Reliant FVIR GAS WATER HEATER Informations techniques télécharger pdf (Page 25)

GAS WATER HEATER SIZING GUIDE

Use the following information as a guide to approximate the correct size water heater for the residence:

30 gallon size (21 gallon draw) for one bath residence.•

40 gallon size (28 gallon draw) for two bath residence -or one bath with an automatic clothes washer.•

50 gallon size (35 gallon draw) for three bath residence - or two baths with an automatic clothes washer.•

When a whirlpool tub is part of the home equipment, it is suggested that the water heater storage tank •

capacity be selected based on the needs of the whirlpool tub. This method of tank sizing, will in most cases,

cancel all statements above concerning tank sizing.

High ﬂ ow or multiple shower head installations must be sized for at least a 20 minute draw.•

Table 2:

Tub Capacity to

Overﬂ ow Outlet at:

80 gal. 90 gal. 100 gal. 110 gal. 120 gal. 130 gal. 140 gal. 150 gal.

(120ºF Water) Min. Stored

Water Capacity**

80 gal. 90 gal. 100 gal. 110 gal. 120 gal. 130 gal. 140 gal. 150 gal.

(140ºF Water*) Min.

Stored Water Capacity**

65 gal. 71 gal. 80 gal. 89 gal. 98 gal. 108 gal. 117 gal. 125 gal.

(@ 160ºF Water*) Min.

Stored Water Capacity**

54 gal. 59 gal. 66 gal. 74 gal. 82 gal. 90 gal. 97 gal. 104 gal.

*A thermostatic mixing valve set for a maximum temperature of 120° F is recommended to be installed to prevent a scalding

hazard.

**Based on tub water temperature of 105º

Note: Because the desired ﬁ ll time is normally 10 minutes, recovery capacity is not used for this calculation. All water used

is supplied by storage.

NOTE: The draw efﬁ ciency of a gas or electric water heater storage tank is considered to be 70%.

6” (152.4 mm)

MAXIMUM AIR GAP

A C

A. Water at the draft hood is water vapor which has

condensed out of the combustion products. This is

caused by a problem in the vent.

B. *Condensation may be seen on pipes in humid

weather or pipe connections may be leaking.

C. *The anode rod ﬁ tting may be leaking.

D. Small amounts of water from temperature-pressure

relief valve may be due to thermal expansion or

high water pressure in your area.

E. *The temperature-pressure relief valve may be

leaking at the tank ﬁ tting.

F. Water from a drain valve may be due to the valve

being slightly opened.

G. *The drain valve may be leaking at the tank ﬁ tting.

H. Combustion products contain water vapor which

can condense on the cooler surfaces of the tank.

Droplets form and drip onto the burner or run on

the ﬂ oor. This is common at the time of start-up

after installation and when incoming water is cold.

I. Water in the water heater bottom or on the ﬂ oor

may be from condensation, loose connections, or

the relief valve. DO NOT replace the water heater

until a full inspection of all possible water sources

is made and necessary corrective steps taken.

Leakage from other appliances, water lines, or ground

seepage should also be checked.

* To check where threaded portion enters tank,

insert cotton swab between jacket opening and

ﬁ tting. If cotton is wet, follow draining instructions

in the “Draining the Water Heater” section and then

remove ﬁ tting. Put pipe dope or Teﬂ on

tape on the

threads and replace. When you are ﬁ nished, follow

the steps in “Filling the Water Heater” section.

LEAKAGE CHECKPOINTS

Figure 29

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Reliant FVIR GAS WATER HEATER Informations techniques Page 25

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