HeatNet Smith Series, Руководство пользователя, Страница: 52 / 82

DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control REV 1.38-1
Page 52
BASE LOAD BOILERS
BASE LOAD
BOILERS:
0 0-1
This setting works in conjunction with the ADVANCED
SETUP: SYSTEM:OPTION setting BASE LOAD. Currently
only (1) base load boiler is supported using relay K8 on the
Version 2.x control.
START >MOD
(START>MOD,
START<OA T,
START>RET)
Used in Conjunction with DELAY TIME.
START>MOD 100% (20–100) The base load relay K8 will close when the Modulation is >%.
START<OA T (40–140) The base load relay K8 will close when the OA temp is > T
START>RET (60–150F)
The base load relay K8 will close when the Return temp is >
T.
STOP FIRST
(FIRST,
STOP<MOD,
START>OA T,
START>RET)
STOP<MOD 20% (20–100) 20% (20–100) The base load relay K8 will open when the Modulation is <%.
STOP>OA T (40–100F) The base load relay K8 will open when the OA temp is > T.
STOP<RET (60–150F)
The base load relay K8 will open when the Return temp is <
T.
DELAY TIME 0 (0–60 minutes)
This setting allows a wait time before firing the base load
boiler once the start condition is met.
SENSORS
Sensors can only be changed when there is no call for heat. The boiler must be in STANDBY.
SENSOR #
The first (4) sensor #’s are reserved as: OUTSIDE AIR,
water SUPPLY outlet, water RETURN inlet, and system
HEADER temperature. If the HEADER sensor is used
(TYPEZ), that boiler performs the tasks of the MASTER
boiler. If the HEADER sensor is set to NONE, its function is
the MEMBER. The remaining (2) sensors perform as user
selections and provide functions such as: Combustion Air
Proving.
TYPE
There are (4) sensor types:
NONE = do not use this sensor
TYPEZ = 10k thermistor
ON/OFF = 5 volts supplied out to detect a contact/switch
closure.
CALIBRATE
Placing a precision 10k (TYPEZ) precision resistor across
the sensor input selected allows calibration of the sensor
input.
4–20mA INPUT
4mA SETPOINT 50
°
F 50-220
°
F
When using 4-20mA setpoint control in
SETPOINTS:SETPOINT SOURCE. This is the temperature
when a 4ma signal is applied and is tied to the BOILER
START mA. The Setpoint will then be mapped from 4mA –
20mA and example default of: 50-220F
20mA SETPOINT 220
°
F 50-220
°
F
This is the setpoint temperature when a 20mA signal is
applied.
BOILER START 4.11mA 3.71-5.0mA
This is the current value which will start the boiler. There is a
.1mA hysteresis value. So if the Boiler starts at 4.11mA it
shuts off a 4.01mA.
PRIORITY NORMAL
If the Priority is set to NORMAL, the boiler responds to its
HEAT DEMAND inputs in the Priority that is outlined in the
Control Methods section. If the PRIORITY is set to
HIGHEST, The 4-20ma input responds at the highest Priority
level (same as the AA input). This method may be used by
an external control to override the HeatNet control and fire
the boiler using this external control (external control
override). This allows for complex DHW control systems.