Odyssey
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Installation and Operation Instructions - Field Wiring
CT80-250
28
9.0 FIELD WIRING
All wiring and electrical grounding must be in accordance with local codes and the applicable National Electrical
Code, NFPA 70 (USA) or CSA C22.2 (Canada). Ensure that the wiring complies with this manual.
Avoid Shocks - To Avoid Electrical Shock, turn off electrical power to the boiler prior to
opening any electrical box within the unit. Ensure the power remains off while any
wiring connections are being made. Failure to follow these instructions may result in component failure, serious
injury or death.
Wire Protection - When passing any wiring through the casing of any component or
electrical box, the installer must use wire grommets suitable for securing the wiring and
preventing chafing. Failure to follow instructions may result in component failure, serious injury or death.
Burner Primary Safety - Blocked Vent Switch and any other limit device must break
power to the burner primary (B1). Failure to follow these instructions may result in
serious injury or death.
Labeling - Label all wires prior to disconnecting them when servicing controls. Wiring
errors can cause improper and dangerous operation. Failure to follow instructions may
result in property damage or personal injury.
Connection Description
T-T
Heat Demand Input (Dry Contact) - from heating thermostat or zone controller. Contact closure
indicates to the controller that there is a heating demand, controller will apply Thermal Targeting
WWSD
Outdoor Temperature Sensor (Factory Supplied) – Connecting the OD Sensor to WWSD and C enables
the Warm Weather Shutdown feature of the controller. Control will not respond to T-T demands when the
outdoor temperature is above the WWSD setting.
C
OR
Outdoor Temperature Sensor (Factory Supplied) – Connecting the Outdoor Sensor to OR and C
disables Thermal Targeting and enables full Outdoor Reset functionality, including Warm Weather
Shutdown.
Table 9-2 Electrical Field Connections - Line Voltage
Connection Description
L1
Power Supply Hot – 120VAC input for the controller. Installation codes require the installation of a
service switch to break line voltage to the appliance. Power supply must be protected with 15 Amp circuit
breaker or fuse.
L2
Power Supply Neutral – Location for connecting the Neutral of the power supply.
C2
Circulator Neutral – Location for connecting the Neutral to the circulator.
C1
Circulator Hot – 120VAC output to circulator (5.8 FLA max.)
B1
Burner Hot – 120VAC output to burner (7.4 FLA max.). Additional safety limits, i.e. LWCO and/or
Blocked Vent Switch, must be installed in series with this circuit. B1 is the Burner Primary.
B2
Burner Neutral – Location for connecting the Neutral to the burner.
ZC
Priority Zone Output (120VAC) – Power supply for priority zone, power is always present at ZC unless
the LO TEMP temperature is not attained.
ZR
Priority Zone Input (120VAC) – When power is applied to ZR from ZC, via a contact closure of an
Indirect Tank Thermostat, when Zone/Indirect Switch is set to “I”, the control overrides Thermal Targeting
and Outdoor Reset functions, and operates to the HI TEMP setting. When Zone/Indirect Switch is set to
“Z”, the control interprets the call as an end switch from Priority Zone relay, and operates as a central heat
demand performing Thermal Targeting or Outdoor Reset functions.
