HTP EFTU Series Installation Instructions

LP-743 Rev. 000 Rel. 000 Date 8.25.20
14
25 2 DOMESTIC HOT WATER - Applicable for Downstream / System IWH
25 2 0
DHW Setpoint Temperature WCN Models 97 - 140°F 125
DHW Setpoint Temperature WBN Models 104 - 140°F 125
Establishes DHW temperature for the entire cascade system, including WCN boilers and Upstream IWH connected to individual
boilers. Not applicable to Downstream IWH when Master parameter 25.2.2 = 2, or to Upstream IWH connected to Follower
when parameter 34-40.2.8 = 2, or Master when parameter 2.2.8 = 2 (and 25.2.2 = 0). Also settable by pressing the DHW +/-
buttons from the home screen.
25 2 1
DHW Comfort Function (only applicable to WCN
Models)
2 = Always On 2
Comfort function keeps the DHW heat exchanger of a WCN boiler warm when a DHW demand is not active, thereby re-
ducing the amount of time needed to heat the hot water when a demand occurs. Function activates conditionally once
per Comfort Anti-Cycling Time, par 2.5.1 on the Master boiler, par. 34-40.5.1 on Follower boilers.
To deactivate DHW Comfort Function of a Master boiler set par 2.0.1 = 0. To deactivate DHW Comfort Function at a
Follower boiler set par 34-40.0.1 = 0.
25 2 2 System DHW Mode
0 = CH Only
1 = DHW Tank NTC
2 = DHW Tank Thermostat
0
25 2 3 Anti-Legionella Function
0 = O
1 = On
0
25 2 6
System DHW Charging Priority
0 = Alternating
1 = Timed Concurrent / Alternating
2 = Concurrent
0
0 = Alternating – DHW and CH will not operate simultaneously. Priority switches between DHW and CH at an interval de-
ned by the CH/DHW Shifting Priority Time (parameter 25.0.8); rst priority is DHW. If 25.0.8 = 0, then DHW has priority
indenitely.
1 = Timed Concurrent / Alternating – DHW and CH operate simultaneously for the period dened by the CH/DHW Shi-
fting Priority Time (parameter 25.0.8). After the time elapses operation returns to Alternating until the end of the DHW
request.
2 = Concurrent – DHW and CH can operate simultaneously indenitely.
25 2 7
DHW Modulation Setpoint 68 - 179
o
F 179
System target temperature during a DHW demand. Not applicable for WCN models.
25 2 8
DHW On Dierential Temperature 0 - 36
o
F 0
Determines how much the DHW storage tank temperature can drop below target before initiating a DHW demand. Only
applicable when 25.2.2 = 1.
25 3 SYSTEM DIAGNOSTICS - READ ONLY
25 3 0 System CH Supply Setpoint Actual calculated System CH Target temperature
25 3 1 System Supply Temperature (in
o
F) Actual temperature read by System sensor
25 3 2 Outdoor Temperature (in
o
F) Only with outdoor sensor connected
25 3 3 DHW Storage Temperature (in
o
F) Only with NTC tank sensor connected and 25.2.2 = 1
25 3 5 System Pump Status 0 = OFF, 1 = ON
25 3 6 DHW Pump Status 0 = OFF, 1 = ON
25 4 CASCADE DIAGNOSTICS - READ ONLY
25 4 0 Cascade Power Level (in %)
25 4 1 Total Number of Cascaded Boilers
25 4 2 Available Cascaded Boilers Does not count operating or locked out boilers
25 4 3 Active Cascaded Boilers Boilers currently operating
Menu
Sub-Menu
Parameter
Description Value
Default
Setting

HTP EFTU Series Specifications

General

Brand	HTP
Model	EFTU Series
Category	Boiler
Language	English