Guardian Equipment G3800LF User Manual
Installation, Operation and Maintenance Guide
G3800LF Series Thermostatic Mixing Valves
Note: Please provide valve serial number (stamped on cover of valve) when ordering parts.
Angle
Checkstop
Hot Water
Inlet
Tempered
Water Outlet
Angle
Checkstop
Cold Water
Inlet
Hot Water
Inlet
Tempered
Water Outlet
Cold Water
Inlet
Redundant
Thermostatic
Mixing Valve
Primary
Thermostatic
Mixing Valve
Angle
Checkstop
Angle
Checkstop
G3800LF
G3850LF
Installation
1. Install valve in a location where it may be easily cleaned,
adjusted or repaired.
2. Inlets are clearly marked on valve body casting. Connect hot
water to inlet marked “HOT” and cold water to inlet marked
“COLD.”
3. Included angle checkstops must be installed on both supply
lines.
IMPORTANT: THESE SYSTEMS ARE DESIGNED TO PROVIDE MIXED
WATER FROM 60 TO 90°F 15 TO 32°C FOR EMERGENCY EQUIPMENT
APPLICATIONS ONLY IN ACCORDANCE WITH ASSE 1071.
Note: This is a control system which must be cleaned and maintained regularly (see Maintenance Guide and Record card included with valve shipment).
4. Use solder or pipe cement sparingly. Flush supply pipes
before connecting valve. Flush outlet pipe and valve once
valve is connected.
Maximum operating pressure is 125 PSI (860 KPA) for hot and cold
water. Maximum hot to cold water pressure dierential is 5%.
Note: Should piping be exposed to excessive hot or cold conditions,
it may be necessary to insulate piping to prevent freezing or
scalding water.
Guardian Equipment
1140 N North Branch St
Chicago, IL 60642
312 447 8100 telephone
312 447 8101 facsimile
gesafety.com
rev. 0116 / © 2015 Guardian Equipment
1
Adjustment and Service
Guardian thermostatic mixing valves may be easily cleaned,
adjusted and repaired. Servicing may be possible without
disconnecting valve.
To Reset Adjustable High Temperature Limit Stop:
Stop Screw
Set Screw
Pointer
1. Loosen set screw. Remove snap cap, pointer screw,
washer, and pointer.
2. Activate emergency xture.
3. Temporarily place pointer on pointer rod and turn handle
to the left, allowing cold water to ow. Then, slowly
adjust handle to the right until the required maximum
temperature is reached. Note: Temperatures above 90°F
are not recommended. Consult a medical advisor for correct
temperature settings.
4. Once maximum temperature has been reached, remove
pointer and replace on pointer rod such that its right
edge rests against the stop screw located on the right
side of the cover.
5. Tighten set screw and replace washer, pointer screw, and
snap cap. Hold a thermometer under water ow to verify
maximum temperature has been set appropriately. Then
set desired operating temperature.
Snap Cap
Installation, Operation and Maintenance Guide
G3800LF Series Thermostatic Mixing Valves
Note: Thermostatic water mixing valves are regulating mechanisms
which must be regularly maintained to provide best performance.
Local water quality and usage conditions dictate cleaning frequency.
(See Maintenance Guide and Record card included with valve
shipment and reference ANSI Z358.1)
WARNING: THIS THERMOSTATIC MIXING VALVE HAS
AN ADJUSTABLE HIGH TEMPERATURE LIMIT STOP
WHICH MUST BE CHECKED. IF TEMPERATURE IS
TOO HIGH, THE INSTALLER MUST RESET THIS STOP
IMMEDIATELY. ALWAYS CHECK THE TEMPERATURE
OF THE MIXED WATER WHEN THE LEVEL
HANDLE IS TURNED TO FULL HOT. THE WATER
TEMPERATURE OF EACH INDEPENDENT OUTPUT
MUST BE CHECKED IF USING A COMBINATION
UNIT. EXCESSIVE HOT WATER TEMPERATURE IS
DANGEROUS AND MAY CAUSE SCALDING.
THE HIGH TEMPERATURE LIMIT STOP IS FACTORY
SET AT APPROXIMATELY 90°F 32°C WITH AN
INCOMING HOT WATER SUPPLY TEMPERATURE
OF 135°F 57°C. IF THE INCOMING HOT WATER
IS HIGHER THAN 135°F 57°C, THE VALVE
WHEN TURNED TO FULL HOT WILL DELIVER
WATER IN EXCESS OF 90°F 32°C AND THE HIGH
TEMPERATURE LIMIT STOP MUST BE RESET.
Troubleshooting
Symptom Component Type Part No. Description
Leak at pointer rod. Packings and Gaskets
Leak between valve cover and body. Packings and Gaskets
Valve outlet temperature will not mix
consistently.
After cleaning or replacing port
sleeve assembly, valve will not hold
temperature.
Hot water bypass into cold line. Checkstops
Port Sleeve Assembly
Thermostat Group
MU-5A
TM-21/50
TGM-1/50M or
RK3800A
TGM-2/50 or
RK3800A
RK3800B
Leak at checkstop bonnet. Checkstops
If installed on a circulated hot water system, verify the valve is piped according to Required Piping Method on page 3.
See page 5 for complete parts breakdown and parts kits.
Note: This is a control system which must be cleaned and maintained regularly (see Maintenance Guide and Record card included with valve shipment).
Guardian Equipment
1140 N North Branch St
Chicago, IL 60642
312 447 8100 telephone
312 447 8101 facsimile
gesafety.com
O-Ring
Flange Packing
Port Sleeve Assembly or
Repair Kit
Thermostat Group or
Repair Kit
Checkstop KitSupplies cannot be shut o completely. Checkstops
rev. 0116 / © 2015 Guardian Equipment
2
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