HydroTherm MultiTemp MR-750C 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-750C Specifications

General

Brand	HydroTherm
Model	MultiTemp MR-750C
Category	Boiler
Language	English

Summary

SECTION 1: INTRODUCTION

CODE COMPLIANCE

Requirements for installation codes and standards for safety.

SECTION 2: INSTALLING MODULES

STEP 1: PLANNING AHEAD

Key considerations before installation, including clearances and combustion air.

COMBUSTION AIR REQUIREMENTS

Details on providing adequate air for combustion, crucial for safety.

HEATING PLANT FOUNDATION

Requirements for a stable, fireproof foundation for the heating plant.

SECTION 3: INSTALLING WATER PIPING

FREEZE PROTECTION

SECTION 4: HYDRONIC COMPONENTS

PRESSURE RELIEF VALVES

Installation of pressure relief valves and critical safety warnings.

MANUAL RESET HI-LIMIT

Safety control to shut off all boilers if temperature exceeds setting.

LOW WATER CUTOFF

STEP 5: HYDROTESTING THE SYSTEM

SECTION 4: VENTING THE HEATING PLANT

STEP 1: PLANNING AHEAD

DANGER: CHIMNEY SAFETY

Critical warning about chimney safety standards.

STEP 2: DRAFTHOODS & VENT DAMPERS

SECTION 5: INSTALLING JACKETS

SECTION 6: INSTALLING GAS PIPING

STEP 1: GAS MAIN & GAS HEADERS

Sizing and installation of gas mains and headers.

STEP 2: TEST GAS PIPING

Procedure for testing gas piping for leaks.

DANGER: GAS PIPING TEST

Critical safety warning for gas piping testing.

SECTION 7: WIRING THE HEATING PLANT

DANGER: ELECTRICAL POWER SAFETY

Warning to turn off power before servicing.

GENERAL WIRING GUIDELINES

Requirements for electrical wiring and grounding.

SAFETY DEVICES WIRING

CAUTION: 24 VOLT CONTROLS

Warning about connecting gas valves to line voltage.

SECTION 8: HEATING PLANT START-UP

STEP 1: PLANNING AHEAD

Pre-startup checks for flow direction, leaks, and pump interlocks.

STEP 2: START-UP & ADJUSTMENTS

Procedures for safely starting and adjusting the heating plant.

WARNING: COMBUSTIBLE MATERIALS

Critical safety warning about keeping combustibles away.

CAUTION: YELLOW BURNING FLAMES

Warning about poor combustion indicated by yellow flames.

CHECK GAS INPUT RATE

SAFETY AND OPERATING CONTROLS VERIFICATION

Checking operation of hi-limits and low water cutoffs.

HOW TO CHANGE ORIFICES

FINAL INSPECTION AND APPROVAL

APPENDIX A: BREECHING/CHIMNEY SIZING

BREECHING LENGTH AND DIAMETER GUIDELINES

CHIMNEY REQUIREMENTS AND SIZING

APPENDIX B: GAS PIPE SIZING

GAS PIPE SIZING METHODOLOGY

How to determine gas pipe sizes for natural gas and propane.

GAS PIPE SIZING TABLES

GAS PIPE CAPACITY TABLES

APPENDIX C: CONTROL GUIDELINES

LEVEL II CONTROL

LEVEL III CONTROL

CONTROL FUNCTIONS AND DESCRIPTIONS

SPACE HEATING CONTROL WIRING DIAGRAMS

COMBINATION HEATING CONTROL WIRING DIAGRAMS

APPENDIX D: FIELD INSTALLATION OF VENT DAMPER

INSTALLATION PROCEDURE

WIRING PROCEDURE

MODEL R SERIES REPLACEMENT PARTS LIST