All installations and services must be performed by qualified personnel.
BLOWER TIME DELAY
In cases where the yellow wires are used to start and stop the hydronic pump, SW2 may used to delay
when the blower is cycled on or off to increase comfort and efficiency.
Use Table D1 to set the switches appropriately
Table D1: Delays before blower cycles “ON or “OFF”
SW2 Positions
“ON” Delay
SW2 Positions
“OFF” Delay
1 2
(Seconds)
3
4 (Minutes)
OFF OFF
30
OFF OFF
2
ON
OFF
60
ON
OFF
4
OFF
ON 120
OFF
ON 6
ON ON
480
ON ON
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DUCT SYSTEM
The duct system and load sizing calculation should follow the design standards of Air Conditioning
Contractors of America (ACCA) - manuals D & J - or the American Society of Heating, Refrigeration and
Air Conditioning Engineers, Inc. (ASHRAE) Latest Edition Fundamentals Volume.
To aid you in evaluating existing duct systems quickly, review the chart on Page 11 which shows the
CFM capacity for square inch areas, based on .10" wc static pressure (SP) loss on the supply systems.
Each of the system's components (trunk lines, take-offs, runs and register and grill-free areas) must be
properly sized and matched together to ensure you are obtaining the air handling capacity of the duct
system. A 12x8 duct with a 400 CFM capacity, for example,
MAY NOT
flow 400 CFM if the register(s)
to which it connects can only flow a total of 200 CFM.
The air handling capacity
MUST BE EQUAL TO
the supply system at a minimum when sizing the
return air duct system. It is recommended to follow design parameters set down by ACCA or ASHRAE
on the return air duct systems.
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