Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS - Manual (Page 17)

Figure 20 – Vertical DirectAire Installation with Rooftop
Combustion Air Inlet
Vent Kits
ƽ
WARNING: Only use a sidewall air inlet cap
supplied by the appliance manufacturer or a
rooftop air inlet cap supplied by the vent
manufacturer. Using any other air inlet cap for
single-unit installations or using a common air
inlet cap for multiple units with insufficient free
area and/or protections from wind and weather
may result in operational problems and the
spillage of flue products. Spillage of flue
products can cause personal injury or death due
to carbon monoxide poisoning.
For single pool heater installations with sidewall air inlet, (see
Figure 18) you must order the sidewall air inlet kit. The part
number for each SVK kit is listed by input size in TABLE–D.
For single pool heater installations with rooftop air inlet (see
Figure 20), you must order the rooftop air inlet kit The part
number for each VDK kit is listed by input size in TABLE-D.
Purchase the flue pipe, rooftop flue termination, and air inlet
pipe locally.
There is no vent kit for combined air supply systems for multiple
pool heaters. Make sure the air inlet cap is properly sized. You
must purchase this cap locally.
Venting of Flue Products
For venting flue products vertically to the outdoors, follow all
requirements in the installation instructions for conventional
venting in this manual. Follow all clearance requirements in
Vertical Vent Termination Clearances and Location, page 10.
A barometric damper is not required in the flue on Vertical
DirectAire™ installations if the draft is within the negative
0.04 to 0.08 inches w.c. required for proper operation. If the
draft exceeds this range, install a barometric damper.
T–C
* The SVK kits include a DV box adapter and sidewall air inlet cap. The
VDK kits include a DV box adapter and a rooftop air inlet cap. See note on
page 12 concerning DV box adapter.
3. Sidewall Venting
IMPORTANT: Before installing a venting system,
follow all venting clearances and requirements
found in the Venting, General Information
section, page 10.
This option uses a powered vent assembly which pulls the flue
products out of the stack. This fan generates a negative draft at
the pool heater. Combustion air is drawn from the mechanical
room (see Combustion and Ventilation Air, page 7).
Figure 21 – Sidewall Venting Installation with an Induced
Draft Fan and Sidewall Vent Cap
Installation and Service Manual
17
Input Horizontal Vertical
Btu/hr Kit* Kit*
500,000 SVK3047 VDK3026
650,000 SVK3048 VDK3027
750,000 SVK3048 VDK3027
990,000 SVK3040 VDK3023
1,260,000 SVK3041 VDK3024
1,440,000 SVK3041 VDK3024
1,800,000 SVK3041 VDK3024
2,070,000 SVK3041 VDK3024
TABLE-D
DirectAire™ Kits