Filter
Top Products
Page 4
6. Install the thermostats. Refer to the instructions
provided with the thermostat.
Any 24-volt electronic thermostat with a “C” (24 VAC
common) terminal can be used. Power robbing
thermostats can cause unintended operation –
DO NOT use mechanical or power robbing
thermostats. Table 2 lists the required terminals
and recommended Lennox thermostats:
18 AWG thermostat wire minimum recommended.
TABLE 2 – THERMOSTAT REQUIREMENTS
Recommended
Type Terminals
Thermostat
HEAT/COOL R, C, W, Y, G
• SignatureStat 1H/1C
(51M26)
• Elite 1H/1C (49M55)
Thermostat Terminal Function
R 24 VAC Hot
C 24 VAC Common
W Heat
Y Cool
GFan
7. Install the dampers. Refer to the instructions provided
with the damper.
18 AWG thermostat wire minimum recommended.
Installation (continued)
5. Install the required transformer selected from Table 1
– DO NOT USE the HVAC equipment transformer to
power the control panel. Refer to the instructions
provided with the transformer.
18 AWG thermostat wire minimum recommended.
Sizing the Transformer:
The system requires approximately 10 VA for the
control panel and thermostats and 10 VA for each
damper. The size of the transformer will depend on the
greatest number of dampers that could be energized
at any given time (at least one zone’s dampers will not
be energized during a heating or cooling call when
using power close, spring open dampers). The size of
the transformer must not exceed 75VA. If the value is
greater than 75VA, some dampers will need to be
powered by a separate transformer – refer to Field
Wiring Damper Diagram 2 on page 6.
For instance, if you have 3 dampers, then you would
require 10VA for the system, 20VA (10VA X 2) for the
dampers for a total of 30VA, so catalog number 10P17
would be an adequate transformer size at 40VA.
The transformers listed in this chart include a plate
mount for a 4" square electrical box.
TABLE 1 – TRANSFORMERS
Part Number Size Voltage Description
10P17 40VA 120/208/240V-24V
10P87 50VA 120/208/240V-24V
12P61 75VA 120/208/240V-24V
83P74 4" Square Electrical Box