Operation - Lochinvar 399 Installation And Service Manual

Remote On/Off
HeatDem1
STAGE 1 STAGE 2
1C 1NO 2C
CONTINUOUS
A1 A2
REMOTE ON/OFF BOILER OR WATER HEATER
Priority or O.A.
Lockout Override
Remote On/Off
(Optional)
HeatDem1
STAGE 1 STAGE 2
1C 1NO 2C
CONTINUOUS
A1 A2
BOILER WITH DOMESTIC HOT WATER PRIORITY OR I/O RESET OVERRIDE
STAGE 2
STAGE 1
HeatDem1
STAGE 1 STAGE 2
1C 1NO 2C
CONTINUOUS
A1 A2
2 STAGE (High/Low Fire) BOILER OR WATER HEATER
Field Provided Jumper Wire
Required for Mode 3 Operation
Remove Factory Jumper
if Jumper Wire is Added.
HeatDem2
STAGE 3 STAGE 4
2NO 3C 3NO 4C 4NO
INTERMITTENT
A3 B1 B2 B3
Figure 42B
HeatDem2
STAGE 3 STAGE 4
2NO 3C 3NO 4C 4NO
INTERMITTENT
A3 B1 B2 B3
Figure 42C
HeatDem2
STAGE 3 STAGE 4
2NO 3C 3NO 4C 4NO
INTERMITTENT
A3 B1 B2 B3
Figure 42D
Installation and
Service Manual
STAGE 4
STAGE 3
STAGE 2
STAGE 1
HeatDem1
STAGE 1
1C 1NO
CONTINUOUS
A1
4 STAGE (High/Low Fire) BOILER OR WATER HEATER
HeatDem1
STAGE 1 STAGE 2
1C 1NO 2C
CONTINUOUS
A1 A2
OK
COM
CONTINUOUSLY
MONITORED
EXAMPLE DEVICES:
HIGH/LOW GAS, AUX. HI-LIMIT
AUX. LIMITS, EXT. FLOW SWITCH
Figure 42F
FIELD INSTALLED SAFETY DEVICES

OPERATION

FOR YOUR SAFETY READ BEFORE
OPERATING
A. This appliance does not have a pilot. It is equipped with an
ignition device which automatically lights the burner. Do
not try to light the burner by hand.
B. BEFORE OPERATING, smell around the appliance area
for gas. Be sure to smell next to the floor because some gas
is heavier than air and will settle to the floor.
41
HeatDem2
STAGE 2 STAGE 3 STAGE 4
2C 2NO 3C 3NO 4C
INTERMITTENT
A2 A3 B1 B2 B3
Figure 42E
HeatDem2
STAGE 3 STAGE 4
2NO 3C 3NO 4C 4NO
INTERMITTENT
A3 B1 B2 B3
OK
COM
FAIL FAIL
INTERMITTENTLY
MONITORED
4NO