York YCAQ10 - Page 28

28 YORK INTERNATIONAL
SINGLE CIRCUIT UNITS
Pages 29 & 30 show a listing of each cooling range code
along with the temperatures at which each stage loads
and unloads.
C. Determine whether the “Desired LWT Setpoint” falls
into the range from –9.9 to 0°C or 0 to 9.9°C.
1. If the “Desired LWT Setpoint” falls into the tempera-
ture range from –9.9 to 0°C, place SW1 on the Mi-
cro Logic Board to the OFF position (See Page 32).
This places a minus sign in front of the setpoint
dialed into the setpoint switches.
2. If the “Desired LWT Setpoint” falls into the tempera-
ture range from 0 to 9.9°C, place SW1 on the Mi-
cro Logic Board to the ON position (see Page 32).
D. Set the two Setpoint Switches to the “Desired LWT
Setpoint” selected in Step B.
i.e.: 4,4 = 4.4°C from Step B if SW1 on the Micro
Logic Board is ON (Step B). (See Fig. 22).
FIG. 22 – LWT SETPOINT SET AT 4, 4 (4.4°C)
E. Set the Cooling Range Switch to the coded number
which represents the desired cooling range selected
in Step B.
i.e.: Code “3” = ± 0.84°C from Step B. (See Fig. 23).
F. Verify the Setpoint by placing the Display Select
Switches to 0,5. The Setpoint displayed will equal that
set in Step D.
i.e.: 4.4 will be displayed (from Step D) if the Display
Select Switches are set to 0,5.(See Fig. 24).
FIG. 24 – SELECT DATA DISPLAY SWITCHES SET
AT 0, 5
G.See pages 29 & 30 for determining loading and un-
loading points.
FIG. 23 – COOLING RANGE SWITCH SET AT 3
(0.84°C)
LD01861
LD01862
LD01863