New Yorker AP-U AP-110U-N, Installation, Operating And Service Instructions

29

110839-01 -8/20

AP-U

Installation & Service Manual

WARNING: DO NOT ADD WATER UNTIL THE 
BOILER HAS FULLY COOLED.

To activate Manual Reset LWCO mode

1. Turn the LO TEMP dial to access the   

    Program Mode - indicated in the display as  

    Pro

2. Turn the HI TEMP dial to select feature 3

3. Push the Test/Setting Button to A for    

    Automatic Reset Mode

4. Reset LO TEMP and HI TEMP settings to  

desired temperatures.

To Test the Manual Reset Feature:

Press and hold the 

Test/Settings button located on the top of the control 

for 30 seconds to simulate a low water condition. After 

30 seconds, the Low Water light will blink indicating 

that the control is locked out. To reset the lock-out 

condition, press the Test/Setting button momentarily.

 4. 

Circulator Activation Options

When in the default mode, the HydroStat  

activates the circulator (

C1/C2 

contacts) on  

calls to

TT

. 

The control can be programmed  

to activate the circulator on calls to

ZC/ZR

 in  

place of, or in addition to

TT

.

To change how the Circulator is activated

1. Turn the LO TEMP dial to access the   

    Program Mode - indicated in the display as 

    Pro

2. Turn the HI TEMP dial to select feature 4

3. Push the Test/Setting Button to select   

    between the following options:

A - Circulator on

 TT 

call only

b - Circulator on

ZC/ZR 

calls

C - Circulator on both

 TT

 & 

ZC/ZR 

calls

4. Reset LO TEMP and HI TEMP settings to  

desired temperatures.

    5. 

Circulator Hold Off (Enhanced Condensing  

 Protection)

To reduce the potential for condensing, On  

a call for heat the control will allow  

the boiler to heat to 125oF prior to energizing   

the circulator. Once energized, the circulator  

will remain on for the duration of the heating  

call unless the boiler temperature drops below  

115oF.  If this occurs, the circulator will    

re-energize when the boiler returns to 125oF.  

Circulator Hold Off will expire after 15    

 minutes.

To activate Circulator Hold Off

1. Turn the LO TEMP dial to access the   

    Program Mode - indicated in the display as  

    Pro

2. Turn the HI TEMP dial to select feature 5

3. Push the Test/Setting Button to Circulator  

    Hold Off ON or OFF

4. Reset LO TEMP and HI TEMP settings to  

    desired temperatures.

   6. 

Setting the Well Type (Elctro-Well vs.    

Standard  Immersion Well)

When used to replace older temperature- 

only controls, the HyrdroStat can be installed  

on the existing   well. (The Hydrolevel Elctro- 

Well is required to activate low water cut-off  

operation. Older wells may contain hardened  

heat transfer grease or other contaminants  

that could interfere with metal-to-metal    

continually between the sensor head and the  

inside of the well. Insufficient contact could  

lead to false low water conditions and burner  

shut downs. Setting the well type to  

Standard Well prevents the possibility of  

this occurring.

To change the well type

1. Turn the LO TEMP dial to access the   

    Program Mode - indicated in the display as  

    Pro

2. Turn the HI TEMP dial to select feature 8

3. Push the Test/Setting Button to select A for  

    Electro-Well or b for Standard Well.

NOTE: To ensure that the low water cut-off is always 

active when the control is installed on an Electro-

Well, setting b will ONLY be available when installed 

on a standard well. The HydroStat sensor checks to 

determine if a standard well is used by looking for low 

resistance to ground, a condition that can only exist 

with a standard well. If you are installing on a standard 

well and either Low Water LED’s are on, setting b 

will not be available. Check to see if the inside of 

the well tube is badly oxidized or contaminated with 

heat transfer grease. It may be necessary to clean 

the well to allow for setting b to be selected (See 

Troubleshooting Guide for more information).

7. 

High Limit Differential

When the Economy feature is on, the    

control’s Thermal Targeting feature  

actively sets varying differentials based on  

system conditions. This option allows for  

selecting a 10, 20 or 30 degree  fixed    

differential when the Economy feature    

is turned OFF. These optional differential  

settings are subtractive from the HIGH LIMIT  

 setting. 

Note: 

If the Economy feature in on,  

this setting will be overridden by the control’s  

Thermal Targeting function.

To change the high limit differential

1. Turn the LO TEMP dial to access the   

    Program Mode - indicated in the display as  

                 Pro

2. Turn the HI TEMP dial to select feature 9

3. Push the Test/Setting Button to select a  

    high limit differential of 10, 20, or 30

4. Reset LO TEMP and HI TEMP settings to  

    desired temperatures.

8

 Operating 

(continued)