User Guide

ManualsBrandsTekmar ManualsHeating SuppliesSwitching Relay - 4 Zones w/ Priority

D - 11/16

304P

11/16

Zoning

Replaces: 10/16

Switching Relay 304P

Installation & Operation Manual

• RoomResponse

signal

• Compatible with all low voltage thermostats

• Unlimited zone expansion

• Zone priority

• Priority override

• Pump exercising

• Post purge

•

LED for each zone, priority, end switch and RoomResponse

• Away signal shared between tekmar thermostats

• Four ground screws

• Top, bottom and back conduit knockouts

• Fuses protect transformers and pumps

• Two spare fuses included

• CSA approved

Introduction

The Switching Relay

304

P connects up to four thermostats and operates circulators to provide heating to a zoned hydronic

heating system. Zone 1 has optional priority over zones 2 through 4 and can be used to provide heat to an indirect

domestic hot water tank. The 304P includes optional exercising to prevent circulator seizure when not in use, and optional

post purge operation of the last operating zone to maximize energy savings. The 304P provides a RoomResponse

signal to modulating-condensing boilers to optimize comfort while improving boiler efficiency.

RoomResponse

Power

Priority

Zone 1 Zone 2 Zone 3 Zone 4

Switching Relay 304P

Four Zones with Priority

H3020A

Features

Summary of content (12 pages)

PAGE 1
Installation & Operation Manual 304P_D Switching Relay 304P 11/16 Zoning Replaces: 10/16 Introduction The Switching Relay 304P connects up to four thermostats and operates circulators to provide heating to a zoned hydronic heating system. Zone 1 has optional priority over zones 2 through 4 and can be used to provide heat to an indirect domestic hot water tank.
PAGE 2
Table of Contents Important Safety Information .............................................2 Installation .........................................................................3 Preparation .................................................................... 3 Location ......................................................................... 3 Installing the Enclosure ................................................. 3 Application 304P–1........................................................
PAGE 3
Radio Frequency Interference The installer must ensure that this control and its wiring are isolated and/or shielded from strong sources of electromagnetic noise. Conversely, this Class B digital apparatus complies with Part 15 of the FCC Rules and meets all requirements of the Canadian Interference-Causing Equipment Regulations.
PAGE 4
Application 304P–1 The Switching Relay 304P operates the circulators for four heating zones when the corresponding thermostat calls for heat. The boiler is fired whenever a zone calls for heat.
PAGE 5
Application 304P–2 The Switching Relay 304P operates four heating zone circulators when the corresponding thermostat calls for heat. Zone 1 heats a domestic hot water tank. When priority is selected, zones 2 through 4 shut off when zone 1 is heating. The boiler is fired when there is a call for heat.
PAGE 6
Application 304P–3 Two Switching Relay 304P's operate eight heating zone circulators. The two controls are connected together using an expansion bus wire. The master 304P fires the boiler when any zone calls for heat. If priority is selected, zones 2 through 8 shut off when zone 1 is calling for heat.
PAGE 7
User Interface - Indicator LED Power • On when 115 V (ac) is applied. • Off when power disconnected or transformer fuse is blown. Priority • On when zone 1 has priority over zones 2 to 4. RoomResponseTM • On when modulating condensing boiler is operating below maximum setting. Zone 1 • On when thermostat 1 calls for heat. Zones 2 to 4 • On when the corresponding thermostat calls for heat. • Off during priority operation. • Off when corresponding thermostat stops calling for heat.
PAGE 8
RoomResponseTM Signal The RoomResponseTM signal adjusts the temperature of a modulating condensing boiler that accepts a 0-10 V(dc) or 4-20 mA input. It works by continually adjusting boiler water temperatures to the lowest possible value to meet comfort without wasting energy. This is done by monitoring each thermostat's on and off time pattern and determines the ideal water temperature for each zone.
PAGE 9
Aerco AM Series -------------------------------- – Camus Modulating MicoFlame ------------------ 22 23 + – 304P – + Aerco AM + 5 6 – + Camus Micoflame 304P • No changes to the boiler are required. • Change control to mode 6 in the control parameters. Bosch Greenstar ------------------------------- Heat Transfer Products Elite--------------------- – 9 10 + – 304P – + 16 17 + + 304P Bosch ICM – HTP Elite • Install the Bosch ICM as per the directions.
PAGE 10
Laars Mascot FT -------------------------------- – NTI Trinity FireTube ------------------------------ 16 17 + + – – Laars Mascot FT 304P X + X R CH1 + – 3 4 5 5 24Vac I/O 304P Sensor I/O • No changes to the boiler are required. NTI Trinity Fire Tube Lochinvar Knight -------------------------------- • Enter boiler password.
PAGE 11
Raypak MVB and XTherm ----------------------- Weil-McLain Evergreen -------------------------- – – + X + X – 304P 13 14 17 18 Raypak MVB or XTherm 304P • Set boiler PIM DIP switch 2 to Down. • Set boiler PIM DIP switch 5 to Up. + • • • • • • 5 6 – + Weil-McLain Evergreen P15 Use Local Priority 1 for DHW tank heating. Use Local Priority 2 for the RoomResponseTM signal. Set Local Priority 2 Supply Min to 60°F. Set Local Priority 2 Supply Max to 180°F.
PAGE 12
Technical Data Switching Relay 304P Four Zones with Priority Literature Control Packaged weight Dimensions Enclosure Approvals Ambient conditions Power supply Transformer Fuses Pump relays Boiler XX end switch DHW end switch Mod boiler output 304P_C, 304P_D, 304_J Microprocessor control. This is not a safety (limit) control. 5.0 lb.