Determine The W180 System Requirements - Honeywell W180 User Manual

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.
Function
Auto Switch- This is the minimum length of time the system
over Time will wait before automatically switching from
(Minutes) heat to cool or cool to heat.
Minimum The minimum aggregate damper open area will
Duct Area— never be lower than this setting in the heating
Heat (Percent) mode. Dampers to zones not calling for heat
will modulate partially open when the system
demand alone does not provide adequate open
damper area.
Minimum The minimum aggregate damper open area will
Duct Area— never be lower than this setting in the cooling
Cool mode. Dampers to zones not calling for cooling
(Percent) will modulate partially open when the system
demand alone does not provide adequate open
damper area.
HVAC CONFIGURATION TABLE.
Definition
17
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:
Minimum Maximum
10 240
25 100
35 100
W180 ZONE CONTROL SYSTEM
Default
10
25 (75 to
85% max cfm)
35 (65 to
75% max cfm)
(Continued)
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