Raypak 300, 850 operating instructions Venting, Cascade Follower Pump and Sensor Wiring, General

Cascade Follower Pump

and Sensor Wiring

1.Connect the boiler pump to the terminals marked

BOILER PUMP NEUT (#6), BOILER PUMP HOT (#5), and GROUND (#4) at the rear terminal strip.

2.If you are using an indirect fired water tank con- nected directly to the follower boiler, connect the pump for it to the terminals marked DHW PUMP NEUT (#8), DHW PUMP HOT (#7), and GROUND (#3) at the rear terminal strip.

If you desire, an alarm bell or light can be connected to the alarm contacts of the follower boiler. Optionally, the normally-closed alarm contact may be used to turn a device off if the boiler goes into lockout mode. The alarm contacts are rated 5 amps at 120 VAC.

To connect an alarm device, connect the power for the device to the ALARM COM terminal. Connect the alarm device hot wire to the ALARM NO terminal. Connect the neutral or return of the alarm device to the neutral or return of the power for the alarm device.

To connect a device that should be powered off during a boiler lockout condition, follow the same instructions as above except use the ALARM NC terminal rather than the ALARM NO terminal.

Note that in a cascade system the alarm output of the boiler addressed as #1 will also be active if the master boiler has a lockout condition. The alarm output of boil- ers addressed as 2–7 will only sound if a lockout condition occurs on that specific boiler.

CAUTION: Proper installation of flue venting is critical for the safe and efficient operation of the boiler.

Venting

General

Appliance Categories

Heaters are divided into four categories based on the pressure produced in the exhaust and the likelihood of condensate production in the vent.

Category I – A heater which operates with a non-pos- itive vent static pressure and with a vent gas temperature that avoids excessive condensate pro- duction in the vent.

Category II – A heater which operates with a non-pos- itive vent static pressure and with a vent gas temperature that may cause excessive condensate production in the vent.

Category III – A heater which operates with a positive vent pressure and with a vent gas temperature that avoids excessive condensate production in the vent.

Category IV – A heater which operates with a positive vent pressure and with a vent gas temperature that may cause excessive condensate production in the vent.

See Table K for appliance category requirements. NOTE: For additional information on appliance categorization, see the ANSI Z21.13 Standard and the NFGC (U.S.), or B149 (Canada), or applicable provisions of local building codes.

CAUTION: Condensate drains for the vent piping are required for installations of the XFyre. Follow vent manufacturer instructions for installation and location of condensate drains in the vent. Condensate drain traps must be primed with water to prevent gas flue leak and must be routed to an appropriate container for neutralization before dis- posal, as required by local codes.

WARNING: Contact the manufacturer of the vent material if there is any question about the appliance categorization and suitability of a vent material for application on a Category IV vent system. Using improper venting materials can result in personal injury, death or property damage.

CAUTION: Raypak recommends the use of a con- densate neutralizer, sales order option Z-12.

Use only approved PVC or CPVC vent materials (in Canada, ULC-S636 approved plastic materials must be used) or special gas vent pipes listed for use with Category IV gas burning heaters, such as the AL29-4C stainless steel vents offered by Heat Fab Inc. (800- 772-0739), Protech System, Inc. (800-766-3473), Z-Flex (800-654-5600) or American Metal Products (800-423-4270). Pipe joints must be positively sealed. Follow the vent manufacturer’s installation instructions carefully. Vent installations shall be in accordance with Part 7, Venting of Equipment, of the NFGC, ANSI Z223.1/NFPA 54, Section 7, Venting Systems and Air Supply for Appliances, of the B149 Code, or applicable provisions of the local building codes.

23