8
SYSTEM STARTUP
HOW THERMAL TARGETING WORKS
ADVANCED FEATURES
At initial start up, the Economy Feature will be set to OFF by default. The control establishes a target temperature equal to the
low limit setting (170°F by default). In OP2, or cold start mode, the control will not fire the burner until there is an active heat or hot
water call. To test the high limit shut-off function, the Economy Dial must be turned to OFF. Once tested, restore the Economy
Dial setting.
NOTE:
• Smart DHW Priority: During a call from the hot water flow switch, the control will de-energize the circulator contacts (C1/C2)
providing priority ensuring an adequate supply of domestic hot water. The control will re-energize the heat circulator when the
flow switch is no longer calling.
Thermal Targeting technology analyzes thermostat activity and continually evaluates how much heat the house requires. When it
is very cold outside, the heat demand is high and the Ascent HydroStat will raise the boiler’s Target temperature to provide need-
ed heat to the home. When the outside temperature is milder, the heat demand is lower. During these periods, the Ascent Hydro-
Stat will lower the boiler’s Target temperature – saving fuel – while continuing to provide comfort to the house.
To improve efficiency, the EK1T Ascent Combi boiler has been equipped with advanced features designed to reduce idle loss (the
energy required to keep the boiler in standby mode).
Option 1 (OP1) – Always Ready or Plate Warming – Good Efficiency, Best Hot Water Convenience
Option 2 (OP2) – Cold-start On Demand Hot Water – Best Efficiency, Good Convenience
Option 3 (OP3) – Advanced Learning – Better Efficiency, Better Convenience
Option 4 (OP4) – Advanced Learning – Better Efficiency, Even Better Convenience
Option 1 (OP1): The EK1T Ascent Combi ships in the most convenient, but less efficient mode, Option 1, or OP1. In this mode,
the boiler will maintain through the plate heat exchanger a minimum temperature (factory set to 145°F with a LL setting of 170°F)
to ensure hot water can be instantly produced at all times. This is similar the way traditional tankless coil boilers operate although
they typically maintain significantly higher temperatures than are required by the EK1T Ascent Combi. Even in this setting, signifi-
cant savings over traditional tankless coil boilers will be realized.
Option 2 (OP2): This mode is much more efficient and the boiler operates as a cold start system for heat and hot water. The
boiler will not maintain temperature (although it may be hot for a large portion of the heating season) and may not always be able
to instantly produce hot water. A hot water draw of at least 30 seconds will enable the boiler to fire. The boiler will take roughly
2-3 minutes to reach full operating temperature, during which the boiler will send out progressively warmer pulses of water as
part of its preheat and condensation protection operation. To speed preheating and reduce water use, the boiler can be activated
instantly with a ‘double pump’: Turn the hot water on and off twice in quick succession at any fixture in the house. The boiler will
recognize this as a requirement to preheat and quickly get ready to make hot water. With a ‘double pump,’ the hot water fixture
can be left off and the boiler will preheat. The Ascent Combi is well insulated and will remain hot for over 2 hours after preheating,
so after activated, the water will be ready for an extended period of time.
Option 3 (OP3): This option is a compromise between maximum efficiency and convenience. In this mode, the boiler will learn
your schedule over the course of two weeks. The boiler will automatically preheat anytime your usage pattern indicates a hot wa-
ter draw may be imminent. This mode will use more fuel than OP2, however it will provide significant savings over OP1 as long as
your schedule is reasonably consistent. If the boiler does not correctly anticipate your schedule, the same draw patterns as OP2
will activate the boiler (30 second draw or cycling the hot water faucet twice in succession).
Option 4 (OP4): This option is a compromise between maximum efficiency and convenience. Like Option 3, in this mode, the
boiler will learn your schedule over the course of two weeks in particular by identifying periods with no hot water demand like
night time hours. The boiler will automatically preheat anytime your usage pattern indicates a hot water draw may be imminent
based on any usage in the past two weeks. This mode will use more fuel than OP2 and OP3, however it will provide savings over
OP1 and is ideal if your schedule is less consis tent. If the boiler does not correctly anticipate your schedule, the same draw pat-
terns as OP2 will activate the boiler (30 second draw or cycling the hot water faucet twice in succession).
SELECTING ADVANCED SETTINGS
The advanced settings can be activated using the red ‘Test/Reset’ button on the Ascent Hydrostat control. Pressing the button
will cycle through system parameters and eventually the advance settings options, displayed as options 1, 2, 3 or 4 (‘OP1’, ‘OP2’,
‘OP3’ and ‘OP4’). Pressing and holding the red button will cause the display to flash so the Option Mode may be selected. Once
the control is flashing, press the red button to cycle through OP1, OP2, OP3 and OP4 until you reach the desired setting. Releas-
ing the button for 2 seconds will select the last option displayed. The control will then return to the main temperature display.
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