Boiler Control - RBI IEW-199 Installation And Operation Instructions Manual

BOILER CONTROL: INTERNAL WIRING & OPERATION
C. BOILER CONTROL
1. DHW Modes:
The Infinite Energy control enables the installer to
choose from 3 different domestic hot water (DHW)
modes. Table 8.1 provides a brief overview of the
available modes. The following are detailed
explanations of the DHW modes.
Mode 1 – DHW Store with Sensor: In this mode, the
control accepts a temperature input from the domestic
tank sensor that is included with the boiler. This
sensor provides the DHW water temperature value to
the control. The control targets the user selected DHW
setpoint and modulates the boiler firing rate
accordingly.
WARNING
Be sure to use only the tank sensor provided. Other
sensors will not provide accurate tank temperatures
and may cause severe personal injury due to
scalding.
DANGER
Water temperatures over 125°F (52°C) can instantly
cause severe burns or death from scalding. Children,
elderly and disabled individuals are at the highest
risk of scalding. See instruction manual for the
indirect tank before setting the water heater
temperature. Instruct users to feel the water
temperature before bathing or showering. Anti-scald
valves are recommended.
Mode 2 – DHW Store with Thermostat: In this mode,
the control is connected to the DHW tank temperature
limit. When the limit closes, the control modulates the
boiler firing rate to target a boiler supply setpoint. This
setpoint is a user selected value with a factory default
of 160°F (71°C). The allowable range for this value is
120°F (49°C) to 195°F (91°C).
NOTICE
The "Store Warm Hold" function will not be functional
if the DHW tank mode is set to 2. This requires a
DHW tank sensor.
The control will reduce the boiler firing rate if the vent
temperature approaches the vent temperature limit. If
the vent temperature continues to rise, the control will
shut down the boiler.
Mode 3 – DHW Store with 0-10 VDC Input: In this
mode, a 0-10 VDC signal corresponding to the
desired setpoint temperature is provided to the 852-1
Interface Board by an external source. The following
chart shows the corresponding setpoint for various
temperatures.
32
Input Signal
Setpoint
(VDC)
(°F)
0 50.0
1 64.5
2 79.0
3 93.5
4 108.0
5 122.5
This mode is commonly used in conjunction with a
Building Management System (BMS) to control the
boiler setpoint based on the building hot water
requirements.
2. Max DHW Pump:
This feature limits the maximum time that the DHW
pump runs to allow the supply and return
temperatures to equalize after the burner shuts down.
The default time for this option is 15 seconds. It is
adjustable from 0 to 255 seconds.
3. Supply Return TDiff:
The control runs the DHW pump until the difference
between the supply and return temperature are below
the TDiff value.
The default value is 4°F (2°C), which means that if the
supply is 120°F (49°C) and the return is 116°F (47°C)
the pump will stop operating.
4. Installation Location & Vent Material:
The Infinite Energy boiler allows the installer to input
the installation location and the vent material used.
This information is used to determine the suitable
vent temperature limit based on National Codes.
Table 8.6 shows the vent temperature limit based on
the location and vent material.
Table 8.6: Vent Temperature Limits
Vent Limit Temperature
Vent
Material
PVC
CPVC
PP(s)
5. Freeze Protection:
The Infinite Energy boiler control is intended to prevent
the central heating system from freezing. The default
temperature to activate this function is 50°F (10°C).
If the supply temperature drops to below the freeze
protection setpoint, the general pump and/or the CH
pump (depending on pump mode) will be activated. If
the supply or return temperature drops more than 9°F
(5°C) below the setpoint, the control lights the boiler
using the ignition sequence described in section 8.B.
Input Signal Setpoint
(VDC) (°F)
6 137.0
7 151.5
8 166.0
9 180.5
10 195.0
Location
U.S.A. Canada
190°F 149°F
(80°C) (65°C)
230°F 190°F
(110°C) (80°C)
230°F 230°F
(110°C) (110°C)