Argo AT0623 User Manual

15
SEQUENCE OF OPERATION
Boiler Display Codes
Display Description Range Note
On Boiler in On mode
Off Boiler in Off mode
CHS
Comfort Heating Setting 90-180°F (32-82°C) Control prevents setting from being higher than
Domestic Hot Water Setting
dHS
Domestic Hot Water Setting 90-180°F (32-82°C) Control prevents setting from being lower than
Comfort Heating Setting
dFS Differential Setting 4-20°F (2-11°C) Applies to CHS & dHS
DEG Degrees Temperature scale F or C
Stg Heating Element Stages 2 or 4
EL Active Elements 1-2 or 3-4 Only available if Stg is 2
dFt Dry Fire Test Displayed when power initially applied
LdC
Load Management Displayed when LMC terminals open De-activates heating elements. Diverts TT to
TTAux for secondary appliance.
F Degrees Fahrenheit
C Degrees Centigrade
1-2 Elements 1 & 2 Active Two element boiler only
3-4 Elements 3 & 4 Active Two element boiler only
Display Failure Alarm Boiler state Action Required
r1 Element-1 relay failure Audible Alarm ON Check all circuit breakers. Reset power
by cycling pump circuit breaker (15A) or
pressing and holding MODE/PWR button for 2
seconds. Call for service if problem persists.
r2 Element-2 relay failure Audible Alarm ON
r3 Element-3 relay failure Audible Alarm ON
r4 Element-4 relay failure Audible Alarm ON
dFF
Dry Fire Failure Audible
Alarm after 3
attempts
ON Correct fault, reset power
tSO Temperature sensor open Audible Alarm ON Replace temperature sensor
tSS Temperature sensor shorted Audible Alarm ON
AbP
Abnormal Power Audible Alarm Control voltage outside
the range of 18-30Vac
Verify all circuit breakers are on. Call for
service if problem persists
FLO
Flow Switch Open Audible Alarm Flow switch open
(Installer item)
Check water ow
LCO
Low Water Cutoff Open Audible Alarm Low Water Cutoff open
(Installer item)
Check water level
HL High limit(s) Audible Alarm High Limit(s) Open Reset power, Call for service
CHF
Control Hardware Audible Alarm Control Hardware
Failure
Call For Service
FP
Freeze Protection No Audible
Alarm
Water temperature
below 45°F (27°C)
Control energizes pump and heating mode
until WT reaches 55°F.
Fault Codes

Argo AT0623 Specifications

General

Brand	Argo
Model	AT0623
Category	Boiler
Language	English