Tjernlund Products, Inc. Tjernlund draft inducers, power venters, ventilation



 

 

 

 Combustion Air In-Forcer
.

 
RESIDENTIAL / LIGHT COMMERCIAL COMBUSTION AIR IN-FORCER™

Combustion Air In-Forcer
Support Documents
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PAI-2G, 2O Lit
Ventilation Products Lit
PAI-2G, 2O Inst

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THE PROBLEM:
Incomplete combustion or poor draft due to inadequate combustion air in too-tightly constructed buildings can result in carbon monoxide creation, poor equipment efficiency, reduced equipment life and nuisance service calls.
 
  THE SOLUTION:
The IN-FORCER mechanically draws outside air indoors on demand to provide fresh air for safe and efficient operation of fuel burning equipment.

The Combustion Air IN-FORCERTM offers all these advantages:
   Affordably priced and installs fast with simple electrical interlock.    Reduces cold air drafts through windows, doors, fireplaces caused by excessive negative pressure.
   Automatic regulated control of incoming fresh, combustion air.    Light indicates IN-FORCER is operating properly.
   Uses indoor air to temper outdoor air for increased comfort.    Interlock shuts down burner if intake elbow is blocked or performance is significantly reduced.
   Damper closes during off cycles to prohibit cold air entry and warm air loss.    Helps replace air vented by exhaust fans, fireplaces, etc.
   Reduces negative pressure, a major cause of flue gas spillage and radon gas entry.  

Steps to Selecting the Right Combustion Air IN-FORCERTM

                                  MODEL PAI-2G                                                 MODEL PAI-2O
                  (For 24 VAC Control Circuits)                      (For 115 VAC Control Circuits)
 

Step 1) Determine the required CFM from Table A based on equipment type and BTU/hr. input of the heater(s).
 
Step 2) Calculate the equivalent length of the 3" PVC inlet pipe and the 6"outlet duct (if used) from Table B.
 
Step 3) Referencing Table C and your calculated equivalent length, verify that the CFM performance listed in  Table C is equal to or greater than that determined in Table A. Select Model PAI-2G or PAI-2O Series based on control circuit voltage.

REQUIRED CFM BASED ON EQUIPMENT TYPE AND BTU/HR INPUT  (TABLE A)
BTU/HR INPUT
GAS ATMOSPHERIC
GAS INDUCED COMBUSTION
OIL FLAME RETENTION
40,000
 21
11
12
50,000
 26
14
15
60,000
 32
17
18
70,000
 37
19
21
80,000
 42
22
24
90,000
 47
25
27
100,000
 53
28
30
110,000
 58
30
33
120,000
 63
33
37
130,000
 68
36
40
140,000
 74
39
43
150,000
 79
41
46
160,000
 -- 
44
49
BTU/HR INPUT
GAS ATMOSPHERIC
GAS INDUCED COMBUSTION
OIL FLAME  RETENTION
170,000
--
47
52
180,000
--
50
55
190,000
--
52
58
200,000
--
55
61
210,000
--
58
64
220,000
--
61
67
230,000
--
63
70
240,000
--
66
73
250,000
--
69
76
260,000
--
72
79
270,000
--
74
--
280,000
--
77
--
290,000
--
80
--
 
CALCULATING EQUIVALENT LENGTH (TABLE B)

The performance shown is based on equivalent feet. To determine the equivalent feet of an installation add the length of the 3" PVC inlet pipe plus the equivalent length of any elbows. Do not include the intake elbow or gooseneck equivalent loss, they have already been factored into the performance data. Use the same method to determine the equivalent feet if a 6" outlet duct is installed.
 
EQUIVALENT LENGTH OF ELBOWS
ELBOW DIAMETER
90 degree elbow
45 degree elbow
3"  PVC
5'
2.5'
6"
10'
5'
 
IN-FORCERTM PERFORMANCE DATA (TABLE C)
Conventional straight thru wall intake

Models PAI-1G & PAI-1O (Discontinued)  
Models PAI-2G & PAI-2O
 

** Below Fan Prover Set Point

  
Optional gooseneck intake

Models PAI-1G & PAI-1O (Discontinued)
Models PAI-2G & PAI-2O
 

** Below Fan Prover Set Point
 

DIMENSIONS & MOTOR SPECIFICATIONS

A
B
C
D
E
F
17 3/4"
15 5/8"
8 7/8"
2 5/8"
8"
9 3/8"

MOTOR SPECIFICATIONS
115/1/60       1600 RPM      80   WATTS    1.0  FLA

 

 

 

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