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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
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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
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Installation, Operation and Maintenance Guide
To Hot Water Source
Mixing Valve
G3800LF Series Thermostatic Mixing Valves
Required Piping Method
Required when hot water must be circulated to a thermostatic mixing valve that is a substantial distance from the hot water
source. Recommended hot water inlet temperature is 135°F (57°C).
Cold Supply
Hot Supply
Hot Inlet Cold Inlet
Hot Inlet
Cold Inlet
Hot Supply
Cold Supply
To Hot Water Source
Adjustment
Screw
Primary Thermostatic
G3800LF G3850LF
This unit must be cycled each time the emergency equipment is inspected (See ANSI Z358.1, Maintenance and Training Section).
1. Set the thermostatic mixing valve to full hot. (primary
thermostatic mixing valve on the G3850LF)
2. Activate emergency equipment and allow temperature to
reach set point.
3. Turn (primary) thermostatic mixing valve to full cold and
wait ten seconds.
4. Turn (primary) thermostatic mixing valve to full hot and wait
ten seconds.
5. Verify outlet temperature does not exceed 90°F (32°C).
6. Turn (primary) thermostatic mixing valve to full cold and
wait ten seconds.
7. If necessary, adjust high temperature limit stop (see page
2). Then set (primary) mixing valve to desired operating
temperature and deactivate emergency equipment.
The G3850LF Redundant Thermostatic Mixing Valve has been factory set at 90°F (32°C). This set point can be adjusted with a 3/8” wrench
(see above). Twisting the adjustment screw clockwise will increase the temperature. Maximum set point is 100°F (38°C).
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
rev. 0116 / © 2015 Guardian Equipment
3
Page 4
To Dismantle Valve:
Elongated Holes
(nearest the check nut)
Pointer Set
Screw
Coil Sleeve
Stud
Flange Packing
and Cover Screws
Pointer Rod
with Gear
Ball
Socket
Driving
Ball
Pointer
Friction
Spring
Cover
Elongated Holes
(nearest the check nut)
Pointer Set
Screw
Coil Sleeve
Stud
Flange Packing
and Cover Screws
Pointer Rod
with Gear
Ball
Socket
Driving
Ball
Pointer
Friction
Spring
Cover
Check Nut
Port Sleeve
Thimble
Port Sleeve
Nut
Shut o hot and cold water supplies to valve. Loosen set
screw. Remove snap cap, pointer screw, washer, pointer and
friction spring (see Figure 1). Remove cover screws and cover
(thermostat and gears are attached to cover).
When reassembling, insert ange packing into valve body and
replace cover and cover screws. Then replace friction spring,
pointer, washer, screw, and snap cap.
After replacing parts, pointer must be reset. Refer to page 2
instructions “To Reset Adjustable High Temperature Stop.”
To Clean Port Sleeve Assembly:
Screw (twist) the check nut away from valve body towards port
sleeve assembly. Then twist port sleeve nut away from port
sleeve assembly (towards valve body) to release port sleeve
and thimble (Figure 2).
Clean with non-corrosive agent and soft cloth. DO NOT
USE ABRASIVES. Wash parts thoroughly after cleaning and
reassemble.
Install port sleeve with elongated holes nearest the check
nut and tighten port sleeve nut against port sleeve assembly.
DO NOT OVERIGHTEN. Tighten check nut against valve body.
Driving ball on thermostat group should then be inserted into
ball socket for nal reassembly (Figure 1).
Installation, Operation and Maintenance Guide
G3800LF Series Thermostatic Mixing Valves
Figure 1
Figure 2
To Replace Pointer Rod With Gear:
Loosen set screw and remove snap cap, pointer screw, washer,
pointer and friction spring (Figure 1). Remove cover screws
and cover. Then remove coil sleeve stud and thermostat group.
Replace pointer rod with gear, and reassemble.
To Replace or Clean Thermostat Group:
See “To Replace Pointer Rod with Gear” (above) to disassemble
valve. Clean any collected deposits from thermostatic coil with
brush and non-corrosive cleaning solution.
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
rev. 0116 / © 2015 Guardian Equipment
4
Page 5
Thermostatic Mixing Valve Parts
Installation, Operation and Maintenance Guide
G3800LF Series Thermostatic Mixing Valves
21 3 4 6 875 9 10 11 12 13 14
Checkstop Parts
22
23
16
171718
24 25
20
26
15
RK3800A
Repair Kit
Repair Kits
16
18
2119
RK3800B
Checkstop Kit
Repair kit Includes parts to repair both hot and cold checkstops
26
25
20
Lockable Pointer (sux “LTR”)
Item Part No. Description
1 57L Snap Cap
2 TM29/29A Pointer Screw
3 TM25C Pointer
4 30 Friction Spring
5 615 Dial Plate
6 TM25D Stop Screw
TM-36
Pointer Set Screw
Notes:
1. After installing new parts, the
adjustable high temperature limit
stop must be reset (see page 2).
7 TM16 Cover Screws (6)
8 TM15B/50 Cover
9 TM21/50 Flange Packing
10 TGM2/50 Thermostat Group
11 TGM1/50M Port Sleeve Assembly
12 TM3/50M Port Sleeve Nut Assembly
13 TM8 Coil Sleeve Stud
14 TM28A Pointer Rod
2. All G3800LF and G3850LF valves
are furnished with lockable
pointers.
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
Item Part No. Description
15 MU5A O-Ring
16 03 Lower Stem & Packing
011 Spring (Hot Side)
17
015 Spring (Cold Side)
18 MU5A O-Ring
19 MU4A Upper Stem
20 05 Packing
21 02 Bonnet
22 04/50 Swivel
23 09/50 Swivel Nut
24 06 Strainer Cap
25 014 Cap Packing
26 013 Screen
rev. 0116 / © 2015 Guardian Equipment
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Installation, Operation and Maintenance Guide
System Pressure Drop (PSI)
25
Flow Rate (GPM)
G3800LF Series Thermostatic Mixing Valves
Flow Capacities
MODEL IN OUT
G3800LF 1" 1 1/4"
G3850LF 1 1/4" 1 1/4"
50
G3800LF/G3850LF
37.5
12.5
0
18 24 30 36 42 48 54 60
MINIMUM
FLOW
(GPM)
L/MIN 0.3 0.7 1.0 1.4 1.7 2.1 2.4 2.8 3.1 BAR
3 20 20 25 30 33 35 38 43 50 56 GPM
11 76 76 95 114 125 132 144 163 189 212 L/MIN
3 20 20 25 30 33 35 38 43 50 56 GPM
11 76 76 95 114 125 132 144 163 189 212 L/MIN
INTERNAL
COLD WATER
BYPASS
MINIMUM
5 10 15 20 25 30 35 40 45 PSI
SYSTEM PRESSURE DROP
MAXIMUM FLOW CAPACITY
CAUTION: ALL THERMOSTATIC MIXING VALVES HAVE
LIMITATIONS. THEY WILL NOT PROVIDE THE DESIRED
ACCURACY OUTSIDE OF THEIR FLOW CAPACITY
RANGE. CONSULT THE CAPACITY CHART AND DO NOT
OVERSIZE. MINIMUM FLOW MUST BE NO LESS THAN
SHOWN ABOVE.
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.
Limited Warranty
Guardian Equipment warrants the original purchaser that its products will be free from defects in materials and workmanship under normal usage conditions,
and when properly installed and maintained according to manufacturer's instructions for a period of two years from date of shipment. During the warranty
period, Guardian Equipment will (at its discretion) repair or replace any product or part thereof, which shall be returned, freight prepaid to Guardian's factory
and determined by the manufacturer to be defective in materials or workmanship. There are no warranties, expressed or implied, which extend beyond verbiage
contained herein. There are no implied warranties of merchantability or tness for a particular purpose. Guardian Equipment will not be held liable for labor,
incidental or consequential damages. Any alteration or improper installation or improper use of the product will void this limited warranty.
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
rev. 0116 / © 2015 Guardian Equipment
6
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