HTP 850 LPHL User Manual
Page 54
54
LP- 205 REV. 3.28.14
6
0 min.
Changes the indirect circulator post purge time once the sensor is satisfied.
(NOTE: Post purge time should be set no greater than 5 minutes.)
Range: 0 to 10 minutes
7
68
o
F
Outdoor temperature that will disable central heating (warm weather shutdown)
Range: 41
o
F to 122
o
F
DEFAULT
FUNCTION
VALUE
DESCRIPTION
*8
5
o
F
Changes the minimum outside design temperature
Range: -49
o
F to 32
o
F
*9
180
o
F
Changes the design supply water temperature based on the minimum outside design temperature range
Range: 77
o
F to 190
o
F
*10
68
o
F
Allows the installer to change the maximum outside design temperature for central heating.
Range: 95
o
F to 32
o
F
*11
95
o
F
Changes the design supply water temperature from the boiler based on the maximum outside design temperature
Range: 32
o
F to 190
o
F
12
68
o
F
Sets the lowest temperature for central heating.
Range: 32
o
F to 190
o
F
13
0 min.
Changes the central heating circulator post purge time once the thermostat is satisfied.
Range: 0 to 10 minutes
14
30 min.
Sets the maximum run time for the indirect fired water heater and the minimum run time for central heating.
Range: 0 to 60 minutes
15
0
Bus address (Cascade 8 Boiler Max)
(0 = master 1 – 7 = follower)
NOTE: Never address boiler with number 8.
Range: 0 to 8.
16
0
Allows the installer to connect a 0-10 volt directly from Building Management System.
To activate, change value to 2.
WARNING: Values 1 and 3 are not to be programmed into the board.
Range: 0 - 3.
17
0
Controls the function of the 0-10 volt input
0 = boiler temperature, 1 = boiler power
18
1
Step Modulation – regulates the burner output in 6 steps in one-minute intervals. This reduces short cycling.
1 = on, 0 = off
19
180
o
F
Indirect boiler set point (flow)
Range: 119
o
F to 180
o
F
20
3
Low water cut-off. Do not change.
0 = none, 1 = water pressure switch, 2 = flow switch, 3 = low water cut-off (default)
21
0
Sets the control to display
FOU
error. If outdoor sensor is open or shorted,
FOU
error does not prevent the boiler from
running.
0 = No
FOU
displayed.
1 =
FOU
displayed.
22
100%
This parameter can be adjusted to lower the maximum boiler output. Default = 100%.
Ex: 500 boiler setting at 80% will go to 400,000 BTU/hr max rather than 500,000 BTU/hr.
Range: 50 – 100%.
23
0
Cascade configuration (Default 0).
Change this to 1 if the boiler is a cascade master.
24
24
Sets how many power on hours will go by before the priority appliance will be rotated in the cascade system.
Range: 0 - 240
25
0
N/A must be at 0.
26
---
System pump freeze protection. Default – disabled.
Use this function on a cascade master to activate the system pump if the outdoor temperature drops below the set
value. Use the
{S2}
key to increase from the default disabled upward to the desired temperature.
Range: --- disabled to 104
o
F
27
0
Parameter set on 0 then
E03
will be displayed if system sensor fails. Parameter set on 1, no code will be displayed if
system sensor fails.
0 =
E03
, 1 = no code displayed.
28
0
Parameter set on 0 = Frost protection active.
Parameter set on 1 = Frost protection disabled.
29
0
Parameter set on 0 = Normal DHW modulation
Parameter set on 1 = DHW will begin modulation on low rather than high fire