17
68-0139
W180 ZONE CONTROL SYSTEM
CAUTION
The W180 System requires an earth ground from
the earth ground terminal (18 AWG or heavier
wire connected to a cold water pipe) as shown in
Fig. 24.
DETERMINE THE W180 SYSTEM
REQUIREMENTS
1. Obtain a copy of the floor plans and check that there
is no conflict between the building design and the pro-
posed installation.
NOTES:
a. Mount the W180A Controller in a centralized loca-
tion to minimize wire runs though the building.
b. Mount the S321A Touchpads in any convenient in-
door locations.
c. Use low voltage controls for HVAC units.
2. Complete the HVAC Configuration Form to deter-
mine the temperature sensor inputs and zoning, relay out-
put usage (set automatically by the Setup software), HVAC
system information, and number of S321A Touchpads.
NOTES:
a. HVAC Configuration Worksheet—Use the configu-
ration worksheet (located in Appendix B) to make
sure that System configuration and hardware limits
are not exceeded. Before entering temperature sensor
data or other information, enter the customer data on
the worksheets.
b. Temperature input usage—Each temperature zone
needs a temperature sensor. A temperature zone with
no damper or valve designated operates the associ-
ated heating/cooling system like a thermostat would
in the same location. When the heating system is
zoned, indicate if dampers or valves are to be used.
Make sure the names used correspond to the names
used on the relay assignments. When combining
hydronic or radiant heating with forced air cooling to
serve common areas, use separate sensors for each
system.
c. Relay output usage—The 12 relay sets are electri-
cally independent and perform different tasks de-
pending on the assignments. There are a total of 24
relays available. Add together all relays required to
operate the HVAC equipment. The remaining relay
pairs can be used to operate dampers and valves.
Each modulating damper requires two relays in a
relay pair. All other valves and HVAC equipment
loads require one relay each. Calculate the total num-
ber of relays required by the proposed system. The
total number of relays required cannot total more
than 24. Note that a relay set shares the same input;
therefore, the devices connected to each relay of a set
must use the same voltage supply. If the two devices
controlled by the two relays within a relay pair are
powered by different voltage supplies (transform-
ers), use a separate relay to isolate the two voltage
supplies (Fig. 23).
d. T7660B Space Temperature Sensor—This sensor
requires two sensor inputs and one relay output.
e. HVAC—The System is compatible with all common
residential HVAC systems that use low voltage con-
trols (thermostats) for operation. The following are
required for configuration:
HVAC CONFIGURATION TABLE.
Function
Definition
Minimum
Maximum
Default
Auto Switch-
over Time
(Minutes)
This is the minimum length of time the system
will wait before automatically switching from
heat to cool or cool to heat.
10
240
10
Minimum
Duct Area—
Heat (Percent)
The minimum aggregate damper open area will
never be lower than this setting in the heating
mode. Dampers to zones not calling for heat
will modulate partially open when the system
demand alone does not provide adequate open
damper area.
25
100
25 (75 to
85% max cfm)
Minimum
Duct Area—
Cool
(Percent)
The minimum aggregate damper open area will
never be lower than this setting in the cooling
mode. Dampers to zones not calling for cooling
will modulate partially open when the system
demand alone does not provide adequate open
damper area.
35
100
35 (65 to
75% max cfm)
(Continued)
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