Cambridge Engineering S950 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:

M
Mark McgrathAug 5, 2025
How to troubleshoot no blower operation in Cambridge Engineering S950?
- J
  jwheelerAug 5, 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).
K
Kimberly PotterAug 9, 2025
What to do if Cambridge Engineering S950 modulating valve does not modulate and runs on continuous high fire?
- M
  Mitchell PhillipsAug 9, 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 ?.
A
Alejandro HamiltonAug 13, 2025
What to do if Cambridge Engineering S950 Heater blower runs, but there is no heat and flame safety relay locks out?
- L
  Lisa WeaverAug 13, 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.
D
Danielle SilvaAug 18, 2025
Why Cambridge Engineering S950 blower runs, unit heats, but will not cycle off?
- R
  Rebecca SmithAug 18, 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.

Cambridge Engineering S950 Specifications

General

Model	S950
Category	Heater
Input BTU/hr	950, 000
Fuel Type	Natural Gas or Propane
Phase	3

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