Raypak 1005 Water Piping, General, Relief Valve Installation and Piping, Hydrostatic Test

WARNING: Care must be taken to ensure that the equipment room is not under negative pressure conditions.

3.For heaters not using a barometric damper in the vent system, and when air supply is provided by natural air flow from outdoors for a power burner and there is no draft regulator, drafthood or similar flue gas dilution device installed in the same space, in addition to the opening for ventilation air required in 1., there shall be a permanent air sup- ply opening(s) having a total cross-sectional area of not less than 1 in.2 for each 30,000 BTUH (74 mm2 per kW) of total rated input of the burner(s), and the location of the opening(s) shall not inter- fere with the intended purpose of the opening(s) for ventilation air referred to in 1. This opening(s) can be ducted to a point not more than 18 in. (450 mm) nor less than 6 in. (152 mm) above the floor level. The duct can also “goose neck” through the roof. The duct is preferred to be straight down 18 in. (450 mm) from the floor, but not near piping.

4.Refer to the B149 Installation Code for additional information.

Water Piping

General

The heater should be located so that any water leaks will not cause damage to the adjacent area or struc- tures.

CAUTION: This heater must be installed with a Primary-Secondary piping arrangement for the integral pumping system to function properly.

NOTE: Minimum pipe size for the heater inlet/outlet connections is dependent on the equivalent length of piping between the load loop and the heater loop, the operating conditions and the size of the heater. See Table G on page 16.

Relief Valve Installation and Piping

WARNING: Pressure relief valve discharge piping must be piped near the floor and close to a drain to eliminate the potential of severe burns. Do not pipe to any area where freezing could occur. Refer to local codes.

The heater is supplied with a Section IV “HV” stamped relief valve sized for the full input of the unit and a “UV” stamped relief valve to protect the section VIII second- ary heat exchanger. The relief valve assembly is shipped loose and must be mounted directly to the heater outlet. No valve shall be installed between the heater and the relief valves. The relief valves shall be mounted with their spindles vertical (see Fig. 1, 2 and 3 on page 6). Relief valve discharge piping shall pro- vide no less than the cross sectional area of the relief valve outlet and must be routed to a safe point of dis- charge. Installation must comply with all national, state and local codes.

WARNING: The pressure relief valve must be installed at the outlet of the heater. No valve is permitted to be installed between the heater and the relief valve.

Temperature & Pressure Gauge

The temperature and pressure gauge is shipped loose for field installation and must be installed within 12 inches of the boiler outlet (if possible) in an easily readable location. Installation must comply with ASME Section IV as well as all applicable national, state and local codes.

Hydrostatic Test

Unlike many types of heaters, this heater does not re- quire hydrostatic testing prior to being placed in operation. The heat exchanger has already been fac- tory-tested and is rated for 160 psi operating pressure. However, Raypak does recommend hydrostatic test- ing of the piping connections to the heater and the rest of the system prior to operation. This is particularly true for hydronic systems using expensive glycol- based anti-freeze. Raypak recommends conducting the hydrostatic test before connecting gas piping or electrical supply.

14