Thermostat Installation - ECR International AT Serie Manuel D'installation, D'utilisation Et D'entretien

Field Wiring - Continued
Limit Control Operation
1. MAIN POWER SUPPLY: Depending on model
designation, the electric Hydronic Block may
be energized by alternating current service
entrances: 240 volt single phase 50 or 60 cycle
3 wire plus ground. Wire size see Table 1.
Sizes listed for various capacity units include
total amperes necessary to operate elements,
circulator and zone valves where used. Wire sizes
specified conform to Canadian Electrical Code
(Canada) or National Electric Code (USA) and
include derating for ampacity and temperature.
Use copper wire only. Check state and local
requirements.
A. Read data name plate before connecting
unit. Electrical connections are provided and
located for proper installation.
B. Use only copper wire of proper size and make
sure all terminations are tight. Do not use
aluminum wire.
2.
CIRCULATOR POWER SUPPLY: Terminals
identified as C1(L) and C2(N) at bottom of control
panel (Figure 6) shall be used to supply one
circulator pump power. Circulator motor shall not
be larger than 1/6 horsepower with maximum
5.0 amp rating. Wiring from control panel to the
pump should have insulation rated 75°C. Circuit
protection is provided by 15 amp breaker on
boiler.
NOTE: If circulator pump is larger than maximum
size listed above, separate circulator pump relay
must be provided with separate overload protection.
Where more than one circulator is used for zoning,
it must be installed and protected according to
approved electrical codes.
Figure 6 - Thermostat and Pump Connection
ELECTRICAL CONNECTIONS
Note: AT Boiler will work with standard and
programmable setback thermostats.

Thermostat Installation

1.
Install thermostat on inside wall five feet above
floor.
2.
NEVER install thermostat on outside wall.
3. Do not install thermostat where it will be affected
by sunlight, drafts, televisions, lighting fixtures,
hot or cold pipes, fireplaces, or chimneys.
4.
Instructions for final adjustment of thermostat
(adjusting heating anticipator, calibration, etc.)
are packaged with thermostat.
5.
Recommended setting for heating
anticipator is 0.1 amps.
Wiring On Control
• PUMP: Connect only 120 Vac 1/6 hp (maximum)
pump to terminals C1(L) and C2(N) on controller.
Ground screw is located on control panel. Strip wire
ends before inserting into terminal block. Tighten
terminal screws. Do not use pump rated greater
than 5 amps!!
• THERMOSTAT: Two or three wire thermostat
capable. Terminals R(T), W(T) and C are provided.
Two wire thermostat use R(T) and W(T). Three wire
thermostat also use terminal C. See Figure 6. Do
not apply external power source to terminals!!
Strip wire ends before inserting into terminal block.
Tighten terminal screw clamps. Thermostat power
consumption shall not exceed 8 VA.
11
PN 240013676 REV. A [07/01/2022]