Vanguard FM400LTM User Manual

Job __________________________

Item No ______________________

FireMax400TM Modular Water Heater

` Model: FM400N

• All pumps, sensors and controls
included

• Woven Ceramic Fiber Infrared Power
Burner.

• Radial solid copper fin-tube heat
exchanger for 3600 heat transfer

• Burners activated by water flow and
temperature.

• Advanced microprocessor controls

• Natural Gas or Liquid Propane 199,990
BTUH per burner

ACCESSORIES AND OPTIONS

(available at extra cost)

□ Factory Authorized StartUp-(highly

recommended)

FEATURES AND BENEFITS

• Single point water, gas and electrical
connections

• Factory-provided pressure and
temperature relief valve

• All waterways constructed of stainless
steel, copper and brass for corrosion
protection and clean operation

• Simple, easy maintenance through
front panel

• All stainless steel cabinet and frame

• Circulates to hot water storage tank

Printed in USA R6/05

□ Water Hammer Arrester
□ Water Pressure Gauge
□ Water Pressure/Temperature Gauge
□ Water pressure reducing valve (if water

supply pressure exceeds 80psi)

□ Low Pressure water pressure reducing

valve (for dishwasher rinse)

□ Auxiliary PowerVent required for

extended flue lengths. Call factory

□ EZ Install Kit
□ Seismic Legs

TM

or FM400L

TM

FireMax400TM – Modular Water Heater

Model: FM400NTM or FM400L

TM

Model Number

TM

FM400

Natural Gas

Pressure

WC @ Inlet

Min Max Min Max Nat LP Min Max 1" Side Top Rear

7” 10.5” 10” 14” 3.5” 7.5”

FireMax400TM/120 1 hour 840 gal 735 gal 660 gal 600 gal 552 gal 515 gal

BTU/Storage 2 hour 1560 gal 1350 gal 1200 gal 1080 gal 984 gal 910 gal

Firemax400TM/240 1 hour 960 gal 858 gal 780 gal 720 gal 672 gal 635 gal

BTU/Storage 2 hour 1680 gal 1470 gal 1320 gal 1200 gal 1104 gal 1030 gal

BtuH per burner
Natural or Propane

2 @ 199,990 1" NPT 1" NPT

LP Gas

Pressure

WC @ Inlet

Temp Rise 600F 700F 800F 900F 1000F 1100F
Output Temp 1100F 1200F 1300F 1400F 1500F 1600F

Manifold
Pressure

WC

Gas
Connection

Water

Pressure

(Flow)

40

psi

80

psi

Water
Supply

Re-circulating

Loop

To Storage Tank

Electrical
Connection

120V 1ph

12.4 amps

Clearance From

6” L
1” R

Gas Pressure
Regulators

Two Supplied 836 lbs

Combustible

Surface

Auxiliary Power

1”

6” *

Shipping
Weight

Vent Per

Local Code

Vent

Required for

extended flue

lengths Call

factory

*1” from back of exhaust vent

Note: May be vented through the dishwasher canopy or pant-leg exhaust system per 1991
Uniform Mechanical Code Sec 916. & 917. Check with local authority

Printed in USA R 5/05