Ascent Oil – August 2019 21
WIRING and CONTROLS
The Ascent Combi Heating System is furnished with controls and basic accessories as illustrated and described in this
manual. Control, burner and accessory instruction sheets and system wiring diagrams should be attached to this manual
for future reference.
DANGER: All wiring for installations in the United States must comply with the NEC, and any local codes.
ELECTRICAL CONNECTION - LINE VOLTAGE
POWER SUPPLY: 120 VOLT 60 HZ, 7.5 Amperes
The Ascent Combi requires 120 VAC. The supply voltage must be within 108 VAC min / 132 VAC max for reliable
operation of the boiler and the Ascent Hydrostat. An easy way to check the supply voltage is to test L1 and L2 on the
Ascent Hydrostat control.
DANGER: Make All Connections with Power Off at Main Circuit Box
Figure 3A: Connect power from a separate 15 AMP fused circuit. Install 3
rd
wire grounding for proper bond between all
electrical accessories. The system switch is included so power can be shut off at the unit for servicing.
Pigtails are provided for the line voltage power connection. Connect black pigtail to hot, white pigtail to neutral, and the
green pigtail to ground.
LOW VOLTAGE WIRING
WARNING: Make All Connections with Power Off at Main Circuit Box
A typical low voltage wiring diagram for the Energy Kinetics Ascent Combi and Ascent Plus Combi is shown in the
“Zone Control” section of this manual. Thermostats must be located on inside walls away from cold drafts, windows or heat
from fireplaces, appliances or sunlight. Set thermostat heat anticipators to hydronic or 0.4 amps (or "gas" if gas/electric
option). Call Energy Kinetics to request alternate low voltage wiring diagrams to handle special situations such as air
handler wiring, heat pump wiring, Wi-Fi and power stealing thermostats, or isolation relays for thermostats.
ASCENT HYDROSTAT CONTROL
The Ascent Hydrostat control is the operating and limit control for the Burner, Bypass Circulator, and Heating Circulator.
The high and low limit is field adjustable to meet the needs of the installation; see recommended settings below. The control
has an Automatic reset High Limit (AHL) and a Manual reset High Limit (MHL) the AHL is field adjustable the MHL is factory
set at 250°F and requires a manual reset of the control. The control has circulator relay terminal designations C1 and C2
(internally connected to Neutal) to operate the Heating circulator when a switch closure is made at the TT terminals. The
boiler must be at or above the condensation protection temperature (145°F) of the control in order for the circulator to
operate. The Burner will fire when the TT switch closure is made up to the AHL setting and will continue until the call for
heat is satisfied. The Ascent Hydrostat control ZR connection is used to register the output of a hot water flow switch. The
ZC terminal supplies power to the integrated bypass/hot water circulator. The bypass circulator has a 5 minute overrun to
allow hot water production at low flow rates.
HYDROSTAT CONTROL SETTINGS
Auto Reset High/Operating Limit (AHL)
180º F* (up to 220º F Maximum)
10º Differential* (20º, 30º optional)
170º F with 25º F Differential*
Manual Reset High Limit (MHL)
Auto Reset Low Water Cut-off
* Factory Setting.
Do not set Low Limit (LL) below 170°F for heat and hot water applications.
See Ascent Hydrostat for further information.
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