Yazaki CH-K40 - 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

J
Jonathan WarrenAug 8, 2025
What to do if Yazaki Heater does not operate?
- A
  Andrea HolmesAug 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.
B
Brittany GrayAug 28, 2025
What to do if Yazaki CH-K40 is not running but WTO temperature is above set point?
- C
  Christopher GatesAug 29, 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.
K
kelseyonealNov 18, 2025
Why does my Yazaki CH-K40 have poor cooling capacity?
- B
  Betty CoxNov 18, 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

CONTROL SYSTEM OVERVIEW

Control Panel and Operation Logic

TEMPERATURE CONTROL ADJUSTMENTS

Adjusting Chilled Water Temperature

Explains adjustments for leaving chilled water temperature and dead bands.

Adjusting Hot Water Temperature

Explains adjustments for leaving hot water temperature and dead bands.

OPERATING MODES AND SAFETY

Engaging Cooling Mode

Engaging Heating Mode

Safety Controls and Error Handling

Details safety limits, error code display, and reset procedures.

MAINTENANCE GUIDELINES

Routine Maintenance Tasks

Scheduled Maintenance Intervals

Vacuum Maintenance Importance

Highlights the importance of vacuum and service valve identification for evacuation.

CHEMICAL AND VACUUM PROCEDURES

Evacuation Safety and Setup

Details critical precautions and the assembly setup for evacuation.

SHUTDOWN AND TROUBLESHOOTING STEPS

Troubleshooting: Unit Not Starting

Lists common causes and remedies when the chiller-heater fails to operate.

Troubleshooting: Low Cooling Performance

Lists common causes and remedies for reduced cooling capacity.

WATER QUALITY AND ERROR CODES

Error Code Definitions

Lists and explains various error codes, their descriptions, and reset types.

Yazaki CH-K40 Specifications

General

Brand	Yazaki
Model	CH-K40
Category	Heater
Language	English

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