HydroTherm MultiTemp MR-900B User Manual

®
MR SERIES
INSTALLATION
MANUAL AND
REPLACEMENT
PARTS LIST
Modular Gas-Fired Cast
Iron Water Heating Plants
360,000 to 2,400,000
Btuh Input
Applicable For Larger Heating
Plants Using Boiler Banks Of
8-Modules Or Less
NOTE: If shop drawings have not been provided, refer to the Appendices at the rear of this manual for sizing
(breeching, chimney & gas piping) and control system data.
IN UNITED STATES: 260 NORTH ELM ST • WESTFIELD, MA 01085 • (413) 564-5515 • FAX (413) 568-9613
IN CANADA: 5211 CREEKBANK ROAD • MISSISSAUGA, ONT. L4W 1R3 • (905) 625-2991 • FAX (905) 625-6610
SECTION 1: INTRODUCTION
Heating Plant Design............................................2
Code Compliance.................................................2
Heating Plant Shipment........................................2
Heating Plant Dimensions....................................3
SECTION 2: INSTALLING MODULES
Step 1: Planning Ahead........................................4
Step 2: Arranging Heating Plant...........................5
Step 3: Setting & Aligning Modules......................5
SECTION 3: INSTALLING WATER PIPING
Step 1: Planning Ahead........................................6
Step 2: MC Heat Exchangers...............................6
Step 3: Supply & Return Headers........................6
Step 4: Hydronic Components..............................7
Step 5 Hydrotesting The Systems........................8
Combination Heat/Cool Systems........................10
SECTION 4: VENTING THE HEATING PLANT
Step 1: Planning Ahead......................................11
Step 2: Drafthoods & Vent Dampers...................12
Step 3: Vent Connectors & Slip Joints................13
Step 4: Breeching Runs.......................................14
SECTION 5: INSTALLING JACKETS
Jacket Assembly..................................................15
SECTION 6: INSTALLING GAS PIPING
Step 1: Gas Main & Gas Headers.......................16
Step 2: Test Gas Piping.......................................16
SECTION 7: WIRING THE HEATING PLANT
Module Wiring......................................................17
SECTION 8: HEATING PLANT START-UP
Step 1: Planning Ahead......................................19
Step 2: Start-Up & Adjustments..........................19
Step 3: How To Change Orifices.........................21
APPENDICES
A: Breeching/Chimney Sizing..............................22
B: Gas Pipe Sizing..............................................24
C: Control Guidelines..........................................26
D: Field Installation of Vent Damper....................31
Replacement Parts List.......................................32
MRC2-1103
42-9154

HydroTherm MultiTemp MR-900B Specifications

General

Brand	HydroTherm
Model	MultiTemp MR-900B
Category	Boiler
Language	English

Summary

Section 2: Installing Modules

Module Installation Planning

Heating Plant Layout Arrangement

Guidelines for arranging modules in banks, including grouping and clearances for optimal layout.

Module Setting and Alignment

Procedures for positioning, leveling, and aligning modules on the foundation for proper installation.

Section 3: Installing Water Piping

Water Piping Installation Planning

Supply and Return Header Installation

Guidance on installing supply and return headers, including reverse return flow for adequate module flow.

Hydronic Components Installation Guide

Details on installing essential hydronic components like relief valves, indicators, and air separators.

System Hydrotesting Procedure

Section 4: Venting the Heating Plant

Heating Plant Venting Planning

Key considerations for planning the venting system, including breeching and chimney requirements.

Drafthood and Vent Damper Installation

Instructions for installing drafthoods and optional vent dampers on module flue outlets.

Vent Connector and Slip Joint Installation

Breeching Run Installation Guidelines

Procedures for sizing and installing breeching runs, including pitch, tapering, and connection methods.

Section 6: Installing Gas Piping

Gas Main and Header Installation

Guidance on sizing, installing, and supporting gas mains and headers for the heating plant.

Gas Piping Leak Testing

Procedures for testing gas piping for leaks using soap solution before putting the system into service.

Section 7: Wiring the Heating Plant

Heating Plant Wiring and Control Connections

Section 8: Heating Plant Start-Up

Heating Plant Start-Up Planning

Heating Plant Start-Up and Adjustments

Procedures for safely starting the heating plant, purging air, and making initial adjustments for optimal performance.

Changing Gas Burner Orifices