SeaLand Heat Pump Vacuum Pump User Guide

M-Series  
Vacuum Pump  
OWNER’S MANUAL  
Dometic Corporation  
13128 State Rt 226, P.O. Box 38  
Big Prairie, Ohio 44611-0038 USA  
SeaLand Product Hotline 1-800-321-9886  
(8:00 a.m. - 5:00 p.m. ET)  
 
Electrical Wiring  
It is imperative that adequate wire size and proper over-current protection (fuse or circuit breaker) sizes are used.  
The following chart can be used as a guideline. Refer to chart on page 10 for solenoid/relay information.  
BREAKER/FUSE SIZE  
PUMP MOTOR WIRE SIZE  
PUMP VOLTAGE  
1/2 HP  
50 amp  
25 amp  
20 amp  
10 amp  
5 amp  
1/2 HP  
3/4 HP  
75 amp  
40 amp  
30 amp  
15 amp  
8 amp  
3/4 HP  
12 VDC  
24 VDC  
32 VDC  
6 to 8 ga.  
3 to 4 ga.  
6 to 8 ga.  
8 to 10 ga.  
10 to 12 ga.  
12 to 14 ga.  
8 to 10 ga.  
10 to 12 ga.  
12 to 14 ga.  
14 to 16 ga.  
115 VAC (1 phase)  
230 VAC (1 phase)  
MAINTENANCE  
ELECTRICAL CAUTION: DISCONNECT POWER SUPPLY TO PUMP BEFORE SERVICING UNIT. FOLLOW  
PROPER LOCK-OUT/TAG-OUT PROCEDURES.  
Maintenance intervals and normal parts replacement vary widely depending on numerous factors such as  
frequency of system use and quality of flush water, etc. The chart below is intended strictly as a general  
guideline. Owner discretion and consideration of actual usage must be the first basis for determining proper  
maintenance levels.  
Approximate Maintenance Level  
Procedure  
Maintenance Procedure  
A
B
C
D
E
F
See instructions  
Every two years  
Every two years  
Every two years  
Every two years  
If needed  
Change Oil  
Inspect Diaphragm  
Inspect Rod Bushing  
Inspect Eccentric Pin  
Duckbill Valve Replacement  
Speed Reducer Replacement  
Motor Replacement  
G
If needed  
A. CHANGE OIL  
Fig. 1  
The gear reducer oil should be changed after first 50 hours, thereafter  
every 200 hours. Drain and fill with 90W oil or equivalent to bottom of  
oil level inspection hole (opposite of output shaft). Grease the rod  
bushing every 200 hours. (See item 9 on Pump Parts List)  
B. DIAPHRAGM REPLACEMENT  
CAUTION: KEEP HANDS AND ALL OTHER EXTREMITIES AWAY FROM ROD AND DIAPHRAGM. FLUSH  
THE PUMPWITH CLEAN WATERAND DISINFECTANT BEFORE SERVICING.  
When replacing a diaphragm, be sure to follow maintenance instructions B-D.  
IMPORTANT: Incorrect alignments and clearances may cause pre-  
mature diaphragm failure. It is important to insure that proper  
alignment is achieved between the eccentric pin and the dia-  
Fig. 2  
phragm rod. Make sure that clearances are correct between the  
diaphragm rod and the eccentric (Fig. 6) and also between the  
eccentric and the gear reducer hub (Fig. 7).  
To Remove the Diaphragm:  
1. Remove pump cover (not used in SaniService applications).  
2. Jog motor until rod is at bottom dead center position.  
NOTE: See manual rotation method on page 4.  
3. Close the maintenance valves (if installed) in the inlet and outlet  
piping.  
3
 
4. Disconnect electrical source to motor, following lock-out/tag-out procedure.  
5. Remove the six (6) 5/16" fasteners around the circumference of the pump top.  
6. Carefully remove the pump top from the pump body.  
7. Turn the pump top upside down to expose the diaphragm and rod bolt. (See Fig. 3)  
8. Remove the rod bolt.  
9. Pull the diaphragm away from the rod.  
10. Clean the old silicone adhesive from the top and bottom diaphragm plate and bottom of the rod.  
11. Clean the old grease (if any) from the diaphragm sealing groove in the pump body.  
To Install the Diaphragm:  
1. Apply bead of silicone adhesive around the rod bolt hole on both sides of the diaphragm and let cure until the  
silicone skins over.  
2. Assemble the diaphragm, upper and lower plates to the rod.  
3. Apply silicone grease to the  
diaphragm sealing groove in the  
pump body.  
Fig. 3  
Fig. 4  
4. Carefully install the pump top and  
diaphragm into the pump body.  
Make certain the diaphragm is  
properly seated in the groove in  
the pump body.  
5. Tighten the six (6) 5/16"  
mounting bolts in a criss-cross  
pattern as shown. (See Fig. 4)  
Manual Rotation Method:  
1. Remove motor from speed (gear) reducer.  
Fig. 5  
2. Wedge a large flat-bladed screwdriver or pry bar into hollow input  
shaft keyway of speed reducer and rotate until rod is at bottom  
dead center. (See Fig. 5)  
C. ROD BUSHING INSPECTION AND REPLACEMENT  
NOTE: The rod and bearing must be replaced as an assembly  
because the bearing is pressed into the rod using special  
equipment.  
Fig. 6  
To Inspect:  
1. Follow steps 1 through 11 in “To Remove the Diaphragm” on  
page 3.  
2. Remove the hex nuts from the eccentric pin and slide off the old  
rod.  
3. Inspect the bushing in the rod for wear by measuring the bushing  
diameter. If worn beyond the service limits, replace the rod and  
bushing.  
New: 0.625" [15.88mm]  
Service Limit: 0.630” [16mm]  
To Install:  
1. Lubricate the bushing and eccentric pin with anti-seize compound.  
2. Slide rod onto the eccentric pin. (See Fig. 6)  
4
 
3. Install and adjust first hex nut for proper bushing clearance of 0.020" [.50mm].  
4. Hold adjustment nut from turning and install and tighten the lock nut.  
5. Recheck bushing clearance.  
IMPORTANT: INADEQUATE CLEARANCE OR LOOSE LOCK NUT WILL CAUSE THE ECCENTRIC TO BIND,  
RESULTING IN PUMP STALLINGAND PREMATURE BUSHING WEAR.  
6. Follow steps 1 through 5 in “To Install the Diaphragm” on page 4.  
D. ECCENTRIC PIN INSPECTION AND REPLACEMENT  
To Inspect:  
Fig. 7  
1. Follow steps 1 and 2 in the rod bushing inspection and replacement  
section.  
2. Inspect the eccentric pin diameter for wear. If worn beyond theservice  
limit replace the eccentric.  
New: 0.6248" [15.87mm]  
Service Limit: 0.622" [15.80mm]  
3. Remove the eccentric by loosening the pinch bolt and jamming a flat-  
blade screwdriver into the pinch bolt slot.  
To Install:  
1. Slide the new eccentric onto the output shaft until the output shaft is  
flush with the end of the eccentric. Make certain the key is in the keyway  
and flush with the end of the eccentric. (See Fig. 7)  
2. Slide eccentric in or out to adjust eccentric to speed (gear) reducer  
clearance of 0.075" [1.9mm], tighten pinch bolt and check clearance.  
3. Follow step 3 (To Inspect) and steps 1 through 6 (To Install) in Rod  
Bushing Inspection and Replacement section. (See Fig. 7)  
IMPORTANT: IF OUTPUT SHAFT IS NOT FLUSH WITH ECCENTRIC AFTER CLEARANCE, ADJUSTMENT  
WILL BE NECESSARY. LOOSEN THE OUTPUT SHAFT SET SCREWS AND SLIDE THE OUTPUT SHAFT IN  
OR OUTACCORDINGLY.  
E. DUCKBILL VALVE INSPECTION AND REPLACEMENT  
To Inspect:  
1. Flush the pump with fresh water and disinfectant.  
2. Close the maintenance valves (if installed) in the inlet and outlet piping.  
3. Turn off/disconnect electrical source to the pump motor.  
4. Disassemble the inlet/outlet flanges, elbows, and valve housings. (See Fig. 8)  
5. Remove the four (4) duckbill valves. Replace all valves if any appear to be: swollen, out of shape, torn, scuffed,  
slit or show any other sign of wear.  
CAUTION: ORDER VALVES MADE OF EPDM (PART NUMBER: 348702) FORALLSEWAGEAPPLICATIONS.  
ORDER VALVES MADE OF NITRILE (PART NUMBER: 342684) FOR OIL-CONTAMINATED WATER  
APPLICATIONS.  
Fig. 8  
To Install:  
1. Insert the two inlet valves pointing toward the pump  
body. (See Fig. 8)  
2. Insert the two (2) outlet valves pointing away from  
the pump body. (See Fig. 8)  
5
 
F. SPEED (GEAR) REDUCER REPLACEMENT  
To Remove:  
Fig. 9  
1. Turn off electrical power to pump and remove pump cover (not  
supplied on some models).  
2. Remove the motor from the reducer. (See Section G)  
3. Loosen output shaft set screws.  
4. Remove the four (4) 3/8" bolts that secure the reducer to the pump  
top using a 9/16" socket and ratchet.  
5. Slide the reducer off the output shaft.  
To Replace:  
1. Grease the output shaft, keyway and key.  
2. Loosen the output shaft set screws and slide the reducer onto  
the output shaft.  
3. Insert the four (4) 3/8" bolts and lock washers through the pump  
and into the reducer. Tighten securely.  
4. See step 2 (To Install) in “Eccentric Pin Inspection and Replacement” (page 5).  
G. MOTOR REPLACEMENT  
To Remove:  
1. Turn off electrical power to pump.  
2. Remove access plate from wiring junction box on motor.  
3. Unhook wiring from motor leads.  
4. Remove the four (4) motor mounting bolts securing the motor to the speed (gear) reducer.  
5. Pull the motor away from the gear reducer. (See Fig. 10)  
IMPORTANT: OVER TIME THE MOTOR SHAFT MAY SEIZE TO THE SPEED (GEAR) REDUCER SHAFT.  
IF THIS HAPPENS REFER TO THE NEXT STEP.  
6. The speed (gear) reducer motor mounting flange has two threaded holes for forcing the motor off. Use two of  
the motor mounting bolts for this application. (See Fig. 10)  
To Install:  
1. Lubricate motor shaft with an anti-seize compound.  
2. Insert key into keyway on motor shaft.  
3. Carefully slide the motor into the speed (gear) reducer.  
4. Install the four bolts and washers and tighten.  
5. Wire motor leads to input wires by following instructions on data plate riveted to motor housing.  
Low voltage  
High voltage  
=
=
115VAC  
220/230VAC  
Fig. 10  
6
 
TROUBLESHOOTING  
WARNING  
Before attempting to open or service the pump:  
1. If possible, flush pump with clean water and disinfectant.  
2. Allow motor to cool if overheated.  
3. Disconnect power supply to pump before servicing unit.  
Follow proper lock-out/tag-out procedures.  
Possible Cause  
Problem  
Service instructions  
a. Correct leak.  
1. Pump fails to prime.  
a. Air leak(s) in suction (inlet) line.  
b. Suction (inlet) line collapsed.  
b. Replace suction line.  
c. Clean or replace valves (4 required).  
c. Suction (inlet) or discharge (outlet)  
check valves clogged or worn out.  
d. Replace diaphragm.  
e. Clean suction line.  
f. Tighten bolts.  
d. Torn or broken diaphragm.  
e. Suction line clogged.  
f. Diaphragm or flange bolts loose.  
a. Air in suction line.  
a. Correct leak.  
2. Pump stops or has  
reduced flow.  
b. Replace suction line.  
c. Replace diaphragm.  
d. Clean suction or discharge line.  
b. Suction line collapsed.  
c. Torn or broken diaphragm.  
d. Clogged suction or discharge line.  
e. Check installation and correct as  
required.  
e. Suction lift or discharge lift (head)  
too high.  
f. Clean or replace valves (4 required).  
f. Suction or discharge valves in pump  
clogged or defective.  
a. Dilute if possible.  
3. Excessive current draw  
requires too much  
power.  
a. Liquid solution too thick.  
b. Clean or replace valves (2 required).  
b. Discharge valves in pump clogged.  
c. Check installation and correct as  
required.  
c. Excessive suction or discharge lifts  
(head).  
a. Tighten bolts.  
b. Check oil level.  
a. Pump, gear reducer or motor loose.  
b. Gear reducer low on oil.  
4. Excessive noise.  
7
 
DIMENSIONALSPECIFICATIONS  
WIRING DIAGRAMS  
M-Series Vacuum Pump Wiring Schematic  
(VacuFlush System)  
NOTE: Vacuum tank pressure switches are wired in parallel for multiple toilet installations.  
Wire to B connections only.  
8
 
PARTS LIST  
Speed (Gear) Reducer  
PART NUMBER  
Item  
Description  
Qty  
*30:1  
*20:1  
1
2
310537  
310538  
Seal and Gasket Kit  
Bearing and Race Kit  
1
1
3
4
5
342812  
342814  
342813  
342815  
Input Shaft 920 MDSN *(SPECIFY RATIO, SERIAL/MODEL NUMBERS TO ORDER)  
Worm Gear 920 MDSN *(SPECIFY RATIO, SERIAL/MODEL NUMBERS TO ORDER)  
Output Shaft Cover (800519)  
1
1
1
342816  
6
7
342817  
342818  
Output Shaft *(SPECIFY RATIO, SERIAL/MODEL NUMBERS TO ORDER)  
Input Shaft Cap (800261)  
1
1
341792  
8
9
10  
11  
12  
13  
342820  
342821  
342822  
342823  
341797  
340704  
5/16"-18 x 7/8" Hex Head Screw-SS  
5/16" Split Ring Lock Washer SS  
Gear Reducer Housing 920 MDSN (790509)  
5/16"-18 x 1-1/4" Hex Head Screw SS  
MotorAdapter Flange (800254)  
12  
16  
1
4
1
Retaining Ring (10141)  
1
9
 
PARTS LIST  
M-Series Vacuum Pump  
3/4HP  
345831  
346900  
346530  
342479  
342478  
Parts Below Not Shown  
12VDC SOLENOID  
1/2HP  
345831  
346900  
346530  
341431  
342478  
24VDC SOLENOID  
32VDC SOLENOID  
115VAC RELAY 50/60 HZ  
220VAC RELAY 50/60 HZ  
10  
 
PARTS LIST  
PART NUMBER  
ITEM  
DESCRIPTION  
QTY  
1/2HP 3/4HP  
3/8"-16 x 1/2" Hex Head Screw  
.875" x .406" x .042" Flat Washer  
Stainless Steel Cover  
Gear Reducer 920MDSN 30:1 ratio, 15 GPM  
Gear Reducer 920MDSN 20:1 ratio, 20 GPM  
5" Output Shaft  
5/16"-18 x 1-1/4" Socket Head Screw  
M Pump Eccentric  
1/4" Output Shaft Key  
M Pump Diaphragm Rod  
5/8"-18 Thin Series Nut  
5/16"-18 x 1-3/4" Hex Head Screw  
M Pump Top Closure  
1
2
3
4
342469  
341598  
342422  
342466  
342770  
342454  
340689  
640286  
340720  
342413  
342472  
342759  
342404  
342405  
342419  
342406  
346604  
346615  
346795  
340687  
342459  
342675  
342757  
640321  
348702  
342684  
342456  
342449  
342402  
342403  
342467  
342688  
342462  
342675  
342756  
640321  
342468  
340688  
342471  
4
4
1
1
5
6
7
8
1
1
1
1
1
2
6
1
1
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
Upper Diaphragm Plate  
M Pump Diaphragm  
Bottom Diaphragm Plate  
1/4"-20 Hex Nut  
1
1
22  
22  
22  
16  
1
1/4" External Tooth Lock Washer  
.625" x .281" x .050" Flat Washer  
1/4"-20 x 1" Hex Head Screw  
Inlet Flange, 1-1/2" Female NPT  
Inlet Flange, 2" Male NPT  
Inlet Flange, 1-1/2" Female BSPT  
Inlet Flange, 2" Male BSPT  
2" Duckbill Valve, EPDM (Black)  
2" Duckbill Valve, Nitrile (Red)  
Valve Housing  
Valve Housing Elbow  
M Pump Body  
M Pump Base Mounting Bracket  
1/4"-20 x 3/4" Hex Head Screw  
1/4" NPT Brass Plug  
Outlet Flange, 1-1/2" Female NPT  
Outlet Flange, 2" Male NPT  
Outlet Flange, 1-1/2" Female BSPT  
Outlet Flange, 2" Male BSPT  
1/2"-13 x 1-1/4" Hex Head Screw  
3/8"-16 x 1-1/2" Hex Head Screw  
3/8" Split Ring Lock Washer  
Motor, 115/230VAC, 60Hz, TEFC  
Motor, 115/230VAC, 50Hz, TEFC  
Motor, 115/230VAC, 60Hz, Explosion-Proof  
Motor, 115/230VAC, 50Hz, Explosion-Proof  
Motor, 12VDC  
21  
22  
4
2
23  
24  
25  
26  
27  
1
1
4
1
1
28  
29  
30  
31  
1
4
8
1
341188  
340918  
341765  
342772  
341146  
341127  
341118  
342771  
342465  
342699  
342773  
342775  
342776  
342777  
Motor, 24VDC  
Motor, 32VDC  
1PSI Pressure Vent  
32  
33  
34  
35  
36  
340707  
1
4
6
6
6
3/8"-16 x 1" Hex Head Screw  
5/16" External Lock Washer  
5/16"-18 x 1" Hex Nut  
347773  
342761  
342760  
342762  
5/16" Flat Washer  
11  
 
MANUFACTURER’S ONE-YEAR LIMITED WARRANTY  
SeaLand warrants to the original purchaser only, that this product, if used for personal, family or household purposes, is  
free from defects in material and workmanship for a period of one year from the date of purchase.  
If this SeaLand product is placed in commercial or business use, it will be warranted, to the original purchaser only, to be  
free of defects in material and workmanship for a period of ninety (90) days from the date of purchase.  
SeaLand reserves the right to replace or repair any part of this product that proves, upon inspection by SeaLand, to be  
defective in material or workmanship. All labor and transportation costs or charges incidental to warranty service are to be  
borne by the purchaser-user.  
EXCLUSIONS  
IN NO EVENT SHALL SEALAND BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, FOR DAMAGES  
RESULTING FROM IMPROPER INSTALLATION, OR FOR DAMAGES CAUSED BY NEGLECT, ABUSE,ALTERATION OR  
USE OF UNAUTHORIZED COMPONENTS. ALL IMPLIED WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF  
MERCHANTABILITY OR FITNESS FORANY PARTICULAR PURPOSE, ARE LIMITED TOAPERIOD OF ONE YEAR FROM  
DATE OF PURCHASE.  
IMPLIED WARRANTIES  
No person is authorized to change, add to, or create any warranty or obligation other than that set forth herein.  
Implied warranties, including those of merchantability and fitness for a particular purpose, are limited to one (1) year from  
the date of purchase for products used for personal, family or household purposes, and ninety (90) days from the date of  
purchase for products placed in commercial or business use.  
OTHERRIGHTS  
Some states do not allow limitations on the duration of an implied warranty and some states do not allow exclusions or  
limitations regarding incidental or consequential damages; so, the above limitations may not apply to you. This warranty  
gives you specific legal rights and you may have other rights which may vary form state to state.  
To obtain warranty service, first contact your local dealer from whom you purchased this product.  
The first choice in marine and RV sanitation.  
Dometic Corporation  
13128 State Rt 226, PO Box 38, Big Prairie, OH 44611-0038 USA  
SeaLand Customer Service  
1-800-321-9886  
330-496-3211 (8:00 a.m.-5:00 p.m. ET)  
Fax: 330-496-3097  
® Registered; ™ Trademark of Dometic Corporation.  
© 2002 Dometic Corporation  
342695 2/02  
 

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