Caution, Maintenance – John Wood Superflue Power Vent (before FVIR technology) User Manual

Page 18

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Keep the area around the heater clear

and unobstructed.

Keep safety your first priority. Take all

precautions to avoid creating a fire,

health or safety hazard.

Although this heater has been specifically approved for certain clearances to combustible materials, any objects

placed in that space will reduce air circulation and increase the risk of fire.

CAUTION

WARNING

VIII) COMBINATION POTABLE WATER

HEATING AND SPACE HEATING

(COMBO)

This section serves as a guide for the installation and use of
“Combo” heating systems utilizing a domestic water heater which
has been specifically approved for such use. It is written for those
knowledgeable in the required trades and professionals involved
in the design and installation of Combo Heating Systems.

It is the responsibility of the installer/ designer to fol-

low all applicable codes to ensure the effectiveness

and safety of the installation.

Caution

READ BEFORE PROCEEDING

The following requirements must be met for the installation of

Combo Heating Systems:

1.All components used for the distribution of water in the heating

loop must be suitable for potable water. These include all piping,

fittings, solder and fluxes, pumps for circulation of water, valves,

etc.

2.The water heater must not be connected to a hydronic heat-

ing system that has been used previously.

3.No boiler treatment chemicals of any kind shall be introduced

into the system.

4.The Combo System components must be selected and sized to

meet and maintain the total calculated demands for both domes-

tic service hot water and space heating requirement. The sizing

and installation must be performed in accordance with good engi-

neering practice such as ASHRAE Handbooks, HRAI, Hydronics

Institute Manuals, CGA B149, NFPA 54, ANSI Z223.1, CSA F280,

National/Provincial Building Codes, CSA C22.1, ANSI/NFPA 70,

CSA B51 and/or codes having jurisdiction.

5.The air handler (fan coil) and/or the circulating pump in a base-

board hydronic loop will require a dedicated 120V circuit. This

must be provided and identified for this purpose.

6.All piping between the water heater and the air handler or

hydronic baseboard loop must be adequately insulated to reduce

heat loss.

7.If the local jurisdiction requires a back-flow preventer in the cold

water line, an expansion tank of adequate size must be installed.

8.To reduce the scald hazard potential, a mixing valve must be

installed.
INSTALLATION
The heating mode may be one of the following options:

A- A fan coil/air handler (figure 16).

B- A hydronic baseboard (finned tube) loop/ In floor heating (fig-

ure 17).
The following is a list of requirements for the installation of the

heating loop to the water heater.
a)Install shut-off valves and unions so that the water heater can

be isolated from the heating module should servicing of the water

heater become necessary.
b)Install a drain valve at the lowest point of the heating loop so

that water can be drained from the heating module without affect-

ing the water heater.
c)If the air handler does not have a venting means at the highest

point of the piping arrangement, install an air bleed at the highest

point of the plumbing arrangement.

MAINTENANCE

The installation and maintenance of the water heater must follow
all of the instructions described in sections I to VII of this manual.
Heater failure that is a result of the heating system is not covered
by warranty.

Figure 16

Figure 17

BASEBOARD PIPING OF
GSW POWER-VENT
GAS-FIRED WATER HEATER
(SIDE-TAPPED)

SIDE-TAPPED PIPING OF GSW
POWER-VENT GAS-FIRED WATER
HEATER (INTERNAL OR EXTERNAL
CIRCULATOR)

IF USED CHECK VALVE
REQUIRE EXPANSION TANK

(OPTIONAL)

RETURN

SUPPLY

WATER HEATER

HOSE BIB

CIRCULATOR

FLOW CONTROL

EXTERNAL
CIRCULATOR

INTERNAL
CIRCULATOR

EXPANSION TANK

CHECK
VALVE

DRAIN/
PURGE
VALVE

MIXING-
VALVE

8 in TO 12 in

MAX.

8 in TO 12 in

MAX.

HOT W

TER

HOUSE FIXTURE

HYDRONIC BASEBOARDS

(SERIES CONNECTED SHOWN)

COLD
SUPPLY

HOT
OUTLET

COLD
INLET

HOT W

TER

HOUSE FIXTURE

HOT
OUTLET

AIR HANDLER

COLD
INLET