A.O. Smith AHPM-270, User'S Information Manual

24

MEMBER SCREEN TERMINOLOGY

HOME SCREEN

“LP” 

– Low Pressure: indicates the suction line pressure on the 

low side of the system

“HP” 

– High Pressure: indicates the discharge line pressure on 

the high side of the system

“LLSV” 

– Liquid Line Solenoid Valve: indicates the position of 

the LLSV (open or closed)

“Comp”

 – Compressor: indicates the status of the compressor 

(on or off  ) “Blower” – Blower Overload Status: indicates if the 
blower motor starter is tripped on an Air to Water HPWH

“TempSet” 

– Tank Temperature Setpoint: indicates the 

desired tank temperature to be maintained

“CondFlow” 

– Condenser Flow: indicates if there is water 

flowing through the condenser

“Cond”

 – Condenser Temperature: indicates the leaving water 

temperature from the condenser

“SLT” 

– Suction Line Temperature: indicates the suction line 

temperature of the unit right before the compressor

“Evap1” 

– Evaporator 1: indicates the evaporator temperature 

of the fi rst evaporator

“CTD”

– Compressor Time Delay: indicates remaining time in 

compressor delay countdown“PTD” – Pump Time Delay: indicates 
remaining time in pump countdown, when the count down 
starts the pump turns on 

Remote Mode Indicator

 – indicates if this unit is connected 

to a master panel via Ethernet, if it isn’t then it will display a 
start button

Alarm Indicator 

– indicates if there is a system alarm, click on 

the button to see which alarm is currently triggered

Defrost Indicator

 – indicates if the unit is in a defrost cycle (in 

a defrost cycle the compressor shuts off  and lets the fans run 
to warm up the evaporator)

ALARM SCREEN

“HIGH PRESSURE” –

 indicates if the unit has alarmed out on 

high pressure

“LOW PRESSURE” 

– indicates if the unit has alarmed out on 

low pressure “SHORT CYCLE” – indicates if the unit has been 
short cycling

“OUTLET FLOW” 

– indicates if the unit has alarmed out on 

condenser water fl ow

“Evap Flow” 

– indicates if the evaporator has fl ow.

“M PROTECTION” 

– indicates if the unit has alarmed out on 

motor protection

“ESTOP” 

– indicates if the unit has alarmed out because an 

Estop has been pressed

“FAILOVER 1” 

– indicates if the unit’s temperature probe has failed

“OIL PRESSURE” 

– indicates if the unit has alarmed out on oil 

pressure

CONFIGURATION SCREEN

“TempDiff ”

 – Temperature Diff erence: sets the temperature 

difference below setpoint where the unit will turn on (only 
available if the unit isn’t in remote mode)

“Capacity”

 - Set-able value (gallons) of tanks storage capacity. 

“CondFlow” 

– Condenser Flow: indicates the fl ow-rate 

through the condenser (based on frequency read by PLC 
through integrated paddle wheel fl ow sensor)

“Low Limit” 

– Sets the lowest fl ow rate limit that the unit will 

shut off  at (enabled for Single-Pass applications only), press the 
save button to save the lower limit in a Single-Pass confi guration

“Comp HRS”

 – Compressor Hours: indicates the run hours of 

the compressor

“Purge” button

 – this button will run the pump relay for 2 

minutes to allow you to purge the system without turning on 
the units

 “Tank/Pipe” 

- Unit call probe location, probe is recommended 

inside of tank whenever possible.

STOP SCREEN

The stop screen will pop up as a confi rmation whenever the 

“STOP” button on any screen is pressed.

IP CONFIGURATION

New AO Smith units can be configured for a variety of dif-
ferent networks on the fly and the procedure is quick and 
easy to accomplish.

1.  Connect the Sim/Configuration Jumper to your AO 

Smith Systems C250 Unit you would like to confi gure.

2. 

Navigate to the “Diag” button in the bottom right corner of 
your screen and select “IP Confi guration”

Unit IP Address – This IP address is the designation for the unit 
itself, AO Smith recommends running the system on factory 
settings (ex. 192.168.1.(“Unit Number” AKA 1))