YORK INTERNATIONAL
25
FORM 150.40-NM25
SINGLE CIRCUIT UNITS
CHILLED WATER TEMPERATURE SETPOINT &
COOLING RANGE SELECTION
Select the Design Chilled Water Temp. Setpoint (leav-
ing or return setpoint) via the two leftmost rotary switches
(Fig. 16). Setpoints 40° - 70°F can be selected with stan-
dard GEII.4 REV.2** EPROM (See Fig. 25). Setpoints
of 15° - 70°F can be selected with the GEII.4 BR REV.1)
(Brine) EPROM.
CHILLED WATER TEMPERATURE SETPOINT AND COOLING RANGE SELECTION
STANDARD ENGLISH ONLY
FIG. 17 –
WATER COOLING RANGE SELECT
(SET AT “4”, 10°F)
OPTIONAL LWT Control*
From the WATER COOLING RANGE CODES listed
below, select the desired control range and set the Cool-
ing Range Code on the WATER COOLING RANGE
SWITCH (center rotary switch, Fig. 18).
NOTE: These codes are not listed on the control panel
decal.
CODE
RANGE
0
+ 1.0°F
1
+ 1.2°F
2
+ 1.4°F
3
+ 1.5°F
4
+ 1.6°F
5
+ 1.8°F
6
+ 1.9°F
7
+ 2.0°F
CODE
RANGE
0
6°F
1
7°F
2
8°F
3
9°F
4
10°F
5
11°F
6
12°F
7
14°F
*Leaving water temperatures below 15°F are not permitted, regard-
less of whether leaving or return water temperature control is se-
lected.
**The GEII.4 REV.2 may also be labeled GEII.4S REV.2. The two
EPROMs are identical.
RWT Control
From the WATER COOLING RANGE CODE SELECT
determine the appropriate control range per design and
select it via the WATER COOLING RANGE Switch (cen-
ter rotary switch) Fig. 17. The codes are listed below.
Return or Leaving Water Temperature Control is avail-
able depending on the switch configuration of the Micro
Logic Board. See Fig. 25.
SW.3 OFF: RWT Control
SW.3 ON: LWT Control
NOTE: It is recommended that RWT control be used un-
less LWT control is absolutely necessary. Leaving
water temperature control may cause compressor
cycling and temperature fluctuations.*
WATER COOLING RANGE CONTROL SELECTION
A temperature control range must be selected to deter-
mine at what temperatures the chiller will load and un-
load. This selection is usually dictated by the designed
temperature drop across the evaporator.
FIG. 16 – SETPOINT SWITCHES (SET AT 55°F)
LD01856
LD01855
