28
furnace looks at air volume and determines proper firing rate based on DIP
switch 14-19 settings. See SLP98 Installation Instructions for adjustment
options.
3.3.2. Integrated Furnace Control W2 terminal to Harmony III
zoning system Control
Since the furnace automatically adjusts firing rate to match CFM to achieve a target
temperature rise, connection of Harmony III zoning system control to
W2
terminal
on the integrated control is not required.
With
W2
connected, lower firing rates can be used for
W1
demand usually resulting
in greater comfort levels per zone. If temperature cannot be maintained, then
W2
will quickly increase firing rates to satisfy demand.
If discharge air temperature is too low, the integrated control
W2
can be connected
to Harmony III zoning system control to cause the furnace to increase firing rate.
Every two minutes, the integrated control looks at
W2
. If
W2
is ON, the firing rate
increases by 5%. This 5% increase is added to the desired firing rate as determined
by the PWM. Therefore, if a 50% duty cycle corresponds to a 70% firing rate, after
2 minutes of
W2
, that same 50% duty cycle will correspond to a 75% firing rate.
This will last for the remainder of the heat cycle.
When
W2
goes from ON to OFF, the integrated control decreases the firing rate
by 5%.
3.3.3. Installation Setup Worksheets
3.3.3.1. SLP98V — Cooling/Heating (Non-Heat Pump Applications)
Job Name:
Indoor Unit Model:
Outdoor Unit Model:
Indoor Unit Setup:
√ Cut on-board link W914 DEHUM OR HARMONY (R to DS) on furnace IFC control (if not cut, fuse
will blow in Harmony III zoning system control board)
√ W2 connection from Harmony III zoning system to SLP98 is optional – see Harmony III zoning
system / furnace installation instructions for details
√ DIP switch settings (ON or OFF):
DIP Switch
ON or OFF
Condition
1
OFF
DIP switch 1 – leave at factory setting – ignored by Harmony
III zoning system
2
OFF
DIP switch 2 – leave at factory setting – ignored by Harmony
III zoning system
3
OFF
DIP switch 3 – leave at factory setting – ignored by Harmony
III zoning system
4
ON
DIP switches 4 and 5 determine heating blower “off” delay –
recommended 180 seconds
5
ON
Job Name:
Indoor Unit Model:
Outdoor Unit Model:
Indoor Unit Setup:
√ Cut on-board link W914 DEHUM OR HARMONY (R to DS) on furnace IFC control (if not cut, fuse
will blow in Harmony III zoning system control board)
√ W2 connection from Harmony III zoning system to SLP98 is optional – see Harmony III zoning
system / furnace installation instructions for details
√ DIP switch settings (ON or OFF):
6
OFF
DIP switches 6 and 7 – leave at factory setting – ignored by
Harmony III zoning system
7
OFF
8
DIP switches 8 and 9 – cooling blower speed – determines
maximum system CFM – see G71MPP blower tables)
9
10
DIP switches 10 and 11–cooling blower adjust–determines
maximum system CFM – see G71MPP blower tables
11
12
OFF
DIP switches 12 and 13 – leave at factory setting – ignored
by Harmony III zoning system
13
OFF
14
OFF
DIP switches 14,15,and16 – sets low fire, minimum capacity,
firing rate - DEFAULT SETTING SHOWN and IS
RECOMMENDED STARTING POINT– see Harmony III
zoning system/furnace install instruction
15
OFF
16
OFF
17
OFF
DIP switches 17,18 and 19 – sets high fire, 100%
capacity, firing rate - DEFAULT SETTING SHOWN and IS
RECOMMENDED STARTING POINT– see Harmony III
zoning system/furnace install instruction
18
OFF
19
OFF
Summary of Contents for Harmony III
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