Lochinvar KB-399 User Manual

KNIGHT® BOILER PRODUCT SUMMARY

(KB) 399,000 - 800,000 BTU/HR

KB-399 KB-500 KB-600 KB-700 KB-800

WATER

GALLON CAPACITY 3.4 4.2 4.2 5.0 5.7
HEATING SURFACE (SQ. FT.) 41.8 50.8 50.8 57.8 65.3
WATER CONNECTIONS 1-1/2” 1-1/2” 2" 2" 2"
DRAIN 3/4” 3/4” 3/4" 3/4" 3/4"
20°F ΔT WATER FLOW (GPM) 37 47 55 65 74
HEAD LOSS (FT. OF HD.) 21 23 31 30 33
35°F ΔT WATER FLOW (GPM) 21 26 32 37 42
HEAD LOSS (FT. OF HD.) 8 10 13 11 12
MAX. WORKING PRESSURE (PSI) 160 160 160 160 160
# OF RELIEF VALVES 11111
RELIEF VALVE SIZE 3/4” 3/4” 3/4" 3/4" 3/4"
RELIEF VALVE RATING (MBH) 697 697 697 1,352 1,352
RELIEF VALVE PRESSURE RATING (PSI) 50 50 50 50 50

GAS

INLET CONNECTION 1” 1” 1" 1" 1"
MAX. INLET PRESSURE, NAT 10.5” w.c. 10.5” w.c. 10.5” w.c. 10.5” w.c. 10.5” w.c.
MIN. INLET PRESSURE, NAT 4.0” w.c. 4.0” w.c. 4.0” w.c. 4.0” w.c. 4.0” w.c.
MAX. INLET PRESSURE, LP 13.0” w.c. 13.0” w.c. 13.0” w.c. 13.0” w.c. 13.0” w.c.
MIN. INLET PRESSURE, LP 8.0” w.c. 8.0” w.c. 8.0” w.c. 8.0” w.c. 8.0” w.c.
BTU/HR INPUT 399,000 500,000 600,000 700,000 800,000
BTU/HR OUTPUT (HIGH FIRE) 372,267 466,500 567,600 660,100 752,000
BTU/HR OUTPUT (LOW FIRE) 74,453 93,300 113,520 132,020 150,400

ELECTRICAL

VOLTAGE/HEATER 120 120 120 120 120
VOLTAGE/CONTROL 24 24 24 24 24
TOTAL AMPS 1.5 1.7 2.7 2.7 2.7
# OF ELECTRICAL CONNECTIONS 11111

DIMENSIONS

HEIGHT 42-1/2” 42-1/2” 42-1/2" 42-1/2” 42-1/2”
WIDTH 15-1/2” 15-1/2” 15-1/2" 15-1/2" 15-1/2"
DEPTH 27” 31-1/4” 36-1/4" 40-1/4" 45-1/4"

SERVICE CLEARANCES

FRONT 24” 24” 24” 24” 24”
BACK 14” 14” 14” 14” 14”
RIGHT SIDE 0” 0” 0” 0” 0”
LEFT SIDE (PIPING) 24” 24” 24” 24” 24”
TOP 24” 24” 24” 24” 24”

DIRECT VENTING

SIZE 4” 4” 4" 6" 6"
VENT CATEGORY IV IV IV IV IV
VENT MATERIAL PVC PVC PVC PVC PVC

Lochinvar Corporation • 300 Maddox Simpson Pkwy • Lebanon, TN 37090 • 615-889-8900 / Fax: [phone]

KBX-PS-03 (Replaces KBX-PS-02 06/08)

www.Lochinvar.com

06/08-Printed in U.S.A.