27
Common Vent Installation
Systems
Power Vent
Direct Vent(Sealed Vent)
POWER VENTED
Dimensions Of Installation
DIRECT VENTED
Number of installing units
Common vent section pipe size
Maximum length of exhaust vent per unit
Allowed number of 90
º
elbow per unit
2
4 inches
50 ft
3
3
6 inches
60 ft
5
4
6 inches
60 ft
5
Number of installing units Common vent section pipe size Maximum length of Exhaust vent /
Air intake per unit
Allowed number of 90
°
elbow on Exhaust vent /
Air intake per unit
2
4 inches
20 ft
3
3
6 inches
30 ft
4
4
6 inches
30 ft
4
●
●
Applicable Model
GU195 (M) / 508 (11,12,21,22)1195 (M)
Common vent system is strictly applicable for GU195M model only. Only units that are connected by MCU wire with dipswitch
set up on main controller board (PCB) to operate as one group can be common vented together. It is required for vent system to
be perfectly impermeable to condensation and made out of corrosion resistant materials. The various funnel joints must be well
sealed in order to avoid any leakage of flue gases and/or condensatewater.
For more information on how to connect MCU wire or configure dipswitch setting please refer to
MCU Installation
section in the Operation Manual.
When common venting multiple units using the power vent setup for intake run, it is important to make sure the room is well
ventilated, temperature steady and sufficient clean air can be supplied for combustion air. It may be necessary to use an air filter.
For more detial on how to setup power vent for intake please refer to
Venting Specification
section in Operation Manual.
The direct venting system can use the same piping material for air intake as the power venting system. It's not required for
intake and exhaust vent to be in same direction. The termination can be on either right or left side of the units.
Reduce the maximum allowable length for each elbow used as follows:
- 45 Degree elbow: Deduct 3 feet
- 90 Degree elbow: Deduct 5 feet
Example: when installing 2 units on 4" common vent, the maximum vent length per unit is 50'. If 3x90
ْ
elbows are used on unit #1 then
the max run for unit #1 cannot exceed 35' but if only 2x90
ْ
elbows are used on unit #2, then max vent run for unit #2 can go up to 40'.
WARNING
!
!
Maximum only up to 4x GU195M
s
can be common vented together. In the case of installing 8x GU195M
s, two set
of isolated common vent system should be used.
Air
lter
Exhaust
Intake
Condensate drain
Common vent section (L)
12"
min 1ft
17"
●
●
*
Allow minimum length of 6" vent run vertically off the water heater using 3" pipe is required before using any elbow or T-joint
connection. 2" pipe is not allowed when using common vent system.
To avoid accumulation of condensate water in exhaust vent run, it's recommended to start off the horizontal section lower then slope
upwards with no less than 1/4 per foot towards the venting termination to allow condensation flow back into the unit.
Note: T-joint connection is considered as 1x90
ْ
elbow.
Содержание GU145 (S)
Страница 5: ...5 Dimensions GU145 S 508 11 12 21 22 1145 S GU195 S M 508 11 12 21 22 1195 S M ...
Страница 6: ...6 Parts Diagram for Model GU145 S 508 11 12 21 22 1145 S GU195 S M 508 11 12 21 22 1195 S M ...
Страница 7: ...7 Parts Diagram for Model GU145 S 508 11 12 21 22 1145 S ...
Страница 50: ...50 DIAGNOSTICS Before calling for service review the following diagnostic steps rst for saving time and money ...
Страница 56: ...56 Wiring and Connection Diagram Wiring Diagram MODEL GU195 M 508 11 12 21 22 1195 M ...