A.O. Smith TC-099 - Manual (Page 71)

VF BOILER SERVICE MANUAL
AOS WPC - Tech Training 70 of 72 Ashland City, TN © 2007
Servicing should only be performed by a Qualified Service Agent
TECHNICAL SPECIFICATIONS
Ignition Timing:
Default User Settings/Ranges:
As shipped from the factory the SW1 dip switches (page 30) on the MCB are preset to the
appropriate values according to the system that was ordered, either VW or VB. The user
settings are also preset to the following default values:
Pre-Purge - cold start 32 ± 2 seconds
Pre-Purge – not cold start 10 ± 2 seconds
Shutter Adjust 5 minutes
Pre-Circulate 34 to 45 seconds or until flow is proven
Igniter proving time 18 ± 1 seconds
Inter-Purge 15 ± 2 seconds
Post-Purge 25 ± 2 seconds
Pump post-circulate time Selectable 45, 90, 180 seconds or continuous
VW MODELS DEFAULT SETTING ADJUSTABLE RANGE
Oper Setpnt (Operating Setpoint) 145° F (63° C) 70ºF to 190ºF
Stage1 Diff (Operating Setpoint Differential) 3° F (2° C) 1° to 50°F
Hi Limit (Automatic High Limit Setpoint) 210° F (99° C) 90ºF to 210ºF
Hi Limit Dif (Automatic High Limit Differential) 20° F (11° C) 1° to 50°F
VB MODELS DEFAULT SETTING ADJUSTABLE RANGE
Oper Setpnt (Operating Setpoint) 190° F (88° C) 70ºF to 220ºF
Stage1 Diff (Operating Setpoint Differential) 3° F (2° C) 1° to 50°F
Hi Limit (Automatic High Limit Setpoint) 230° F (110° C) 90ºF to 235ºF
Hi Limit Dif (Automatic High Limit Differential) 20° F (11° C) 1° to 50°F
BOTH MODELS DEFAULT SETTING ADJUSTABLE RANGE
Tempert Units (Temperature Units) °F °F or °C
Post Cir Secs (Post Circulation pump delay) 45 seconds 45, 90, 180, Continuous
Netwrk Address (Network Address) 0 non-valid address 0 or 1 to 31 valid address