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1. Readings
of
inlet
temperatures as well as ΔT temperature
rise.
2. Eight pre-set modes of operation; mode 1,
2, 4, and 5 for heating, mode 3 for DHW
and mode 6, 7 and 8 for operation by a
remote controller.
3. Operation as an auto reset limit.
4. Operation as a control for inlet water
temperature.
5. Optional tank mounted sensor used in
conjunction with inlet sensor.
6. Adjustable pump delay feature based on ΔT
temperature difference between inlet and
outlet temperatures. Accepts 1/6 hp. pump
directly across terminals 13 & 14.
7. Adjustable;
target
differential, on delay between stages,
minimum on time per stage, minimum off
time per stage.
8. Display of run hours for maintenance
purposes. Counter wraps around at 1000
hours.
9. Flame failure signal 24 V.
10. Molex connector for ease of service.
11. Error message display.
12. Test
override
operation, stages 1, 2, 3, 4, and 5 and
alarm.
13. Pump exercising feature runs pump 10
seconds every three days of no pump
operation.
Setting the Appliance Temperature Control
Press and hold the ITEM, UP and DOWN
buttons simultaneously for 1 second. The
appliance will shut down and pressing the
ITEM key and then selecting the desired
setting using the UP, DOWN buttons, can
now make the settings. Pressing the ITEM
key again will cause the last setting to be
accepted. Once all settings have been made
wait for 30 seconds for the control to return
to normal operating mode. In normal
operating mode the inlet temperature, outlet
temperature, ΔT temperature and ON hours
can be viewed by repeatedly pressing the
ITEM key only. If you wish to check the
setting you will have to start again by
pressing and holding the ITEM, UP and
DOWN buttons simultaneously for 1 second,
and then use only the ITEM key to scroll
through the settings. After checking the
settings allow the control to return to normal
operation on its own.
and
outlet
water
temp,
inter-stage
feature
to
test
pump
Mode 1 is intended for hydronic heating. The
set-point for inlet water control is pre-set to
180°F and the auto re-set limit is set to 230°F.
The inlet set-point can be adjusted, however the
limit is fixed. In addition to the auto reset limit the
factory installs a manual re-set limit set to 250°F.
The control turns on the appliance pump and
stages the appliance to maintain set-point target
temperature at the appliance inlet temperature
whenever an external heat demand is present.
Once the external heat demand is removed, the
control turns off the appliance and operates the
appliance pump based on the purge feature
Mode 2 is intended for hydronic heating. The
set-point for inlet water control is pre-set to
180°F and the auto re-set limit is set to 230°F.
The inlet set-point can be adjusted, however the
limit is fixed. In addition to the auto reset limit the
factory installs a manual re-set limit set to 250°F.
The control turns on the appliance pump and
stages the appliance to maintain set-point target
temperature at the appliance inlet temperature
whenever an external heat demand is present.
Once the external heat demand is removed, the
control turns off the appliance and operates the
appliance pump based on the purge feature.
The control turns on the appliance pump and
stages the appliance to the set-point target
temperature
at
whenever an external heat demand is present.
Once the last appliance stage turns off and the
heat demand is still present, the control then
operates the appliance pump based on the
purge feature. In this case, it is imperative that
the system pump operates continuously in order
to provide constant circulation past the system
sensor. The appliance pump then turns back on
with the first stage of the appliance. If the heat
demand is removed, the appliance is turned off
and the control operates the appliance pump P1
based on the purge feature.
19
the
system
temperature
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