Yazaki CH-K50 - User Manual

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GAS-FIRED DOUBLE-EFFECT

ABSORPTION CHILLER-HEATER

This product is a gas-fired absorption unit which provides chilled water for cooling or

hot water for heating in central plant type air conditioning systems. Units with nominal

refrigeration capacities of 30, 40, 50, 60, 80, and 100 tons are complete with operating

and safety controls.

When this equipment is correctly applied, installed in accordance with Yazaki

INSTALLATION INSTRUCTIONS, and properly maintained, it can provide many years

of trouble-free operation.

CONTENTS

GENERAL Page

 ABSORPTION PRINCIPLE 2

 COOLING OPERATION 2

 HEATING OPERATION 3

CONTROLS

 GENERAL INFORMATION 4

 CONTROL ADJUSTMENTS 6

OPERATION

 COOLING 7

 HEATING 7

 SAFETY CONTROLS 7

 REMOTE CONTROL 7

 PRECAUTIONS 7

MAINTENANCE Page

 GENERAL INFORMATION 8

 ROUTINE MAINTENANCE 8

 MAINTENANCE INTERVALS 8

 EVACUATION OVERVIEW 8

 CHEMICAL MAINTENANCE 9

 WINTER SHUTDOWN 10

 TROUBLESHOOTING 10

 WATER QUALITY 11

 ERROR CODES 11

 STARTUP & MAINTENANCE

DATA SHEET 13

WARRANTY

 YAZAKI LIMITED EXPRESS

WARRANTY 14

OPERATING INSTRUCTIONS

CH-K30, 40, 50, 60, 80, 100

Questions and Answers

M
mgilbertAug 9, 2025
What to do if Yazaki CH-K50 Heater does not operate?
- J
  jonesmaryAug 9, 2025
  If the Yazaki Heater does not operate, there might be several reasons. First, check the LED for the Power indication on the Control Panel. If it is not illuminated, examine the main power disconnect, fuses, and breakers. Also, the solution pump might not be running. Check the THRP overload switch and the GP temperature. The solution pump may remain off until the GP temperature rises above 190°F (88°C). Finally, if the WTO temperature is above the set point, the unit may have shut down normally. To force operation, turn off power to the chiller-heater for 10 seconds, and then restore power. The chiller-heater should start up if the WTO sensor reading is above the set point.
V
Victor ScottAug 28, 2025
What to do if Yazaki Heater is not running but WTO temperature is above set point?
- D
  donald15Aug 28, 2025
  If the Yazaki Heater is not running but the WTO temperature is above set point, it may not indicate a problem. If the chilled water loop has reached the desired set point, the unit will shut down until the WTO sensor reads a temperature 3.6°F (2°C) above the set point temperature. To force operation, turn off power to the chiller-heater, leave power off for 10 seconds, and then restore power. The chiller-heater should start up if the WTO sensor reading is above the set point.
J
Jennifer MyersNov 17, 2025
Why does my Yazaki Heater have poor cooling capacity?
- L
  Lisa PenaNov 17, 2025
  If your Yazaki Heater has poor cooling capacity, several factors could be responsible. Start by checking for poor vacuum and evacuate the machine per normal maintenance procedure; a leak check may also be necessary. High inlet cooling water temperature can also be a cause, so inspect the cooling tower fan and fluid level. Low cooling water flow rate is another possibility; check the cooling tower sump and cooling water circuit strainers. Condenser/Absorber fouling or scale buildup can also reduce cooling capacity, so check the cooling water circuit strainers and consider a chemical de-scaling procedure. Finally, if everything appears normal but the leaving chilled water temperature is too high, it could be that the load of the chilled water circuit exceeds the capacity of the chiller-heate...

Summary

General Information and Operation

Absorption Principle Overview

Explains the fundamental working principle of the absorption cycle using lithium bromide and water.

Cooling Operation Details

Details the process of generating chilled water using the absorption cycle.

Heating Operation Cycle

Maintenance Procedures

Routine Maintenance Schedule

Maintenance Task Intervals

Evacuation Procedure Overview

Explains the importance of maintaining vacuum levels and the basic procedure for evacuation.

Troubleshooting and Water Quality

Troubleshooting Common Issues

Provides common symptoms and their potential causes and remedies for unit operation issues.

Water Quality Standards

Error Code Diagnosis

Lists various error codes, their descriptions, notes, and reset types for diagnosing issues.

Warranty Information

Yazaki Limited Express Warranty Terms

Outlines the terms, conditions, disclaimers, and exclusions of the limited express warranty.

Yazaki CH-K50 Specifications

General

Brand	Yazaki
Model	CH-K50
Category	Heater
Language	English

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