York YCUL0072EE User Manual

JOHNSON CONTROLS
144
Form 150.63-NM9
Issue date: 5/20/2021
SECTION 8 – UNIT OPERATION
Condenser fan control - YCUL0020 – YCUL0072
Table 21 - YCUL0020 – YCUL0072 Low Ambient Condenser Fan Control – Discharge Pressure Control
FAN
STAGE
ON OFF
CONTACTOR
I/O BOARD
OUTPUT
FAN #
SYS 1 SYS 2 SYS 1 SYS 2 SYS 1 SYS 2
1
1 FAN
REV
DP > Fan Ctrl On
Press
DP < Fan Ctrl On Press
– Di󰀨. Press.
7M 10M TB7-8 TB10-8 1 REV 2 REV
2
1 FAN
FWD
DP > Fan Ctrl On
Press
+ 20 psig
(1.38 barg)
DP < Fan Ctrl On Press.) –
[Di󰀨 Press. + 20 psig
(1.38 barg)]
8M 11M TB7-9 TB10-9
3
FWD
4
FWD
3
2 FANS
FWD
DP > Fan Ctrl On
Press
+ 40 psig
(2.76 barg)
DP < Fan Ctrl On Press.) –
[Di󰀨 Press. + 40 psig
(2.76 barg)]
8M & 9M
11M &
12M
TB7-9
&
TB7-10
TB10-9
& TB10-10
1 & 3
FWD
2 & 4
FWD
Table 22 - YCUL0020 – YCUL0035 Low Ambient Condenser Fan Control – Discharge Pressure Control
FAN STAGE ON OFF CONTACTOR
I/O BOARD
OUTPUT
FAN #
Stage 1
"OAT > 25° F or
DP > ctrl_press"
"OAT < 20° F and
DP < ctrl_press - di󰀨_press"
7M TB7-8 1 REV
Stage 2
"OAT > 45° F or
DP > ctrl_press + 20
psig"
"OAT < 40° F and
DP < ctrl_press - di󰀨_press + 20
psig"
8M TB7-9 3 FWD
When Low Ambient Control of the fans is
selected, fan control will be by discharge
pressure only.

York YCUL0072EE Specifications

General

Brand	York
Model	YCUL0072EE
Category	Heat Pump
Language	English