Lochinvar 399 - Manual (Page 44)

Hydronic Heating Boilers and
Domestic Water Heaters
44
OPERATION Continued
Note: * indicates the setting is only available in the advanced access level
** units listed in KBtu
Adjust Menu Setting Descriptions
BOIL MAX
Maximum boiler target supply temperature [either 200°F
(93°C) or 250°F (121°C)].
SEn
Select whether staging is based on the boiler inlet or outlet
sensor.
Set Point TARGET (1, 2, 3, or 4)
Temperature set point target for stages 1, 2, 3, or 4. Typically,
users set the four different stages a few degrees apart. This
allows segments of the heater to come on as the temperature
drops.
DIFF (1, 2, 3, or 4)
Temperature differential for stages 1, 2, 3, or 4.
STG DLY
Stage delays can be set as follows:
Btu/hr Input Stages
399,999 - 500,000 1 and 2
650,000 - 750,000 1,2 and 3
990,000 1,2 and 3 or 1,3 and 2
1,260,000 - 2,070,000 1,2 and 3,4 or 1,3 and 2,4
ΔT MIN
Set temperature at which purging stops.
ΔT MAX
Set temperature at which
ΔT Max Error Code is generated.
UNITS
Set temperature reading at either °F or °C.
OUTDR START
Outdoor starting temperature.
Mode 1 Mode 1
(no outdoor sensor) (outdoor sensor) Mode 2 Mode 3
STG MODE (** Models 650 - 990 ) STG MODE (** Models 650 - 990 ) STG MODE (** Models 650 - 990 )STG MODE(** Models 650 - 990 )
*BOIL MAX OUTDR START *BOIL MAX *BOIL MAX
*SEn (no system sensor) OUTDR DSGN Set point TARGET 1 *
ΔT MIN
Set point TARGET 1 BOIL START DIFF 1 *
ΔT MAX
DIFF 1 BOIL DSGN Set point TARGET 2 units
Set point TARGET 2 WWSD DIFF 2
DIFF 2 *BOIL MAX Set point TARGET 3
Set point TARGET 3 *BOIL MIN DIFF 3
DIFF 3 *BOIL MASS Set point TARGET 4 (** Models 1260 - 2070 only)
Set point TARGET 4 (** Models 1260 - 2070 only) BOIL DIFF DIFF 4
DIFF 4 Set point TARGET *STG DLY
*STG DLY *
ΔT MIN
*
ΔT MIN
*
ΔT MIN
*
ΔT MAX
*
ΔT MAX
*
ΔT MAX
units units
units
TABLE-Q
Adjust Menu Settings for Operating Modes
Menu Description
STG MODE Stage Mode
OUTDR Outdoor air temperature
BOIL TARGET Boiler target temp during outdoor
reset operation
BOIL SUP Actual system sensor temp
BOIL OUT Actual boiler supply water temp
BOIL IN Actual boiler return water temp
BOIL
ΔT Temp difference between supply
and return
TANK Actual tank temp
BOIL ON Accumulated runtime of boiler
(up to 999 hours, then resets to 0)
TABLE-R
View Menu Information