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Lochinvar FTXL Series Fire Tube Boiler

399,000 to 999,000 BTU/h

WATER

Specification FTX400 FTX500 FTX600 FTX725 FTX850 FTX1000
CAPACITY (GALLONS) 13 12 12 17 16 19
HEATING SURFACE (SQ FT) 55.31 73.02 73.02 84.60 99.88 119.47
WATER INLET CONNECTION 2" NPT Fitting 2" NPT Fitting 2" NPT Fitting 2.5" NPT Fitting 2.5" NPT Fitting 2.5" NPT Fitting
WATER OUTLET CONNECTION 2" NPT Fitting 2" NPT Fitting 2" NPT Fitting 2.5" NPT Fitting 2.5" NPT Fitting 2.5" NPT Fitting
DRAIN 1" NPT 1" NPT 1" NPT 1" NPT 1" NPT 1" NPT
MAXIMUM FLOW RATE 105 105 105 150 150 150
MINIMUM FLOW RATE 10 15 15 20 25 30
WATER FLOW 20 °F DELTA T (GPM) 39 49 59 71 83 98
PRESSURE DROP (FT. COL.) 3.5 4.8 4.9 3.0 5.7 4.5
WATER FLOW 20 °F DELTA T (GPM) 20 24 29 35 41 49
PRESSURE DROP (FT. COL.) 2.5 2.9 2.8 3.0 3.3 3.8
MAX. SERVICE PRESSURE (PSI) 160 160 160 160 160 160
NUMBER OF PRESSURE RELIEF VALVES 1 1 1 1 1 1
PRESSURE RELIEF VALVE SIZE 3/4" 3/4" 3/4" 3/4" 3/4" 3/4"
PRESSURE RELIEF VALVE: NOMINAL SETTING (MBH) 697 697 697 1,352 1,352 1,352
PRESSURE RELIEF VALVE: SETTING (PSI) 50 50 50 50 50 50

GAS

Specification FTX400 FTX500 FTX600 FTX725 FTX850 FTX1000
BTU/H INPUT 399,000 500,000 600,000 725,000 850,000 999,000
BTU/H OUTPUT (HIGH FIRE) 391,000 489,000 585,000 705,000 825,000 982,000
BTU/H OUTPUT (LOW FIRE) 39,100 48,900 83,571 100,714 117,857 98,200
BOILER INPUT (HP) 11.9 14.9 17.9 21.7 25.4 29.8
INLET CONNECTION 1" 1" 1" 1" 1" 1 1/4"
MAX. INLET PRESSURE, NAT. (in. w.c.) 14 14 14 14 14 14
MIN. INLET PRESSURE, NAT. (in. w.c.) 4 5 4 4 4 4
MAX. INLET PRESSURE, PROP. (in. w.c.) 14 14 14 14 14 14
MIN. INLET PRESSURE, PROP. (in. w.c.) 8 8 8 8 8 8

ELECTRICAL

Specification FTX400 FTX500 FTX600 FTX725 FTX850 FTX1000
VOLTAGE/HEATING (VAC) 120 120 120 120 120 120
VOLTAGE/CONTROL (VAC) 24 24 24 24 24 24
AMP 4 5 6 7 6 7
# OF ELECTRICAL CONNECTIONS 1 1 1 1 1 1

DIMENSIONS

Specification FTX400 FTX500 FTX600 FTX725 FTX850 FTX1000
HEIGHT 53 1/4" 53 1/4" 53 1/4" 53 1/4" 53 1/4" 61 1/4"
WIDTH 26 1/4" 26 1/4" 26 1/4" 26 1/4" 26 1/4" 26 1/4"
DEPTH 23 1/2" 23 1/2" 23 1/2" 23 1/2" 23 1/2" 26 1/4"
SHIPPING WEIGHT (lb) 478 504 504 575 604 670
OPERATING WEIGHT (lb) 542 560 560 672 693 750

MAINTENANCE CLEARANCES (RECOMMENDED)

Clearance FTX400 FTX500 FTX600 FTX725 FTX850 FTX1000
FRONT 30" 30" 30" 30" 30" 30"
REAR 24" 24" 24" 24" 24" 24"
RIGHT SIDE 0" 0" 0" 0" 0" 0"
LEFT SIDE 0" 0" 0" 0" 0" 0"
TOP 18" 18" 18" 18" 18" 18"

DIRECT VENT

Specification FTX400 FTX500 FTX600 FTX725 FTX850 FTX1000
VENT DIA. 4" 4" 4" 6" 6" 6"
AIR INLET DIAMETER 4" 4" 4" 4" 4" 6"
VENT CATEGORY IV IV IV IV IV IV
VENT PIPE MATERIAL PVC/CPVC/PP/AL29-4C PVC/CPVC/PP/AL29-4C PVC/CPVC/PP/AL29-4C PVC/CPVC/PP/AL29-4C PVC/CPVC/PP/AL29-4C PVC/CPVC/PP/AL29-4C

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