Crown Boiler TWZ150 Instruction Manual

TWZ/CT/ODV Series Oil-Fired Hot Water Boilers (Less Tankless Heater)INSTALLATION SUPPLEMENT FOR BOILERS EQUIPPED WITH HONEYWELL L7248L“2012 COMPLIANT”

81sec.1sec. 1sec. FIGURE 12.3: TYPICAL OPERATING MODE DISPLAY (BOILER TEMP SHOWN)TABLE 12.2: STATUS CODESStatus # Description Meaning1S

9TABLE 12.5: ADJUSTMENT MODE PARAMETERSStatus # DescriptionFactory Setting Permissible Range HLHigh Limit Set point 180F 140-220FHdFHigh Limit Differe

10HdF (High limit differential) - If the boiler shuts off on high limit, the water temperature must fall by an amount equal to the differential during

11TABLE 12.7 SUMMARY OF CIRCULATOR BEHAVIOR Thermostat Inputs Use of “ZC” ZoneParameters Circulator OutputsT-T “DHW”2nd Zone (Zc)DHW Priority (Pt) “C

12XIV Trouble Shooting The following tables contain trouble shooting tables for use in diagnosing control problems. When using these tables the fol

13TABLE 14.1 - FAULTS WITHOUT ERROR CODE PRESENTDisplayed Codes Problem Possible CauseStA 1hr OFFdh OFFBurner and Circulator OffThermostat/s not calli

PN: 980200 08/12Manufacturer of Hydronic Heating ProductsP.O. Box 14818 3633 I. StreetPhiladelphia, PA 19134www.crownboiler.com

1I Basic InformationA. What is this Supplement For? This instruction manual supplement provides important information on the installation and oper

2120 Volt Wiring1) - The boiler should be provided with its own 15A branch circuit with fused disconnect. 120VAC power con-nections are made inside

3 FIGURE 10.0: TWZ, CT BOILERS: CONNECTIONS DIAGRAM FOR L7248L AQUASTAT®

4 FIGURE 10.1: TWZ, CT BOILERS: CONNECTIONS DIAGRAM FOR BURNER PRIMARY CONTROLS Carlin 40200: Beckett 7505: Riello 530SE:

5 FIGURE 10.2: ODV BOILERS: CONNECTIONS DIAGRAM FOR L7248L AQUASTAT®

6XII OperationA. General Information This boiler uses a proprietary version of the Honeywell L7248L Aquastat® to regulate water temperature and to m

7STATUSMODE:6W$=CurrentStatus(Table12.2)PressandHoldI,↑,and↓foratleast3sectoenterADJUSTMENTMODEPressItoenterOPERATINGMODEEW=