State Industries ROOFTOP SRT80 120NE - Manual (Page 17)

17
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 and automatic gas shutoff
devices for hot water supply systems, ANSI Z21.22.
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.
FIGURE 35
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. When used with a separate storage tank, the
circulation may be either by gravity or by means of circulating pump.
When a circulating pump is used, it is important to note that the
flow rate should be slow so that there will be a minimum of
turbulence inside the heater.
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.
Water heater damage due to installation in a closed system is not
covered by the limited warranty. The solution is to install a thermal
expansion tank between the check valve and the water heater.
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.
3. This unit may never be connected to any existing heating
system or component(s) previously used with non-potable
water heating appliance.
4. When the system requires water for space heating at
temperatures higher than required for domestic water
purposes, a tempering valve must be installed. Please refer
to installation diagrams on pages 29 through 33 in back of
manual for suggested piping arrangements.
WATER HEATER WIRING
IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE APPLIANCE
MUST BE REPLACED, IT MUST BE REPLACED WITH 105C WIRE OR
ITS EQUIVALENT, EXCEPT IN THE BURNER HOUSING. IN THIS CASE
USE 200°C WIRE.
THE COMPUTER CONTROL REQUIRES A SOURCE OF STABLE
CLEAN ELECTRICITY FOR PROPER OPERATION. INSTALLING
THE HEATER ON A BRANCH CIRCUIT THAT HAS ELECTRONIC
NOISE, IS SUBJECT TO FLUCTUATIONS IN VOLTAGE LEVEL OR
HAS AN APPLIANCE WHICH GENERATES EMF OF RFI
INTERFERENCE CAN CAUSE THE CONTROLLER TO
MALFUNCTION. A HIGH QUALITY POWER CONDITIONER MUST
BE INSTALLED IF THE ABOVE CONDITIONS EXIST.
MALFUNCTIONS CAUSED BY A POOR ELECTRICAL SUPPLY ARE
NOT COVERED UNDER YOUR WARRANTY.
CAUTION
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN
SERVICING CONTROLS. WIRING ERRORS CAN CAUSE
IMPROPER AND DANGEROUS OPERATION.
CAUTION
VERIFY PROPER OPERATION AFTER SERVICING UNIT.
The controller is wired to the heater. The model and rating
plate provides the electrical information needed to size the
complete heater branch supply.
All electrical work must be installed in accordance with the
National Electrical Code and local requirements.
When installed, the appliance must be electrically grounded in
accordance with local codes or, in the absence of local codes,
with the National Electrical Code, NFPA 70.
NOTE: This controller is polarity sensitive. If the hot and
neutral supply voltage is reversed, the controller will not
sense flame. Verify polarity before connecting the unit.