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WF-LGR3 & WF II WIRING & SETUP
WF-LGR3
Application – Standard heat pump room thermostat, heat pump, WF II Electro-Mate, gas/oil furnace. HP
manufacturer's fossil fuel kit is not required.
Reference Drawing HH316
1. Attached to the WF-LGR3 is a cable harness that interfaces between the WF II and the WF-LGR3.
Note: Units produced after 08-04-04 (ARL #3074 and up) have an updated control board. This
update increases the size of the interface header from a four place to a ten place. See photo below
for proper cable installation.
2. Requirements:
3. Room Thermostat Connections – Including emergency and stage 2 connections
a. Install room thermostat at the desired room location with typical 8-wire thermostat cable
to the WF-LGR3.
Note: If this is a mechanical stat, adjustment of the heat anticipator is required, set
the heat anticipator to 0.2.
b. Thermostat Stage 2, Typically W or W1 - WarmFlo II does not incorporate Stage 2
function, there is no termination or connection for this wire. Nor is Stage 2 an optional
pickup point for any other function related outside of the WarmFlo II control
requirements. Simply leave unterminated or unused.
c. Thermostat Emergency, Typically E – If emergency hookup is requested or required
by the homeowner, see next page, paragraph 6, need to make the choice on emergency
switch action and note the comments concerning blower.
4. WF-LGR3 Connections
a. Install two wires (yellow "Y" and green "G") from the 8-wire thermostat cable to the
WF-LGR3 upper left "stat" terminal block. If using emergency, wire according to above
guidelines. Basically the HP manufacturer's thermostat is connected directly to the
outdoor unit as specified by the HP manufacturer, except the below wiring exceptions:
•
The "Y" (first stage) is routed through this module.
•
The "G" (blower) always goes to this module or inside air handler.
•
The "E" (emergency) if emergency hookup is required simply attach emergency "E" from
thermostat connection to the BRN/YEL wire in the harness going to the WF II controller.
•
The "W" (second stage) is not used with the WarmFlo II™ product (reference thermostat
section).
Note: You can use this WF-LGR3 enclosure as a "wiring center or cable termination"
position for the room thermostat cable going to the outside unit. As shown on
HH316, the large black dots represent three tie points for R, C, and O. Again, for
11/01/2007
Thermostat connection
Fan Center/Gas furnace connection One 5-wire cable
Outdoor Heat Pump
15
One 8-wire cable
40VA or larger transformer
Blower connection "G" relay
One 4-wire cable
HI320
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