GENERAL
Page 8
505023M 08/11
Zone Control Panel Jumpers (General Information)
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 5). These
jumpers define 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 &
E−HEAT JUMPERS
Figure 5. 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 be-
fore touching the circuit board.
How 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 specific 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% position, you will direct airflow midway between the blow-
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 6. VSM Adjustment Band Example
By installing jumpers at different % on each PIAB bank,
you can direct different amounts of air volume to each
zone. You must jumper a % on zone 1 and at least one oth-
er zone, and you must jumper OFF on unused zones as
shown in figure 7.
Pin shown with
jumper on
ZONE 1 AT 10%.
Pin shown with
jumper on
ZONE 2 AT 0%
(allows min. cfm
airflow).
ZONE 1 ZONE 3
PIAB PIAB
ZONE 2 ZONE 4
PIAB PIAB
NOTE − Only zones 2,
3, & 4 have an OFF
setting.
ZONES 3
AND 4 ARE
SHOWN
NOT USED
(JUMPERS
SET ON
OFF").
Figure 7. PIAB Jumper Settings (typical)
NOTE − The blower speed may be affected by the reduc-
tion jumpers, if installed. See Page 9.
Upgrading from Harmony II
®
?
NOTE − If replacing a Harmony II
®
system, use conversion
values in table 4 to maintain equivalent air settings when
setting up the Harmony IIIt system.
Table 4. Air jumper positions conversion chart
Model Equivalent Positions (%)
Harmony II
®
25 35 45 55 65 75 85 95
Harmony IIIt 0 10 30 40 50 70 80 90
Zone 1 PIAB Jumpers – 140ºF DAS
Zone 1 PIAB terminal strip has an additional jumper setting
(labeled 140F DAS) that may be used for added operation-
al flexibility (see figure 8). When the supplied jumper is in
place across both pins, the discharge air sensor (DAS) up-
per limit will be 140°F instead of 160°F (default) to provide
added operational flexibility.
NOTE − If the heating stag-
ing jumper is set to either
120 or 130 and the 140F
DAS jumper is in place, the
furnace will stage up at
115°F and down at 130°F
(see Page 10).
HEATING STAGING
JUMPERS
COOLING STAGING
JUMPERS
CONTINUOUS AIR
REDUCTION JUMPERS
HEATING AIR
REDUCTION JUMPERS
PIAB
JUMPERS
Figure 8. 140F DAS Jumper
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