Lennox GCWB95W-150 Installation Instructions

36
240012994 Rev. B [08/31/2020]
8 - ELECTRICAL CONNECTIONS
A. Connect Room End Switch
• turn power o to boiler;
• access terminal block M2;
• connect room end switch to terminals 6(R)-7(W)-
8(C); Do not apply voltage between 2 terminals. Dry
contact only.
• turn boiler power on;
• verify room end switch operates per end switch
manufacturer instructions.
NOTE: maximum load allowed is 10 mA
Dry contact end switches from various manufacturers can be
attached to boiler control PCB.
FIGURE 8-4 Thermostat Connections
8.6 Install Room Thermostat
Install room thermostat on inside wall. Do not install where it
will be inuenced by drafts, hot or cold water pipes, lighting
xtures, television, sun rays or near a replace.
Dry contact only - do not apply 24 volts between 6 and 7.
A
Room End
Switch
8.7 Optional Electrical Connections
A. 1K Ohm (1K Ω) Outdoor Temperature Sensor
To connect this accessory, see gure 8-5, terminals 4-5, and
instructions supplied with
1K Ω sensor.
B. Setting "Kt" Climate Curve
When external
1K Ω sensor is connected to boiler, the
electronic board adjusts the ow temperature calculated
according to set Kt coecient.
Select required curve by pressing
as indicated in
chart below for selecting the appropriate curve (00 to 90).
Flow temp Outside temp
NOTE:
Temperatures below -40 °F (-40 °C), maximum heating ow temperature set point no longer increases, curves shown on graph
become horizontal.
Boiler set-point will override sensor set-point.
FIGURE 8-5 Outdoor Sensor Connections
FIGURE 8-6 Kt Climate Curves
80 Is Default.
Note
Sensors used for this boiler are proprietary to
the manufacturer. Use of after market sensors
will diminish boiler performance.
1K Ω

Lennox GCWB95W-150 Specifications

General

Brand	Lennox
Model	GCWB95W-150
Category	Boiler
Language	English