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HTP MC80 User Manual

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120 Braley Rd. P.O. Box 429 East Freetown, MA 02717-0429 www.htproducts.com
LP-171 Rev. 3.3.15
MC Series Gas-Fired
Circulating Heater
INSTALLATION
START-UP
MAINTENANCE
PARTS
Models
MC50 / MC80
MC99 / MC120
When installing models manufactured after July 7, 2008, you will notice additional selections on the control installer menu that will not
apply to this unit. DO NOT CHANGE THESE FACTORY SETTINGS. Refer to the Control Program Reference Chart within this manual
for selections that apply to this model.
This manual must be used by a qualified installer/service technician. Read all instructions in this manual before installing. Perform steps
in the given order. Failure to comply could result in substantial property damage, severe personal injury, or death.
NOTICE: HTP reserves the right to make product changes or updates without notice and will not be held liable for typographical errors
in literature.
NOTE TO CONSUMER: PLEASE KEEP ALL INSTRUCTIONS FOR FUTURE REFERENCE.

Table of Contents

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HTP MC80 Specifications

General IconGeneral
BrandHTP
ModelMC80
CategoryHeater
LanguageEnglish

Summary

Safety Information

Gas Leak Detection and Response

Critical steps to take in case of gas detection.

Installer Guidelines

Installation Compliance Standards

List of codes and standards for proper installation.

PART 1 - GENERAL SAFETY INFORMATION

Safety Precautions

Essential safety measures before operating or installing.

PART 3 - PREPARE HEATER LOCATION

Heater Location Considerations

Factors to consider before selecting the installation site.

PART 7 - VENTING, COMBUSTION AIR, AND CONDENSATE REMOVAL

Venting and Air General Requirements

General guidelines for venting, combustion air, and condensate.

Improper Combustion and Gas Safety

Improper Combustion Issues

Critical information on maintaining proper combustion.

Heater Installation Details

Exhaust and Intake Pipe Requirements

Requirements for the heater's venting system.

Venting and Air Quality

Preventing Combustion Air Contamination

How to avoid contaminants in combustion air.

Removing Existing Heaters

Procedures for safely removing an old heater.

Heater Piping Details

Relief Valve Installation

Installation and operation requirements for the relief valve.

Venting Materials and Canadian Requirements

Approved Venting Materials

Approved materials for venting and intake piping systems.

Exhaust and Intake Pipe Location

Determining Vent/Intake Terminal Location

Determining the correct location for vent and intake terminals.

Condensate Management

Condensate Piping Location

Selecting appropriate locations for condensate piping.

Vent Pipe Sizing and Runs

Exhaust Vent & Intake Pipe Sizing

Guidelines for sizing vent and intake pipes.

Exhaust and Intake Pipe Installation

Exhaust/Intake Pipe Installation Steps

Detailed instructions for installing exhaust and intake piping.

PART 8 - GAS PIPING

Gas Connection Procedure

Connecting the gas supply line to the heater.

Gas Piping and Pressure

Gas Piping Installation

Proper routing and installation of gas piping.

Checking Inlet Gas Pressure

Procedure to check the incoming gas pressure.

PART 9 - FIELD WIRING

Wiring Compliance

Codes and regulations for electrical installation.

Field Wiring Overview

General guidelines for field wiring connections.

Line Voltage Wiring

How to connect the 120 VAC power supply.

PART 11 – START-UP PREPARATION

Water Chemistry Check and Control

Ensuring proper water chemistry for system longevity.

System Preparation Procedures

Fill and Test Water System

Steps for filling and testing the water system.

Pre-Startup Checks

Gas Leak Checks

Safety checks for gas leaks before and during operation.

PART 12 – START-UP PROCEDURE

PART 14 – TROUBLESHOOTING

Error Code Identification

Identifying and rectifying error codes shown on the display.

Heater Error Codes

Understanding error codes and suggested corrective actions.

Heater Fault Diagnosis

Recognizing fault indications and their remedies.

PART 15 – MAINTENANCE

Service Technician Maintenance Schedule

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