Lennox Harmony III User Manual

9
4 shows how the dampers may be linked to distribute some of the air from a small
zone into another zone.
Zone 2 (largest zone)
Zone 1 (smallest zone)
This damper is linked to the zone 1
damper; it opens when Zone 1
opens to redirect some air away
from Zone 1 and closes only when
zone 1 damper closes.
RELAY
ZONE 2
DAMPER
DAMPER
DAMPER
All Zone 2
dampers
open only
for calls to
Zone 2
calls for air.
DAMPER
ZONE 1
Note: Zone
Dampers are
Power-Close
type.
Figure 5. Zone Linking
Table 9. Zone Demands to Small and Large Zones
Zone Dampers
ZonewithDemand
None Small Sm.& Lg. Large
Small Zone Closed (24V) Open (0V) Open (0V) Closed (24V)
Large Zone
Closed (24V) Open (0V) Open (0V) Open (0V)
Closed (24V) Closed (24V) Open (0V) Open (0V)
Closed (24V) Closed (24V) Open (0V) Open (0V)
NOTE: Zone Dampers are Power-Close type.
1.10. Zone Control Panel Jumpers
1.10.1. Setup for Controlling Equipment Staging and Volume of Air
to Zones
This section provides information for installing jumpers on the zone control panel
jumper banks (see “Figure 6. Zone Control Panel Jumper Banks”). These jumpers
denehowthezonecontrolsystemfunctionstocontrolequipmentstagingandto
deliver the proper amount of CFM to the zones.
HEATING STAGING
JUMPERS
COOLING STAGING
JUMPERS
CONTINUOUS AIR
REDUCTION JUMPERS
HEATING AIR
REDUCTION JUMPERS
PIAB
JUMPERS
SYS CONFIG AND
E-HEAT JUMPERS
Figure 6. Zone Control Panel Jumper Banks
CAUTION
Static electrical discharge will damage electronics.
Discharge static electricity before touching the zone control panel. Touch a
grounded metal object before touching the circuit board.
1.10.2. PIABJumpersAffectBlowerOperation
A variable-speed motor will operate at its minimum speed or at any increment
faster up to its maximum speed. The Percentage Into Adjustment Band (PIAB)
jumpers control the speed variance of the motor. When the zone control’s PIAB
jumpers are set to 0%, the blower operates at the minimum air volume produced
by the air handler and when set to 100%, the blower operates at maximum air
volume produced by the air handler (see your air handler installation instructions
forspecicCFMs).
For example: if an air handler has a minimum air volume of 800 CFM,
and a maximum of 1500 CFM, and the jumper is set to 0%, the air
delivered to the zone will be 800 CFM. Similarly, if the jumper is set to
100%, the air delivered to the zone is 1500 CFM. By placing a jumper
in the 50%
er's minimum and maximum CFM capacities.
PIAB JUMPER = 0%
MIN. 800 CFM
PIAB JUMPER = 100%
MAX. 1500 CFM
(MOTOR RUNS AT
MINIMUM SPEED)
(MOTOR RUNS AT
MAXIMUM SPEED)
(MOTOR RUNS AT VARIABLE SPEEDS)
PIAB JUMPER = 50%
MID. 1150 CFM
Figure 7. VSM Adjustment Band Example

Lennox Harmony III Specifications

General

Brand	Lennox
Model	Harmony III
Category	Control Systems
Language	English