DC 20-125

DC 33-160

Dual Fired Combi - Unique 2 in 1 heat exchanger eliminates the need for a Diverter valve and plate type heat exchanger.

You expect your boiler to provide enough heat water for both your kitchen and bathroom, as well as enough heat to make your home cosy and snug. Our DC Combi is designed to do just that. Whatever your exact heating and hot water requirements may be, one of our combies is sure to be a perfect match for you

· Up to 96% AFUE with full ASME-rated vessel.
· Two independent copper coils embedded in a cast aluminium heat exchanger.
· Built-in boiler pump.
· PVC/CPVC/PPs approved.
· Low lead certified.
· Self-cleaning, self-draining vertical fin heat exchanger.
· Built-in supply and return sensors control the heat exchanger temperature (versus water temperature), thus eliminating failures.
· Contractor friendly, fewer internal parts, easy to install, maintain and service.
· Outdoor reset technology increases efficiency by lowering the water temp automatically.
· Exceptional value and longevity. Over 2 million installed.
· Includes Air Vent, Outdoor Sensor & Relief Valve.
· 5 Year manufacturer’s parts warranty.
· 10 year limited heat exchanger warranty.

SPECIFICATIONDC 20-125DC 33-160
CSA Input (Natural Gas or Propane) – MBH20 – 12533 – 160
CSA Input (Natural Gas or Propane) – KW5.6 – 36.69.7 – 46.9
CSA Output – MBH18.6 – 110.830.4 – 140.0
CSA Output – KW5.4 – 32.58.9 – 41.0
DHW – CSA Input (Natural Gas or Propane) – MBH20 – 12533 – 124
DHW – CSA Input (Natural Gas or Propane) – KW95.6 – 36.39.7 – 36.3
A.F.U.E95%94%
Min gas pressure (Nat. Gas or Propane) – inch w.c.55
Max gas pressure (Nat. Gas or Propane) – inch w.c.1414
Power (120Vac/60Hz) – Watts @ full fire with internal pump130164
Weight (empty) – lbs/Kg105 / 48105 / 48
Pressure vessel water content – USG/Liters0.5/1.90.5/1.9
Max boiler flow rate – USgpm1111
Min boiler flow rate – USgpm33
Max operating pressure – Space Heating Coil – psig43.543.5
Max operating pressure – Domestic Hot Water Coil – psig150150
Approved installation altitude – ASL10,000 ft10,000 ft
Ambient temperature – Low (°F/°C)32/032/0
Ambient temperature – High (°F/°C)122/50122/50
Max relative humidity (non-condensing)90%90%
Min water temperature – Space Heating (°F/°C)50/1050/10
Max water temperature – Space Heating (°F/°C)194/90194/90
Min water temperature – Domestic Hot Water (°F/°C)104/40104/40
Max water temperature – Domestic Hot Water (°F/°C)149/65149/65
Min flow rate to activate DHW heating – USgpm0.50.5
Max flow rate DHW heating – USgpm44
Max equivalent vent length 2″ (each side)35′35′
Max equivalent vent length 3″ (each side)120′120′
Domestic Hot Water delivery: @70°F/ 39°C temperature rise3.2 GPM

3.2 GPM


EXHAUST PIPE SIZEMAXIMUM EQUIVALENT VENT LENGTH
Schedule 40; CPVC or PPs(each side)
2”35’
3”120’
2” or 3” 90° Long sweep vent elbowAllow 5’ equivalent feet
2” or 3” 90° Short sweep vent elbowAllow 8’ equivalent feet
2” or 3” 45° Vent elbowAllow 3’ equivalent feet
PPs 
PPs 87-90’ElbowAllow 8’ equivalent feet
Flexible PPs 
3” Flexible35 Actual feet


AExhaust Outlet3″ Schedule 40
BCombustion Air3″ Schedule 40
CCold Domestic Water Connection3/4″ Male NPT
DHot Domestic Water Connection3/4″ Male NPT
EHeating Water Inlet (Return)1″ Male NPT
FHeating Water Outlet (Supply)1″ Male NPT
GGas Inlet1/2″ Male NPT
HCondensate Outlet3/4″ Hose
IKnock-out (3)1/2″

HEIGHT
DC 20-125 31.3″ [796]
DC 33-160 31.3″ [796


CONTROLLER AN INDICATOR BUTTONS
1Power IndicatorAPower – ON / OFF
2Space HeatingBSpace Heating / DHW Toggle
3Domestic Hot WaterCMinus
4Main DisplayDPlus
5Fahrenheit and PSIEFahrenheit/Celsius
6Celsius and BarFDomestic Hot Water Comfort / Eco
7Comfort / ECO / OFF – IndicatorGService
8Comfort / ECO / OFF – IndicatorHReset Button
9Service Display  
10Flashes to indicate a fault