Lochinvar EB-EWU-02 - Manual (Page 4)

The combustion air supply must be completely free of any
chemical fumes which may be corrosive to the appliance.
Common chemical fumes which must be avoided are
fluorocarbons and other halogenated compounds, most
commonly present as refrigerants or solvents, such as
Freon, trichlorethylene, perchlorethylene, chlorine, etc.
These chemicals, when burned form acids which quickly
attack the heat exchanger finned tubes, tube headers, flue
collectors, and the vent system. The result is improper
combustion and a non-warrantable, premature appliance
failure.
EXHAUST FANS: Any fan or equipment which exhausts
air from the mechanical room may deplete the combustion
air supply and/or cause a down draft in the venting system.
Spillage of flue products from the venting system into an
occupied living space can cause a very hazardous condition
that must be immediately corrected. If a fan is used to
supply combustion air to the boiler room, the installer must
make sure that it does not cause drafts which could lead to
nuisance operational problems with the appliance.
FIG. 3 Ignition Module
The unit has a lighted ON/OFF power switch on the outer
cabinet (left side) and five (5) LED indicators on the
electronic ignition control module to monitor the units
operation.
Listed below are items that must be checked to ensure safe
reliable operations. Verify proper operation after servicing.
1. Examine the venting system at least once a year. Check
more often in first year to determine inspection interval.
Check all joints and pipe connections for tightness,
corrosion or deterioration. Clean screens in the venting
air intake system as required. Have the entire system,
including the venting system, periodically inspected by
a qualified service agency.
4
OPERATION AND
DIAGNOSTIC LIGHTS
TABLE - A
IGNITION MODULE
INDICATING LIGHTS
Indicating Light
Power on Switch
Power LED
Purge LED
Ignitor LED
Valve LED
Flame LED
Function
- On - 120 VAC supplied to unit
- On - Module is powered from 24
VAC system and operating
properly
- Blinks continuously if voltage is
too high on transformer secondary
- Off - Module is not powered
- Off - Combustion air fan is not
powered OR air flow is not proven
- On - When unit is in prepurge or
interpurge
- Blinks continuously when there is
a pressure switch fault
- Off - Igniter is off
- On - When hot surface igniter is on
- Off - Gas valve is closed
- On - Control signaling gas valve
is on
- Blinks continuously when control
is in LOCKOUT because it failed
ignition
- Off - Flame is not present
- On - Control signaling flame is
present
- Blinks continuously when L1 and
neutral are reversed
MAINTENANCE
ƽ ƽ CAUTION
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation.