Crown Boiler BB100H - Manual (Page 22)

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VIII Start-up
The following steps must be taken in addition to those shown in the boiler instruction manual in order to commission the
Bimini Buddy:
If not already done, flush the system so that it is free of sediment, flux and any residual boiler water 1)
The Bimini Buddy must be purged of air. If it is piped in accordance with Figure 5.0, this can be done simply 2)
by opening the fill valve and making sure that the automatic air vent is open. Otherwise, the screw driver vent
shown in Figure 5.1 must be also be opened until a steady stream of water comes from this vent. After this is
done, any residual air should remove itself through the automatic air vent over the first few days of operation.
The boiler’s control system must be “programmed” to operate the 3-way valve used on the BB100I, BB100C, 3)
(the boiler control system will operate the BB100H as is). The exact method for doing this depends on the type
of control system supplied with the boiler. Two control systems are used on BWC Series boilers, one employing
the Honeywell Type III MCBA and one Employing the Honeywell Sola. See Part VII of this manual for a
description of this two systems.
In the case of the BB100C, it is important to understand that the boiler does not monitor the DHW
temperature directly; instead it monitors, and regulates, the boiler supply temperature. The boiler supply
temperature tracks the DHW outlet temperature very closely.
A. BWC Boilers Equipped with Type III MCBA
Table 8.0: Type III MCBA Parameters for BB100I, BB100C
Parameter # Description Factory
Setting
BB100I
Setting
BB100C
Setting
1 DHW Set point 135 135 110
24 DHW Modulation Hysteresis On 10 10 -4
25 DHW Modulation Hysteresis Off 6 6 6
35 DHW Configuration 13 03 01
Parameter #35=13 (Factory Setting) - Red circulator lead is only powered on a call for heat. Blue circulator lead is
powered only upon a call for DHW. Call for DHW is initiated by a set of DHW thermostat contacts. When parameter
35=13, parameter 1 plus 46F = target supply temperature during a DHW call.
Parameter #35 =03 (BB100I) - Red circulator lead is powered upon either a heating or DHW demand. Blue lead is
powered only upon a heating demand. Call for DHW is initiated by a set of DHW thermostat contacts. When parameter
35=03, parameter 1 plus 46F = target supply temperature during a DHW call.
Parameter #35 =01 (BB100C) - Red circulator lead is powered upon either a heating or DHW demand. Blue lead is
powered only upon a heating demand. Call for DHW is initiated by the DHW flow switch. When parameter 35=01,
parameter 1 = target supply temperature during a DHW call.
Parameters #24 and #25 collectively work as a “differential” for the boiler supply temperature set point. Parameter #25
determines the difference above the supply temperature at which the burner shuts off. Parameter #24 defines how far
below the target temperature the supply temperature must fall before the burner turns back on. Since Table 8.0 defines
parameter 24 as negative for the BB100C , the burner will actually restart when the supply temperature is still above the
target boiler supply temperature. For example, if the parameters are set as shown in Table 8.0 for the BB100C, the burner
will shut off when the supply temperature reaches 116F and restart when the supply falls to 114F.