HydroTherm HeaetNet V3 KN-10, Информация пользователя

Страница: 102 / 108

APPENDIX A HeatNet
V3 2.x
Page 102
Status Screen Fault Display
There are numerous interlock switches and software
limits that are detected. Each of these, when tripped will
produce a display message, an audible beeping, and an
alarm relay closure. The fault is displayed first, then after
a second, the time the fault occurred is displayed. This
cycle will keep occurring until the fault is cleared.
These faults and interlocks are:
HIGH LIMIT:
When the high limit aquastat trips the following message
is displayed:
The high limit interlock breaks power to the ignition
control (shutting it off) and effectively removes any
chance of the gas valve receiving power. The HeatNet
series control will remain powered to display the fault,
latch the alarm relay/audible beeper, and to access the log.
The interlock is located on J5, HIGH LIMIT. Ensure
power is present on the input to the High Limit Control.
SPARE 4:
This is a reserved interlock input that is user defined. The
interlock is located on J5B, SPARE 4.
DELTA TEMPERATURE WARNING:
If the temperature difference across the boiler measured
from RETURN water to SUPPLY water exceeds the
EXCHR DELTA T RANGE, setting this message will be
displayed.
LOW WATER CUTOFF:
If there is a low water condition reported by the low water
cutoff switch this fault is displayed. Check that there is water
flow and water in the boiler. There is a reset switch located on
the LWCO box. The interlock connection is located on J5B,
LWCO.
VAR FREQ DRIVE:
The variable frequency drive, which controls a non Ametek
blower, if supported, reports this fault. It may be caused in the
event of over current or an internal VFD fault that would
cause it to shut down. If this is the case, check the fault
indicators on the VFD. The interlock is located on J5B, VFD.
GAS PRESSURE:
The gas pressure switches (high pressure and low pressure) are
connected in series, so if either trip, a fault will be reported
here. A reset switch is located on the gas pressure switches.
The interlock is located on J15B, GAS PR.
SYSTEM WATER FLOW:
Once the HeatNet series boiler receives a call for heat, it
closes the system circulator pump relay. It then waits 10
seconds or more (adjustable) to prove flow. If there is no flow,
the flow switch alarm will be set. Every 10 seconds the
circulator pump relay will cycle ON for 10 seconds and then
OFF for 10 seconds to try and establish flow. The interlock
connection is located on J5B, SYSTEM WTR FLOW.