Matching The Transfer Duct Between The Two Heat Generators - PSG MINI-CADDY PF01301 Installation And Operating Instructions Manual

3.1.5 MATCHING THE TRANSFER DUCT BETWEEN THE TWO HEAT
GENERATORS
Install the plenum and heating ducts in line as in OPTION #1 and #2 of Section
3.1.15. Configurations shown in Examples 1, 2 and 3 of this same section are
prohibited.
Install the plenum and heating ducts in line as in OPTION #1 de la Section
3.1.15. In series connection should be considered only if in line connection is not
possible.
If the ducts are installed in series (Section 3.1.15, OPTION #2) and the existing
furnace's fan limit control is mounted on the plenum, the divider in the plenum
must be installed at least 5" (127 mm) above the fan limit control casing. This
divider must be air tight.
Do not install connecting ducts in a way that would allow inversion of the air flow.
Do not use elbows with a radius less than 6 inches (153 mm).
The transfer duct between the existing furnace and the add-on must be at least 260
square inches (0.16 m
OPTION #1 and #2 in Section 3.1.15).
DO NOT CONNECT TO A DOWN FLOW FURNACE.
DO NOT REMOVE, RELOCATE OR BYPASS ANY OF THE SAFETY
CONTROLS IN THE ORIGINAL FURNACE INSTALLATION.
You must determine the air flow through the existing furnace before installing the
Mini-Caddy add-on:
1. Run the furnace to which the Mini-Caddy add-on is connected until it reaches
its maximum temperature.
2. With a thermometer, measure the temperature of the cold air entering the
furnace and that of the air exiting the furnace in the hot air plenum.
Note: There can be a large lag in the readings of many commercially available
thermometers. Give them adequate time to stabilize when taking temperatures.
The temperature rise is obtained by subtracting the cold air return temperature
from that of the air exiting in the hot air plenum. The result (t) will be needed for
next step.
2
) and deviations radius must be at least 6" (153 mm). (See
WARNING
WARNING
17