ENVI
®
Control
20
1.6.3
DHW Settings
Parameters
CH settings
DHW settings
Boiler settings
Parameters
CH settings
DHW settings
Boiler settings
From the PARAMETERS menu use
and
to move the cursor to DHW settings then press
to
access the domestic hot water parameters listed in the table below. Alternatively, pressing
at the default
(home) screen also accesses the DHW SETTINGS menu.
1.6.3.1
Domestic Hot Water (DHW) Parameters and descriptions
ENVI
®
Text Display
Function
Range
Units
Passcode
Level
DHW mode
None = 0
Storage & Sensor = 1
Storage & Stat = 2
Plate HX = 3
Type of System
0 = No Domestic Hot Water
1 = Storage Tank with Temperature Sensor
2 = Storage Tank with Thermostat
3 = Plate Heat Exchanger w/Flow Switch
0
– 3
SVC1
DHW Type
CH/DHW = 0
DHW Priority = 1
3 Way Valve NC = 2
Domestic Hot Water Operation Type
0 = Simultaneous CH and DHW Pumps
1 = DHW pump has priority over CH pump
2 = 1 Boiler Pump:
when 3 way valve Normally Closed = DHW
when 3 way valve Powered Open = CH
0
– 2
SVC1
DHW setpoint
Setpoint for Domestic Hot Water Output
86
– 185
°F
User
Tank set
Setpoint of Storage Tank (DHW mode 1)
104
–162 °F
User
ON different
Boiler On Differential
0
– 36
°F
SVC1
OFF different
Boiler Off Differential
0
– 36
°F
SVC1
Tank off dif
Tank Off Differential (DHW mode 1)
0
– 36
°F
SVC1
Tank on diff
Tank On Differential (DHW mode 1)
0
– 36
°F
SVC1
Post pmp Time
DHW Post Pump Time
0
– 255
Sec
SVC1
Prop band
Proportional Band
0
– 230
°F
SVC2
Integral RTE
Integral Rate
0
– 255
Sec
SVC2
DER time
Derivative Time
0
– 255
Sec
SVC2
Pwr lmt step
(ver. 8C51, 1043)
Power limit step limits the intervals of rate while driving
towards high fire (the lower the value, the slower the step;
the higher the value, the faster the step)
0
– 255
units
SVC2
PMP on demand
(ver. 79F2, 8C51, 1043)
With the NO selection the boiler pump only runs when
there is a need to fire the boiler.
With the YES selection the boiler pump runs when an
enable signal is present.
This is overridden by the BLR OP setting
No / Yes
SVC2
Priority Time
(ver. 79F2, 8C51, 1043)
The maximum amount of time the domestic hot water
operation has priority over the comfort heat operation.
Timer is reset and starts when the domestic hot water call
is enabled.
0
– 255
Min
SVC1
