Instruction manual

ManualsBrandsCrown Boiler ManualsBoilerTWZ150

TWZ/CT/ODV Series

Oil-Fired Hot Water Boilers (Less Tankless Heater)

INSTALLATION SUPPLEMENT FOR BOILERS

EQUIPPED WITH HONEYWELL L7248L

“2012 COMPLIANT” BOILER CONTROL

These instructions must be afxed on or adjacent to the boiler

WARNING: Improper installation,

adjustment, alteration, service or

maintenance can cause property

damage, injury, or loss of life.

For assistance or additional

information, consult a qualied

installer, service agency or the oil

supplier. Read these instructions

carefully before installing.

D ESIGNED TO L EAD

Manufacturer of Hydronic Heating Products

P.O. Box 14818 3633 I. Street

Philadelphia, PA 19134

www.crownboiler.com

Summary of content (16 pages)

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D E S I G N E D T O L E A D TWZ/CT/ODV Series Oil-Fired Hot Water Boilers (Less Tankless Heater) Installation Supplement for boilers equippEd with honeywell L7248L “2012 Compliant” boiler control These instructions must be affixed on or adjacent to the boiler Warning: Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury, or loss of life. For assistance or additional information, consult a qualified installer, service agency or the oil supplier.
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I Basic Information A. What is this Supplement For? This instruction manual supplement provides important information on the installation and operation of TWZ, CT and ODV boilers equipped with a proprietary version of the Honeywell L7248L Aquastat®. This control is being used in order to comply with the 2007 Energy Independence and Security Act (EISA).
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1) 120 Volt Wiring - The boiler should be provided with its own 15A branch circuit with fused disconnect. 120VAC power connections are made inside the L7248L as follows (also see Figures. 10.0 or 10.2 as appropriate for boiler model): • • • Hot (“black”) - Terminal “L1” Neutral (“white”) - Terminal “L2” Ground (“green” or bare) - Ground screw on case of L7248L.
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FIGURE 10.
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Riello 530SE: Beckett 7505: Carlin 40200: FIGURE 10.
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FIGURE 10.
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XII Operation A. General Information This boiler uses a proprietary version of the Honeywell L7248L Aquastat® to regulate water temperature and to manage demands from up to two circulator zones. Crown offers a low water cut-off kit that may be used with this control (PN 411000). Specific information on this kit, along with installation and operating instructions, are available through Crown distributors and at www.crownboiler.com.
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FIGURE 12.1: BOILER CONTROL MENU STATUS MODE: 6W$=Current Status (Table 12.2) Press and Hold I, ↑, and ↓ for at least 3 sec to enter ADJUSTMENT MODE Press I to enter OPERATING MODE +/= High Limit Setting EW= Current Boiler Temp.
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Status # TABLE 12.2: STATUS CODES Meaning Description 1 Standby 8 Burner Demand No call for heat or DHW OR Call for heat present , but boiler is in thermal purge (See PP on page 11) OR Call for heat/DHW present but boiler temperature is above set point (SP) setting. The burner is running OR The burner is off due to an open limit (such as an external high limit or LWCO) OR The burner is being prevented from firing by its primary control.
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TABLE 12.5: ADJUSTMENT MODE PARAMETERS Factory Status # Description Setting Permissible Range High Limit Set point 180F 140-220F HL High Limit Differential 15F 10-30F HdF ZC ZC and ZR Terminal Function dh dh (DHW) OR Zr (2nd Heating Zone) OR ELL (“External Low Limit” NOT RECOMMENDED) Or PP Circulator overrun 0 min 0-10 minutes Thermal Purge time 2 min 2-20 minutes St Thermal Purge Start Temp 140F 140-180F Pt DHW Priority ON ON or OFF F-C Temperature Units F F or C bAc Exit Adj.
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HdF (High limit differential) - If the boiler shuts off on high limit, the water temperature must fall by an amount equal to the differential during the same call for heat before the burner will again start. For example, with HL=180 and HdF=15, the burner will shut off if the water temperature exceeds 180F and stay off until the temperature falls to 165F (180 - 15).
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Or (Circulator Overrun) - Determines how long the Heating Circulator will operate after the call for heat ends. In some cases, this can help reduce energy consumption by sending heat stored in the boiler out into the system. At the same time, caution should be exercised before setting this value to something other than zero. Before doing so, verify that the system will permit flow (e.g. flow is not completely cut-off by closed zone valves) and that the overrun will not cause overheating problems.
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XIV Trouble Shooting The following tables contain trouble shooting tables for use in diagnosing control problems. When using these tables the following should be kept in mind: 1) This information is only meant to be used by a professional heating technician as an aid in diagnosing boiler problems. 2) Where applicable, follow all precautions outlined in the Start-up and Checkout Section of the boiler installation manual.
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TABLE 14.1 - FAULTS WITHOUT ERROR CODE PRESENT Displayed Codes Problem Possible Cause Burner and Circulator Off • • • • Thermostat/s not calling for heat Loose connection in thermostat, zone valve end switch, or zone panel wiring. Thermostat, zone valve, or zone panel miswired Defective thermostat, zone valve, or zone panel StA 1 hr On Burner Off Circulator On Boiler Warm • • Boiler off on high limit (normal operation) Boiler off on thermal purge (normal operation - See Table 12.
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Manufacturer of Hydronic Heating Products P.O. Box 14818 3633 I. Street Philadelphia, PA 19134 www.crownboiler.