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System connections – John Wood SERIES 100 User Manual

Page 13

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13

DISCONNECT THE APPLIANCE AND ITS MANUAL GAS SHUTOFF

VALVE FROM THE GAS SUPPLY PIPING SYSTEM DURING ANY

SUPPLY PRESSURE TESTING EXCEEDING 1/2 PSIG (3.45Kpa). GAS

SUPPLY LINE MUST BE CAPPED WHEN DISCONNECTED FROM THE

HEATER. FOR TEST PRESSURES OF 1/2 PSIG (3.45Kpa) OR LESS, THE

APPLIANCE NEED NOT BE DISCONNECTED, BUT MUST BE ISOLATED

FROM THE SUPPLY PRESSURE TEST BY CLOSING THE MANUAL GAS

SHUTOFF VALVE.

BEFORE PLACING THE HEATER IN OPERATION, CHECK FOR GAS

LEAKAGE. USE SOAP AND WATER SOLUTION OR OTHER MATERIAL

ACCEPTABLE FOR THE PURPOSE OF LOCATING GAS LEAKS. DO NOT

USE MATCHES, CANDLES, FLAME OR OTHER SOURCES OF IGNITION

FOR THIS PURPOSE.

PURGING

Gas line purging is required with new piping or systems in which air has

entered.

CAUTION

PURGING SHOULD BE PERFORMED BY PERSONS EXPERIENCED IN

THIS TYPE OF GAS SERVICE. TO AVOID RISK OF FIRE OR EXPLOSION,

PURGE DISCHARGE MUST NOT ENTER CONFINED AREAS OR

SPACES WHERE IGNITION CAN OCCUR. THE AREA MUST BE WELL

VENTILATED AND ALL SOURCES OF IGNITION MUST BE INACTIVATED

OR REMOVED.

GAS METER SIZE - CITY GASES ONLY

Be sure that the gas meter has sufficient capacity to supply the full rated gas

input of the water heater as well as the requirements of all other gas fired

equipment supplied by the meter. If the gas meter is too small, ask the gas

company to install a larger meter having adequate capacity.

GAS PRESSURE REGULATION

Main line gas pressure to the water heater should be between a maximum

10.5" (2.59Kpa) W.C. (14.0"/3.45Kpa for propane) and a minimum as shown

in Table 4: that is, for Natural Gas, 4.8" (1.18Kpa) W.C. and 8.5" (2.08Kpa) for

Propane Gas. The inlet gas pressure must not exceed the maximum value.

A service regulator must be installed within 10' (305 cm) of unit.

WARNING

FAILURE TO INSTALL A PRESSURE REGULATOR WITHIN 10 FEET OF

THE WATER HEATER CAN RESULT IN LEAKAGE OF FLUE GASES INTO

THE SURROUNDING ROOM. SERIOUS PERSONAL INJURY OR DEATH

COULD RESULT FROM INHALATION OF CARBON MONOXIDE GAS.

GAS VALVES

WARNING

SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO

SHUT OFF, TURN OFF THE MANUAL GAS CONTROL VALVE TO THE

APPLIANCE.

SYSTEM CONNECTIONS

The system installation must conform to these instructions and to the local

code authority having jurisdiction. Good practice requires that all heavy

piping be supported.

THERMOMETERS (Not Supplied)

Thermometers should be obtained and field installed as shown in the

installation diagrams.

Thermometers are installed in the system as a means of detecting the

temperature of the outlet water supply.

RELIEF VALVE

This heater is equipped with an approved temperature and pressure relief

valve. ASME ratings cover pressure relief. CSA ratings cover release rate

with temperature actuation.

FOR SAFE OPERATION OF THE WATER HEATER, THE RELIEF VALVE(S)

MUST NOT BE REMOVED OR PLUGGED.

In addition to the appliance relief valve, each remote storage tank

which may be used in conjunction with this appliance shall also be

installed with a properly sized, rated and approved temperature (ANSI)

and pressure (ASME) relief valve(s). This relief valve shall comply

with the standard for relief valves for hot water supply systems. ANSI

Z21.22-CSA 4.4.

Your local code authority may have other specific relief valve

requirements.

WARNING

THE PURPOSE OF A RELIEF VALVE IS TO AVOID EXCESSIVE

PRESSURE OR TEMPERATURE INTO THE STEAM RANGE, WHICH

MAY CAUSE SCALDING AT FIXTURES, TANK EXPLOSION, SYSTEM

OR HEATER DAMAGE. NO VALVE IS TO BE PLACED BETWEEN THE

RELIEF VALVE AND THE TANK.

A DRAIN LINE MUST BE CONNECTED TO THE RELIEF VALVE TO

DIRECT DISCHARGE TO A SAFE LOCATION TO AVOID SCALDING OR

WATER DAMAGE. THIS LINE MUST NOT BE REDUCED FROM THE

SIZE OF THE VALVE OUTLET AND MUST NOT CONTAIN VALVES OR

RESTRICTIONS, NOR SHOULD IT BE LOCATED IN FREEZING AREAS.

DO NOT THREAD OR CAP THE END OF THIS LINE. RESTRICTED OR

BLOCKED DISCHARGE WILL DEFEAT THE PURPOSE OF THE VALVE

AND IS UNSAFE. THE DISCHARGE LINE SHALL BE INSTALLED TO

ALLOW COMPLETE DRAINAGE OF BOTH THE VALVE AND LINE.

WATER LINE CONNECTIONS

This manual provides detailed installation diagrams (see back section of this

manual) for typical methods of application for the water heaters.

The water heater may be installed by itself, or with a separate storage

tank.

CLOSED SYSTEM

CAUTION

A closed system will exist if a check valve (without bypass), pressure reducing

valve (without bypass), or a water meter (without bypass) is installed in the

cold water line between the water heater and street main (or well).

Excessive pressure may develop causing premature tank failure or

intermittent relief valve operation. This type of failure is not covered

by the limited warranty. An expansion tank or a similar device may be

required in the inlet supply line between the appliance and the meter or

valve to compensate for the thermal expansion of water under supply

pressure.

If a water heater is installed in a closed water system, check local codes

or contact the water supplier or local plumbing inspector on how to control

this situation.

WATER (POTABLE) HEATING AND SPACE HEATING

1. All piping components connected to this unit for space heating

applications shall be suitable for use with potable water.

2. Toxic chemicals, such as those used for boiler treatment, shall

NEVER be introduced into this system.

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