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WARNING
!
Electrical shock hazard� Turn OFF electrical power supply
at service panel before making electrical connections�
Failure to do so could result in death or serious injury�
12.1
Electrical wiring shall conform to requirements
of authority having jurisdiction or in absence of such
requirements ANSI/NFPA No. 70 National Electrical
Code.
Electrically bond boiler to ground in accordance with
requirements of authority having jurisdiction� Refer to:
USA- National Electrical Code, ANSI/NFPA 70.
A. Electrical Service Field Wiring
120 volt power supply field wiring connects to limit control.
Provide appropriate overcurrent protection and service
disconnect switch�
B. Thermostat Installation
1.
Thermostat should be installed on inside wall about
four feet above the floor.
2.
NEVER install thermostat on outside wall�
3.
Do not install thermostat where it will be affected by:
• Drafts
• Hot or cold pipes
• Sun light
• Lighting fixtures
• Television sets
• Fireplace or chimney
4.
Check thermostat operation by raising and lowering
thermostat as required to start and stop burner�
5.
Instructions for final adjustment of thermostat
are packaged with thermostat ( adjusting heating
anticipator, calibration, ect�)�
C. Hydrostat 3250 Hi-Limit/LWCO Control
See Figure #19
Combined High Limit, Low Limit and Low Water Cutoff.
• Well mounted to front of boiler�
• Temperature probe installed in well is attached to
4-pin plug inside limit control box�
• If connecting boiler to indirect water heating system
change zone switch from Z to I on Hydrostat
controller�
• Adjust High Limit and Low Limit dials to desired
temperatures�
• See control manufacturer specific instructions for
details on operation and settings�
• See Figures #20 and #21 for wiring connections�
12 - ELECTRICAL WIRING
Figure #19 - Hydrostat 3250 Hi-Limit/Low
Water Cutoff Control
DIGITAL
DISPLAY
POWER
SUPPLY
WIRING TO
L1, L2
12.2 Sequence Of Operations
On call for heat, thermostat will actuate, completing
circuit to limit� In turn, circulator and ignition systems are
activated and ignition will begin�
In event boiler water temperature exceeds high limit
setting on boiler mounted limit, power will be interrupted
between limit and ignition system. Power will remain off
until boiler water temperature drops below high limit
setting� Circulator will continue to operate under this
condition until thermostat is satisfied.
21
THERMAL/ LWCO
C2, C1
GROUND
CIRCULATOR
WIRING
PN 240013073, Rev. A [08/31/2020]
INDICATOR
LIGHTS
WIRE
PIN
HI-LIMIT &
LO-LIMIT
SETTINGS
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