 & 8
25°F
24°F
10 & 12
14 & 16
25°F
24°F
1 & 3
5 & 7
45°F
40°F
9 & 11
13 & 15
45°F
40°F
FAN 35
FAN LOCATIONS
Содержание YDAJ87KU6
Страница 4: ...YORK INTERNATIONAL 4 FIG 1 UNIT COMPONENTS Typical on each of the two modules 00023TG 00024TG...
Страница 5: ...FORM 150 75 NM2 5 YORK INTERNATIONAL FIG 1 UNIT COMPONENTS Cont d LD01910 00025TG...
Страница 24: ...YORK INTERNATIONAL 24 MASTER MODULE WIRING DIAGRAM LD01933 FIG 17 MASTER MODULE CONNECTION DIAGRAM...
Страница 30: ...YORK INTERNATIONAL 30 SLAVE MODULE WIRING DIAGRAM FIG 20 SLAVE MODULE CONNECTION DIAGRAM LD01941...
Страница 99: ...FORM 150 75 NM2 99 YORK INTERNATIONAL...