York YLAA0195HE, Manual, Page: 134 / 206

JOHNSON CONTROLS
134
FORM 150.72-NM3 (1020)
ISSUE DATE 10/05/2020
SECTION 6 – COMMISSIONING

4. Put the unit into Service Mode (as described un-
der the “Service and Troubleshooting” section of
this IOM) and cycle each condenser fan to ensure
proper rotation.

5. Prior to this step, turn system 2 off (if applicable
refer to Option 2 under the “Unit Keys” sec -
tion of this IOM for more information on system
switches). Connect a manifold gauge to system 1
suction and discharge service valves.
Place the Unit Switch in the control panel to the
“ON” position. As each compressor cycles on,
ensure that the discharge pressure rises and the
suction pressure decreases. If this does not oc-
cur, the compressor being tested is operating in
the reverse direction and must be corrected. After
verifying proper compressor rotation, turn the
Unit Switch to “OFF.”
The chilled liquid setpoint may need to
be temporarily lowered to ensure all
compressors cycle “on.”
This unit uses scroll compressors
which can only operate in one direc -
tion. Failure to observe this will lead
to compressor failure.

6. Turn system 1 “OFF” and system 2 “ON” (refer
to Option 2 under the “Unit Keys” section of this
IOM for more information on system switches).
Place the Unit Switch in the control panel to the
“ON” position. As each compressor cycles “ON”,
ensure that the discharge pressure rises and the
suction pressure decreases. If this does not oc-
cur, the compressor being tested is operating in
the reverse direction and must be corrected. After
verifying proper compressor rotation, turn the
Unit Switch to “OFF”.
The chilled liquid setpoint may need to
be temporarily lowered to ensure all
compressors cycle “ ON ”.
OPTIONS
Display Language
Sys 1 Switch
Sys 2 Switch
Chilled Liquid
* Ambient Control
Local/Remote Mode
Control Mode
Display Units
* Lead/Lag Control
* Fan Control
Manual Override
Current Feedback
** Soft Start
** Unit Type
** Refrigerant Type
** Expansion Valve Type
COOLING SETPOINTS
Cooling Setpoint
Range
EMS-PWM Max. Setpoint
PROGRAM
Discharge Pressure Cutout
Suct. Pressure Cutout
Low Amb. Temp. Cutout
Leaving Liquid Temp. Cutout
Anti-Recycle Time
Fan Control On Pressure
Fan Differential Off Pressure
Total # of Compressors
* Number of Fans/System
* Unit/Sys Voltage
Unit ID
* NOT ON ALL MODELS
** VIEWABLE ONLY
TABLE 7 – SETPOINTS ENTRY LIST