39
IOM, XT Models
Enertech Global
Lockout with Emergency Heat
While in lockout mode, if the thermostat is calling for
backup heat, emergency heat mode will occur.
Diagnostics
The lockout board includes five LEDs (status, high
pressure, low pressure, low water flow, condensate
overflow) for fast and simple control board
diagnosis. Below is a table showing LED function.
Section 9: Controls
LED Color
Location
1
Function
Normal Operation
Fault Retry
2
Lockout
2
Green
Top
High Pressure
OFF
Flashing
3
ON
3
Orange
2nd
Low Pressure
OFF
Flashing
3
ON
3
Red
3rd
Water Flow
OFF
Flashing
3
ON
3
Yellow
4th
Condensate
Overflow
OFF
Flashing
3
ON
3
Green
Bottom
Status
Flashing
4
Flashing
5
Flashing
4
Notes:
1. Looking at the board when the LEDs are on the right hand side.
2. If all five lights are flashing, the fault is over/under voltage.
3. Only the light associated with the particular fault/lockout will be on or flashing.
For example, if a high pressure lockout has occurred, the top green light will be on.
The orange, red, and yellow lights will be off.
4. Status lights will be off when in test mode.
5. Flashes alternately with the fault LED.
Lockout Board LED Identification
Hot Water Pump Control
Controls for high water temperature and low
compressor discharge line temperature prevent the
hot water (desuperheater) pump from operating
when the leaving water temperature is above 130°F,
or when the compressor discharge line is too cool to
provide adequate water heating.
Lockout Board Jumper Selection
The lockout board includes three jumpers for field
selection of various board features.
Water Solenoid Valve Delay (WSD): When the WSD
jumper is installed, the “A” terminal is energized 10
seconds before the compressor is energized. When
the jumper is removed, the “A” terminal is energized
with the compressor. If using a water solenoid valve
without an end switch, connect to terminal “A”. If
using a water solenoid valve with an end switch,
connect to terminals YT and YU(remove the jumper
wire).
Refer to wiring diagram. Enertech recommends the
use of a slow acting valve to reduce the chance of
water hammer.
Test Mode (TEST): When the TEST jumper is installed,
the board operates in the normal mode.
When the jumper is removed, the board operates
in test mode, which speeds up all delays for easier
troubleshooting. When service is complete, the
jumper must be re-installed in order to make sure
that the unit operates with normal sequencing
delays. While the test jumper is removed, the status
light (bottom green) will remain off.
Over/Under Voltage Disable (O/V): When the
O/V jumper is installed, the over/under voltage
feature is active. When the jumper is removed, the
over/under voltage feature is disabled. On rare
occasions, variations in voltage will be outside the
range of the over/under voltage feature, which may
require removal of the jumper. However, removal
of the jumper could cause the unit to run under
adverse conditions, and therefore should not be
removed without contacting technical services.
An over/under voltage condition could cause
premature component failure or damage to the
unit controls. Any condition that would cause this
fault must be thoroughly investigated before taking
any action regarding the jumper removal. Likely
causes of an over/under voltage condition include
power company transformer selection, insufficient
entrance wire sizing, defective breaker panel,
incorrect transformer tap (unit control box), or other
power-related issues.