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POWERVT@WATER HEATER
Typical Construction
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7
17
4
5
Figure 19-1
1. Cold water inlet
2.
Hot water outlet
3.
Drain
4.
Condensate drain
5.
I-beam skid
6.
Flue outlet
7.
Gas inlet
8.
Induced draft blower motor
9.
Circulating pump
10.
Temperature & pressure relief valve
11.
Electronic LWCO probe
12.
Control enclosure with sWitch(es) & fuse(s)
13.
Handhole access
14.
Burner
15.
Manual reset temperature limiting device
16.
Operating control
17.
Drip leg
18.
Electronic LWCO control (optional)
19.
Temperature & pressure gauges (optional)
20.
Alarm bell
21.
Differential air switch
22.
Passive FGR duct (factory installed for Low
NOx
units)
23.
Passive FGR duct
(field
installed for Low
NOx
units)
IMPORTANT: Clearance to unprotected combustible material must be 8" minimum at top, sides
and rear, and 24" minimum in front. Recommended access for service is 18" at sides and rear and
24" in front.
PV500-19 04-2005
2
Section 19
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