Advanced Heating & Hot Water Systems
U P TO 850,000 B T U H O F H E AT I N G P O W E R
A BRAND OFSCAQMD Rule 1146.2
Heat Exchanger Bears the ASME
“H” Stamp
• Up to 5:1 Turndown Ratio
• Whisper Quiet Operation
• Low NOx Operation
• High Grade Inconel Burner
• Cascade up to 8 Boilers
• ASME Approved
Stainless Steel - Commercial Boiler
An Intelligent Design that Delivers Highly Efficient Hydronic Heating with up to 98% Thermal Efficiency
Stainless SteelHeat Exchanger
Outlet Nipple
Inlet Nipple
CombustionBlower
GasValve
Pressure Relief Valve
CondensateCollection
System
Manual ResetHigh Limit
Control
AdjustableLeveling Feet
Eco High Limit
Low Water Sensor
Construction Features Look Inside
Optional Equipment
Additional Features
Combustion System• Up to 98% Thermal Efficienc y• Modulating Burner with up to 5 : 1 Turndown Ratio• Whisper Quiet Operation• Low NOx Operation• High Grade Inconel Burner• Reliable Spark Ignition• Gas Valve (Tested to UL, FM, CSA Standards)
Heat Exchanger• All Stainless Steel Construction• No Gaskets, Welded Construction. ASME Approved• 150 PSI Relief Rated• Easy to Ser vice
Integrated Control System• Built-in sequencer for up to 8 boilers• Digital display - Total System Control• Integrated Control allows only the amount of heated energy required.• Outdoor sensing with Indirect priority, allows for greater energy savings and comfor t • Built in Low water cut off with additional manual reset high limit switch• Multiple Pump outputs – Boiler Pump – System Pump – Indirect Pump 24 volt monitor for system safeties• Dual flame sensing (Flame probe / Spark Ignition Probe)
• Superior Condensate Collection System Easy to service with overflow protection• PVC – CPVC – Stainless Steel Venting• Vents up 200 feet combined• Double Stack units for double the output in small foot print• Adjustable Legs• Direct Vent Sealed Combustion• Models available for Natural or LP Gas• Easy access to wiring and field service of combustion heat exchanger• Zero clearance to combustibles• Low water cutoff standard equipment• High limit manual reset• Removable front cover allows easy access to burner assembly • Zero clearance to all combustible surfaces.• Factory installed AGA/ASME rated relief valve.• PC monitoring for history – system operation (optional)• Self diagnostic electronic control with digital readout to monitor system parameters.
• System Sensor (Part # 7250P-324)• Indirect Sensor (Part # 7250P-325)• 4” Stainless Steel Outside Termination Vent Kit (V2000)• 6” Stainless Steel Outside Termination Vent Kit (V3000)• High and Low Gas Pressure Switch Kit with Manual Reset (Part # 7350P-600)• U.L. 353 Compliant Low Water Cut-Off Interface Kit with Manual Reset (Part # 7350P-601)• Alarm System (Part # 7350P-602) (to monitor any failure)• Stacking Kit (Part # 7350P-603)• PC Interface Cable (Part # 7250P-320)• Boiler Caster Kit (Part # 7350P-604)• Mod Con Condensate Neutralizer (Part # 7350P-611)• Flow Switch Kit (Part #7350P-605 Mod Con 500/700/850)
Notes:1. This drawing is meant to show system piping
concept only.2. An Anti-Scald mixing valve is recommended if
the DHW temperature is set above the factory setting of 119°F.
3. Install a minimum of 12 diameters of straight pipe upstream of all circulators.
4. Piping shown is Primary/Secondary5. System Flow (Secondary Loop) must be greater
than the boiler’s primary loop flow.
Single Boiler Space Heating with Indirect Priority
Stainless Steel - Commercial Boiler
Model 500 700 850Installation Indoor, Floor Standing, Fully Condensing
Minimum / Maximum Input (Btu/Hr) 100,000 / 500,000 170,000 / 700,000 170,000 / 850,000
Thermal Efficiency 94% 98% 94%
Heating Capacity (MBH) 470 686 799
Flue System Category IV, Sealed Combustion Direct Vent, Power Vent
Minimum Combined Vent Run 16 feet
Maximum Combined Vent Run 4” (200 feet) 6” (200 feet)
Approved Exhaust Vent Materials PVC, CPVC, PP, Stainless Steel
Shipping Weight (lbs) 505 580
Gas Supply PressureNG
3.5” to 14” WCLP
Manifold Pressure Min / Max NG/LP: -0.01” WC
Power Supply 120V 60 Hz, 6.3A
General Operating Conditions Ambient Temperature Range: 33 – 104oF (0.6 – 40oC)Product Approvals and Requirements: ANSI Z21.13 / CSA 4.9
Ignition System Direct Electronic Spark Ignition / Flame Rectification
Burner System Premixed Fuel Modulation / Stainless Steel Metal Fiber Burner
Gas Valve System Air Ratio Valve
Dimensions(in Inches)
W 20.5
H 36
D 46 68.5
Boiler Water Content (Gallons) 4.2 5.8
Minimum Flow Rate @ 30oF ∆T (GPM) 33 54
Boiler Setpoint Temperature Range 50 – 190oF / 32 - 190oF (with Outdoor Reset Curve)
DHW Indirect Setpoint Temperature Range 70 – 185oF
Water Pressure (PSI)Heat Exchanger MAWP 160
Pressure Relief Valve 75
Control Panel / Main Controller LCD Display with LED Indicators / 926 Digital Control
Connection SizesSupply / Return 2” NPT
Gas Inlet 1 1/2” NPTF 2” NPTF
MaterialsCabinet Powder Coated Galvaneal Steel
Heat Exchanger 316L Stainless Steel Water Tube
Safety DevicesFlame Rectifier Probe, Water Temperature High Limit Switch (190oF), Freeze Protection,
Condensate Trap with Overflow Switch, Included LWCO (Optional UL 353 LWCO), Blocked Vent Pressure Switch, Optional Gas High/Low Pressure Switch
www.htproducts.com • 272 Duchaine Blvd, New Bedford, MA • © Ariston Thermo USA LLC. 07/30/2020 • MKTLIT-105In accordance with our company policy of ongoing product improvement, HTP reserves the right to make changes without prior notice. • Preliminary product specifications
Model A B C D E F G H J K L M N OMOD CON 500 20” 14.75” 6.25” 13.25” 14.50” 33.25” 5.25” 20.5” 36” 43.75” 46” 48” 8.25” 25.5”MOD CON 700 20” 20” 6.25” 16.25” 18.75” 43.50” 20” 20.5” 36” 62.25” 68.5” 73” 8.25” 25.5”MOD CON 850 20” 20” 6.25” 16.25” 18.75” 43.50” 20” 20.5” 36” 62.25” 68.5” 73” 8.25” 25.5”
O
N
Display PanelPowerSwitch
H
J
MODE BA C D E F G H J K L M N O P
MOD CON 500 VWH 14-3/4"20"
MOD CON 700 VWH20" 20" 20"
6-1/4" 13-1/4"
6-1/4" 16-1/4"
14 -1/2"
18-3/4"
33-1/4" 5-1/8"
36"
36"
100,000 - 500,000
170,000 - 700,000
170,000 - 850,000
470,000 409,000
572,600
695,000
98%
98%
97%
4.2 Gal. 2”
2”
2”
1- 1/2”
2”
2”
4”
6”
6”
505lbs.
580lbs.
580lbs.
7200
5700
6800
1950
2200
2200
3000
3000
3000
5.8 Gal.
5.8 Gal.
686,000
799,000
62-1/4"
43-3/4"
68-1/2 "
46"
73"
48"
8-1/4"
8-1/4"
25-1/2"
25-1/2"
10-1/2"
10-1/2"
20-1/2"
20-1/2"
43-1/2"MOD CON 850 VWH
MOD CON 500 VWH
MOD CON 700 VWH
MOD CON 850 VWH
NOTE: ALL DIMENSIONS ARE APPROXIMATE AND HEIGHTS DO NOT INCLUDE ADJUSTABLE LEGS.
Front Right Side
Left Side Rear
(All Models)
MODELBtuhInputRange
Gross Output
BtuhNet I=B=R
BtuhThermal
E�eciencyBoiler Water
Supply/ReturnConnection
Gas Conn.
VentDia.
Ship.Wt.
High Fan
Speed
Low Fan
SpeedFan Speed at Ignition
Exhaust
Air Intake
P
Cold WaterInlet
Discharge
Access Panel(Control Board) Access Panel
(Electrical)
Hot Water Outlet
CondensateGas Line
F
A
C
B
DE
G
LM
K
O
N
Display PanelPowerSwitch
H
J
MODE BA C D E F G H J K L M N O P
MOD CON 500 VWH 14-3/4"20"
MOD CON 700 VWH20" 20" 20"
6-1/4" 13-1/4"
6-1/4" 16-1/4"
14 -1/2"
18-3/4"
33-1/4" 5-1/8"
36"
36"
100,000 - 500,000
170,000 - 700,000
170,000 - 850,000
470,000 409,000
572,600
695,000
98%
98%
97%
4.2 Gal. 2”
2”
2”
1- 1/2”
2”
2”
4”
6”
6”
505lbs.
580lbs.
580lbs.
7200
5700
6800
1950
2200
2200
3000
3000
3000
5.8 Gal.
5.8 Gal.
686,000
799,000
62-1/4"
43-3/4"
68-1/2 "
46"
73"
48"
8-1/4"
8-1/4"
25-1/2"
25-1/2"
10-1/2"
10-1/2"
20-1/2"
20-1/2"
43-1/2"MOD CON 850 VWH
MOD CON 500 VWH
MOD CON 700 VWH
MOD CON 850 VWH
NOTE: ALL DIMENSIONS ARE APPROXIMATE AND HEIGHTS DO NOT INCLUDE ADJUSTABLE LEGS.
Front Right Side
Left Side Rear
(All Models)
MODELBtuhInputRange
Gross Output
BtuhNet I=B=R
BtuhThermal
E�eciencyBoiler Water
Supply/ReturnConnection
Gas Conn.
VentDia.
Ship.Wt.
High Fan
Speed
Low Fan
SpeedFan Speed at Ignition
Exhaust
Air Intake
P
Cold WaterInlet
Discharge
Access Panel(Control Board) Access Panel
(Electrical)
Hot Water Outlet
CondensateGas Line
F
A
C
B
DE
G
LM
K
O
N
Display PanelPowerSwitch
H
J
MODE BA C D E F G H J K L M N O P
MOD CON 500 VWH 14-3/4"20"
MOD CON 700 VWH20" 20" 20"
6-1/4" 13-1/4"
6-1/4" 16-1/4"
14 -1/2"
18-3/4"
33-1/4" 5-1/8"
36"
36"
100,000 - 500,000
170,000 - 700,000
170,000 - 850,000
470,000 409,000
572,600
695,000
98%
98%
97%
4.2 Gal. 2”
2”
2”
1- 1/2”
2”
2”
4”
6”
6”
505lbs.
580lbs.
580lbs.
7200
5700
6800
1950
2200
2200
3000
3000
3000
5.8 Gal.
5.8 Gal.
686,000
799,000
62-1/4"
43-3/4"
68-1/2 "
46"
73"
48"
8-1/4"
8-1/4"
25-1/2"
25-1/2"
10-1/2"
10-1/2"
20-1/2"
20-1/2"
43-1/2"MOD CON 850 VWH
MOD CON 500 VWH
MOD CON 700 VWH
MOD CON 850 VWH
NOTE: ALL DIMENSIONS ARE APPROXIMATE AND HEIGHTS DO NOT INCLUDE ADJUSTABLE LEGS.
Front Right Side
Left Side Rear
(All Models)
MODELBtuhInputRange
Gross Output
BtuhNet I=B=R
BtuhThermal
E�eciencyBoiler Water
Supply/ReturnConnection
Gas Conn.
VentDia.
Ship.Wt.
High Fan
Speed
Low Fan
SpeedFan Speed at Ignition
Exhaust
Air Intake
P
Cold WaterInlet
Discharge
Access Panel(Control Board) Access Panel
(Electrical)
Hot Water Outlet
CondensateGas Line
F
A
C
B
DE
G
LM
K