Measurement; Gas Furnace Startup; Staged, Modulating, And Ultra; Modulating - Trane IntelliPak RA 20 Installation, Operation And Maintenance Manual

For relief fans, check the nameplate model number on
the fan to determine the K-factor, see table below.
Table 25. K-factor for relief fans
Fan Model
K3G500
K3G560
Use this equation to determine flow for relief fans:
Where K is determined based on the fan model
number, ρ is standard air density of 0.075 lb/ft
s
ambient air density, and ΔP is the pressure differential
measured by the pressure transducer. The equation
gives flow for one fan. Airflow must be multiplied by
the number of fans installed in the unit.
Traq™ ™ Sensor Airflow Measurement
( ( O O p p t t i i o o n n a a l l w w i i t t h h a a l l l l u u n n i i t t s s e e q q u u i i p p p p e e d d w w i i t t h h a a n n
e e c c o o n n o o m m i i z z e e r r ) )
1. Use to program the following system components
for Economizer operation by scrolling through the
displays;
• Supply Fan (On)
• Outside air dampers (Selected % Open)
• Variable Frequency Drive (100% Output, if
applicable)
• Outside Air CFM Setpoint
• Outside Air Pre-Heater Operation (if applicable)
2. Navigate to Supply Fan Manual Overrides. The
supply fan speed will be adjusted through the user
interface. With the unit in Stop, touch the Manual
Override button for the Supply Fan. Set the Fan
Speed to 100%.
3. With the unit operating in the "Manual Override",
the amount of outside air flowing through the
Traq™ sensor can be viewed.
4. Navigate to the "ECONOMIZER POSITION" and
read the corresponding damper opening
percentage (%).

Gas Furnace Startup

Staged, Modulating, and Ultra

Modulating

It is important to establish and maintain the
appropriate air/fuel mixture to assure that the gas
furnace operates safely and efficiently.
The volume of air supplied by the combustion blower
determines the amount of oxygen available for
combustion, while the manifold gas pressure
establishes fuel input. By measuring the percentage of
RT-SVX063E-EN
K-factor
281
348
3
, ρ is
a
carbon dioxide produced as a by-product of
combustion, the operator can estimate the amount of
oxygen used and modify the air volume or the gas
pressure to obtain the proper air/fuel ratio.
Confirming the correct air/fuel mixture for a furnace
results in rated burner output, limited production of
carbon monoxide, and a steady flame that minimizes
nuisance shutdowns.

High-Fire Adjustment

W W A A R R N N I I N N G G
H H a a z z a a r r d d o o u u s s G G a a s s e e s s a a n n d d F F l l a a m m m m a a b b l l e e
V V a a p p o o r r s s ! !
F F a a i i l l u u r r e e t t o o o o b b s s e e r r v v e e t t h h e e f f o o l l l l o o w w i i n n g g i i n n s s t t r r u u c c t t i i o o n n s s c c o o u u l l d d
r r e e s s u u l l t t i i n n e e x x p p o o s s u u r r e e t t o o h h a a z z a a r r d d o o u u s s g g a a s s e e s s , , f f u u e e l l
s s u u b b s s t t a a n n c c e e s s , , o o r r s s u u b b s s t t a a n n c c e e s s f f r r o o m m i i n n c c o o m m p p l l e e t t e e
c c o o m m b b u u s s t t i i o o n n , , w w h h i i c c h h c c o o u u l l d d r r e e s s u u l l t t i i n n d d e e a a t t h h o o r r s s e e r r i i o o u u s s
i i n n j j u u r r y y . . T T h h e e s s t t a a t t e e o o f f C C a a l l i i f f o o r r n n i i a a h h a a s s d d e e t t e e r r m m i i n n e e d d t t h h a a t t
t t h h e e s s e e s s u u b b s s t t a a n n c c e e s s m m a a y y c c a a u u s s e e c c a a n n c c e e r r , , b b i i r r t t h h d d e e f f e e c c t t s s , ,
o o r r o o t t h h e e r r r r e e p p r r o o d d u u c c t t i i v v e e h h a a r r m m . .
I I m m p p r r o o p p e e r r i i n n s s t t a a l l l l a a t t i i o o n n , , a a d d j j u u s s t t m m e e n n t t , , a a l l t t e e r r a a t t i i o o n n , ,
s s e e r r v v i i c c e e o o r r u u s s e e o o f f t t h h i i s s p p r r o o d d u u c c t t c c o o u u l l d d c c a a u u s s e e
f f l l a a m m m m a a b b l l e e m m i i x x t t u u r r e e s s o o r r l l e e a a d d t t o o e e x x c c e e s s s s i i v v e e c c a a r r b b o o n n
m m o o n n o o x x i i d d e e . . T T o o a a v v o o i i d d h h a a z z a a r r d d o o u u s s g g a a s s e e s s a a n n d d
f f l l a a m m m m a a b b l l e e v v a a p p o o r r s s f f o o l l l l o o w w p p r r o o p p e e r r i i n n s s t t a a l l l l a a t t i i o o n n a a n n d d
s s e e t t u u p p o o f f t t h h i i s s p p r r o o d d u u c c t t a a n n d d a a l l l l w w a a r r n n i i n n g g s s a a s s p p r r o o v v i i d d e e d d
i i n n t t h h i i s s m m a a n n u u a a l l . .
W W A A R R N N I I N N G G
E E x x p p l l o o s s i i o o n n H H a a z z a a r r d d ! !
F F a a i i l l u u r r e e t t o o p p r r o o p p e e r r l l y y r r e e g g u u l l a a t t e e p p r r e e s s s s u u r r e e c c o o u u l l d d r r e e s s u u l l t t
i i n n a a v v i i o o l l e e n n t t e e x x p p l l o o s s i i o o n n , , w w h h i i c c h h c c o o u u l l d d r r e e s s u u l l t t i i n n d d e e a a t t h h , ,
s s e e r r i i o o u u s s i i n n j j u u r r y y , , o o r r e e q q u u i i p p m m e e n n t t o o r r p p r r o o p p e e r r t t y y - - o o n n l l y y - -
d d a a m m a a g g e e . .
W W h h e e n n u u s s i i n n g g d d r r y y n n i i t t r r o o g g e e n n c c y y l l i i n n d d e e r r s s f f o o r r
p p r r e e s s s s u u r r i i z z i i n n g g u u n n i i t t s s f f o o r r l l e e a a k k t t e e s s t t i i n n g g , , a a l l w w a a y y s s p p r r o o v v i i d d e e
a a p p r r e e s s s s u u r r e e r r e e g g u u l l a a t t o o r r o o n n t t h h e e c c y y l l i i n n d d e e r r t t o o p p r r e e v v e e n n t t
e e x x c c e e s s s s i i v v e e l l y y h h i i g g h h u u n n i i t t p p r r e e s s s s u u r r e e s s . . N N e e v v e e r r p p r r e e s s s s u u r r i i z z e e
u u n n i i t t a a b b o o v v e e t t h h e e m m a a x x i i m m u u m m r r e e c c o o m m m m e e n n d d e e d d u u n n i i t t t t e e s s t t
p p r r e e s s s s u u r r e e a a s s s s p p e e c c i i f f i i e e d d i i n n a a p p p p l l i i c c a a b b l l e e u u n n i i t t l l i i t t e e r r a a t t u u r r e e . .
1. Program the following system components for
operation by scrolling through the User Interface
displays:
G G a a s s H H e e a a t t
a. Open the manual gas valve, located in the gas
heat section.
b. Navigate to the Gas Heat Manual override
screen and set the modulating percentage to
100% or enable the 1st stage. Touch the Auto
button.
c. Turn the Supply Fan on by navigating to the
Manual Override Screen. Set the Fan speed to
100%.
2. Once the system has started, check the appearance
S S t t a a r r t t u u p p t t h h e e U U n n i i t t
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