Raypak Xfiire 1000B, Инструкция по установке и эксплуатации

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28. On multi-trial-for-ignition models, the control goes
through an inter-purge delay before additional ignition
attempts are started. If no flame is detected after the
final trial-for-ignition, the PIM enters ignition lockout
and the LED on the PIM indicates the fault code for
ignition lockout. The VERSA IC Display should also
state Ignition Lockout. To reestablish operation after
the post purge has been completed and clear lockout
error, press the reset button.
29. When the unit is firing, the firing rate of the unit is
always governed by the amount of flow sensed
through the heat exchanger, and Delta T. The less
flow, the less maximum allowable firing rate. However
the system will still modulate based on target and
supply temperature, EMS signal or Modbus Rate
modes between min firing rate and maximum
allowable firing rate according with the water flow
across the heat exchanger.
VERSA Integrated Control
The XFiire product family is equipped with a sophisticated
set of software rules intended to protect the integrity of
the equipment and at the same time guarantee the most
efficient operational point of the heater.
These software rules will prevent the heater from
cycling excessively, avoiding unnecessary stress on
the combustion chamber elements. Additionally, the
VERSA integrated control is able to anticipate required
maintenance of internal parts, and diagnose common
application problems that could lead to deterioration of the
heater, such as sudden loss of flow, overshoot of supply
temperature, excessive temperature on flue pipe, and
outlet water temperature spikes, among others.
Flow meter (Optional)
The Flow meter acts a governor for the heater, and
depending on the flow reading, the control allows the
heater to operate up to a calculated maximum firing rate as
a function of the flow rate observed. In spite of calculated
maximum allowable firing rate of the unit, the system will
still modulate to achieve target or obey an external rate
command.
FLOW METER
ASSY
F10612
Figure 43. Flow Meter
Flow Override (If optional flow meter is
installed)
In the unlikely event that the flow meter reading is
compromised, due to several possible external factors, the
user is able to override the minimum flow requirement and
permit ignition of the unit.
A A CAUTION: Sufficient water flow has to be confirmed
before enabling the flow override function. Severe heat
exchanger damage could occur if there is insufficient
flow across the heat exchanger during operation.
The flow override setting will only become visible when
the heater is alarming due an unsuccessful call for heat
as a result of insufficient flow detection. The setting can
be found under Adjust Setting within the System Settings
section.
When the “Flow Override” is activated, the user is able
to select the maximum firing rate at which the heater can
operate. The system will still modulate up to this maximum
firing rate to achieve target. The maximum firing rate is
defined by the user between minimum firing rate of the unit
up to 80%. The Flow Override function has an expiration
time of 24 hours, and must be manually reactivated for the
unit to continue operation under such conditions.
Under Flow Error (If optional flow meter is
installed)
"Under Flow Error" is only possible when the heater is
already firing. It is considered an Under Flow Error when
the flow reading drops below the operational criteria for the
heater, or is totally lost during an active heat demand.