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

SCAQMD 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

272 Duchaine Blvd, New Bedford, MA 02745 • LP-250 • www.htproducts.com • 03 / 2018 © HTPIn accordance with our company policy of ongoing product improvement, HTP Inc. reserves the right to make changes without prior notice. • Preliminary product specifications

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

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