20
P/N 240009735, Rev. G [09/30/2016]
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 Hi-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 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�
Electrically bond boiler to ground in accordance with
requirements of authority having jurisdiction� Refer to:
USA- National Electrical Code, ANSI/NFPA 70.
Install fused disconnect switch between boiler and meter at
convenient location�
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.
12 - ELECTRICAL WIRING
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.
THERMAL/ LWCO
WIRE
PIN
POWER
SUPPLY
WIRING TO
L1, L2
C2, C1
CIRCULATOR
WIRING
Figure #19 - Hydrostat 3250 Hi-Limit/Low
Water Cutoff Control
INDICATOR
LIGHTS
DIGITAL
DISPLAY
HI-LIMIT &
LO-LIMIT
SETTINGS
GROUND