Cambridge Engineering S Series User Manual

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S-TM7-02-18

S400-S3200 REV. F

S-SERIES

DIRECT GAS-FIRED

INDUSTRIAL BLOW-THRU

®

SPACE HEATER

TECHNICAL MANUAL

mWARNING:

Improper installation, adjustment, alteration, service or maintenance can cause property dam-

age, injury or death. Read the installation, operating, and maintenance instructions thoroughly

before installing or servicing this equipment.

FOR YOUR SAFETY

The use and storage of gasoline or other flammable vapors and liquids in open containers in

the vicinity of this appliance is hazardous.

FOR YOUR SAFETY

If you smell gas:

1. Open windows.

2. Don’t touch electrical switches.

3. Extinguish any open flame.

4. Immediately call your gas supplier.

®

90.1

ASHRAE

ASHRAE

COMPLIANT

COMPLIANT

Made in the USA

®

Table of Contents

Questions and Answers:

R
rodriguezzacharyAug 1, 2025
How to troubleshoot no blower operation in Cambridge Engineering Heater?
- T
  Teresa HowardAug 1, 2025
  If the Cambridge Engineering Heater blower isn't running, first ensure the unit isn't in reset by turning it OFF and then ON again. Check that the heater disconnect is ON. Verify the mode selector switch on the RCS is in the correct mode and adjust the operating thermostat if needed. Make sure the blower service switch is in the REMOTE position. Examine the control and Class 2 transformers, checking the disconnect, supply fusing, and supply voltage. Also, inspect the multi-functional PC board, checking the voltage in the RCS. Other potential causes include the damper motor (adjust damper stroke), motor protection/starter/motor (check primary power source or replace starter), blower (replace bearings), or belts (tighten belts).
S
snealAug 5, 2025
What to do if Cambridge Engineering S Series Heater modulating valve does not modulate and runs on continuous high fire?
- M
  mboydAug 5, 2025
  If the Cambridge Engineering Heater's modulating valve is stuck on continuous high fire, try reinstalling the wire on the amplifier (A1014, A1044, or AD1014). You might also need to clean the Discharge Air Temperature Sampling Tube for the discharge temperature sensor (TS114J or TS144). For Series 44 models, replace the space temperature selector if resistance exceeds specified values (7,000 ? for T244; 5,500 ? for TS244; or 2,250 ? for TD244). For Series 14, recalibrate or replace the space thermostat. If using a remote heat adjust (TD114 or CEI 4175-0-960), replace it if resistance between terminals 1 and 3 is less than 6,000 ?.
L
Laura WalshAug 9, 2025
What to do if Cambridge Engineering S Series Heater blower runs, but there is no heat and flame safety relay locks out?
- T
  Tyler PetersonAug 9, 2025
  If the blower runs but the Cambridge Engineering Heater doesn't heat and the flame safety relay locks out, start by checking the igniter current. Also, check the gas supply for low or no gas pressure using the high or low gas pressure switches. Inspect the gas valve, verifying the FSR output to the R1 relay during ignition. Finally, adjust the minimum fire on the modulating valve.
J
John RogersAug 14, 2025
Why Cambridge Engineering Heater blower runs, unit heats, but will not cycle off?
- H
  Helen MahoneyAug 14, 2025
  If the Cambridge Engineering Heater blower runs, the unit heats, but it won't cycle off, first check the thermistor wiring and consider replacing the thermistor for the operating thermostat. Ensure the burner service switch is in the REMOTE position. Inspect the auxiliary circuit wiring and contacts. Consider reviewing the control system's operational characteristics to ensure proper understanding.
R
Randy MontgomeryAug 18, 2025
What to do if Cambridge Engineering S Series Heater modulating valve does not modulate and runs on continuous low fire?
- J
  James DawsonAug 18, 2025
  If the Cambridge Engineering Heater's modulating valve is stuck on continuous low fire, start by checking for a short in the modulating valve coil using the Class 2 transformer. If the valve coil resistance is less than 40 ? or greater than 85 ?, replace it. With the wire removed from terminal 3 of the amplifier, replace the amplifier if the valve voltage doesn't exceed 18 Volts DC. Replace the discharge temperature sensor (TS114J or TS144) if the resistance at terminals 1 and 2 on TS114J is less than 8,000 ?. Also, replace the space temperature selector (T244 or TS244/TD244) if the resistance is less than 5,000 ? for the T244, 3,500 ? for the S244, or 1,950 ? for the TD244.

Cambridge Engineering S Series Specifications

General

Brand	Cambridge Engineering
Model	S Series
Category	Heater
Language	English

Summary

S-Series Technical Manual Overview

Limited Warranty Information

Details on the limited warranty terms and conditions provided with the product.

Hazard Summary and Safety Precautions

Hazard Identification and Warnings

Explanation of warning symbols and general safety advice.

Specific Installation Safety Guidelines

Safety considerations for installations in aircraft hangars, parking garages, and car washes.

System Overview and Heater Configuration

Accessory Identification

Identification of system accessories and parts.

Component Identification

List and definitions of various system components.

Heater Operation

Explanation of how the heater functions in response to space temperature.

Heater Configuration

Illustrates the internal layout and key components of the heater.

Installation Instructions

Uncrating and Mounting Location

Procedures for unpacking and selecting a suitable location for the heater.

Roof Top Mounting: Curb / Stand / Rail

Detailed instructions for mounting the heater on a roof curb, stand, or rail.

Roof Top / Thru Wall Mounting: Stand / Rail

Instructions for mounting the heater on a roof or through a wall using stand and rail.

Under Roof Mounting: Curb

Guidelines for installing the heater under a roof using a mounting curb.

Roof Top Mounting

Specific steps and considerations for roof top installation.

Thru Wall Mounting

Detailed instructions for installing the heater through a building wall.

Roof Top / Thru Wall Mounting

Combined instructions for roof top or through-wall installations.

Under Roof Mounting

Procedures for installing the heater within a building's roof structure.

Vertical Indoor Mounting

Instructions for installing the heater vertically inside a building.

Vertical Outdoor Mounting

Guidelines for installing the heater vertically on an exterior wall.

Rain Hood Inlet Skirt Installation

Steps for installing the rain hood inlet skirt for proper air intake.

Unit Inlet Skirt Installation

Steps for installing the unit inlet skirt for proper air intake.

Gas Piping Installation

Guidelines and requirements for connecting the gas supply to the heater.

Electrical Wiring Installation

Instructions for connecting the electrical power and control wiring.

Start-Up and Calibration Procedures

Detailed Start-Up Procedure

Step-by-step guide for initial equipment start-up and verification.

Calibration Procedures by Control System

Instructions for calibrating different control systems like EDL, EDSM, and EDR.

Operating Instructions

Heater Operating Sequence

Flowchart detailing the sequence of operations for heating and ventilation modes.

Electronic Thermostat (OET) Operation

Guide to setting temperatures and operating the OET for temperature control.

TSS Controller Operation and Programming

Instructions for programming the TSS controller for heating and ventilation schedules.

Maintenance Instructions

Lubrication and Filter Servicing

Guidelines for blower/motor lubrication and filter cleaning or replacement.

Gas Valve Cleaning Procedures

Steps for cleaning and maintaining ASCO gas valves for optimal performance.

Troubleshooting Instructions

General Troubleshooting Guide

A comprehensive table of problems, causes, and corrective actions.

Specific Troubleshooting Scenarios

Detailed troubleshooting for common issues like blower, heat, and flame safety problems.

Damper Motor Replacement and Adjustment

Procedures for servicing the damper motor, including replacement and adjustment.

Reference Materials

Electrical Control Enclosure Isometric Drawing

Diagram showing the layout of components within the electrical control enclosure.

Electrical Wiring Diagrams

Schematics illustrating the electrical connections for different control systems.

Electrical Connection Diagram

Overview diagram of electrical connections between the heater and remote station.

Gas Train Drawings and Configurations

Diagrams illustrating gas train components and configurations for different models.

Individual Component Descriptions

Remote Control Stations and Systems

Descriptions of remote control stations and various temperature control systems.

Heater Components and Functionality

Detailed explanations of key heater components like airflow switches and motors.

Standards Compliance Information

Overview and Purpose of ASHRAE Standard 90.1

Introduction to ASHRAE Standard 90.1 and its applicability to commercial buildings.

Cambridge Heater Compliance Requirements

Specific requirements for Cambridge heaters to comply with ASHRAE Standard 90.1.

Maintenance Log

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