Smartgen HT40MA User manual

HT40MA
ENGINE WATER HEATER
USER MANUAL

Chinese trademark
English trademark
SmartGen —make your generator smart
SmartGen Technology Co., Ltd.
No.28 Jinsuo Road, Zhengzhou, Henan Province, China
Tel: [phone]
[phone](overseas)
Fax: [phone]
Email: [e-mail]
Web: www.smartgen.com.cn
www.smartgen.cn
All rights reserved. No part of this publication may be reproduced in any material form (including
photocopying or storing in any medium by electronic means or other) without the written permission of
the copyright holder.
Applications for the copyright holder’s written permission to reproduce any part of this publication
should be addressed to Smartgen Technology at the address above.
Any reference to trademarked product names used within this publication is owned by their respective
companies.
SmartGen Technology reserves the right to change the contents of this document without prior notice.
Table 1 –Software Version
Date
Version
Note
2021-12-22
1.0
Original release.
2022-04-24
1.1
Change the holders and packing list; add maintenance
instruction.
2022-07-20
1.2
Modify the drain screw.

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CONTENTS
1 OVERVIEW...................................................................................................................................... …….4
2 PERFORMANCE AND CHARACTERISTICS......................................................................................... 4
3 TECHNICAL PARAMETERS................................................................................................................. 5
4 PANEL INDICATION............................................................................................................................. 6
5 CONNECTIONS .................................................................................................................................... 6
6 INSTALLATION INSTRUCTION ........................................................................................................... 7
7 OPERATION........................................................................................................................................ 10
7.1 COMMISSIONING.................................................................................................................... 10
7.2 OVERHEAT PROTECTION RESET........................................................................................... 10
8 CAUTIONS AND FAULT SOLUTIONS................................................................................................ 11
9 CASE AND INSTALLATION DIMENSIONS........................................................................................ 12
10 PACKING LIST.................................................................................................................................... 12

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1OVERVIEW
HT40MA Water Heater enables wide application on various engine coolant pre-heating. It has fine
cast aluminum enclosure and self-extinguishing engineering plastics end closure, easy and convenient
to use.
If the ambient temperature is lower than 4ºC during cranking, engine coolant and lubricant may
condense into solid state and lose their lubricating and cooling properties, which can damage the
engine. Therefore, engine heater should be installed to ensure normal starting and running of the engine
when the ambient temperature is lower than 4ºC.
The inner heating pipe and end cover both adopt stainless steel with high corrosion resistance. The
heater has light indication function, which can indicate power and heating status. 3 kinds of heaters
with different heating temperature are optional (Standard heater: 40ºC; 50ºC and 60ºC heaters are
needed to be customized).
This product is suitable for various engines with (13~25) L displacement.
Please login our company's official website to select heaters.
2PERFORMANCE AND CHARACTERISTICS
——Fine cast aluminum enclosure, stainless steel inner pipes and sealed end closure;
——Coolant temperature is controlled by thermostat which is installed within the heater. It has
simple structure and high reliability;
——Power, heating and overheat protection light indicators make it easy to observe the heater
status;
——Both of the two water inlets have one-way inlet valve and they sit on either side of the heater;
Users can choose any one to use during installation;
——Both of the two power line inlets are knock-off design; Users can choose suitable one to use
according to the installation way. Waterproof joints (stuffing box) are provided;
——There is a water drain valve with seal ring on the bottom of the heater so as to be used when
needed;
——Overheating thermostat provides the protection of dry heating and overheating;
——Press Test key to test-run the unit when ambient temperature is over high;
——This product can work normally at -40ºC temperature.

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3TECHNICAL PARAMETERS
Table 2 –HT40MA Specification
Item
Content
Model
HT40MA
Rated Power
4000W
Rated Voltage
AC240V
Operating Voltage
AC190V~AC277V
Rated Current
16.7A
Engine Displacement
(13~25)L
Thermostat Switch Range
HT40MA: Off: (40±3)ºC Reset: (25±5)ºC
HT40MA-1: Off: (50±3)ºC Reset: (35±5)ºC
HT40MA-2: Off: (60±3)ºC Reset: (45±5)ºC
Overheating Switch Range
Off: (95±4)ºC Manual Reset: (temperature below 80ºC)
Insulating Resistance
≥50MΩ
Electrical Strength
AC 1.5kV 1min, ≤2.5mA
Inlet/Outlet Size
3/4″(φ19mm)
Max. Water Pressure
0.5MPa
Protection Level
IP54
Vibration Resistance
(5~8)Hz; Amplitude±7.5mm; Triaxial
(8~500)Hz; a=2g; Triaxial
Shock Resistance
Half-sine wave; apeak=50g; Triaxial
Working Temperature
-40ºC~+70ºC
Storage Temperature
-40ºC~+70ºC
Case Dimensions
445mm×375mm×210mm
Weight (include accessories)
5.6kg

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4PANEL INDICATION
Fig.1 –Panel Indication
5CONNECTIONS
Fig.2 –Wire Connection
Install the water-proof connection joint after knock on the knock-off hole which on the rear plastic
shell. Pass the 4mm2 power line through the thread hole of rear shell to connect to L, N, E terminals
respectively.

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Fig.3 –Connection Position
6INSTALLATION INSTRUCTION
Please install the heater vertically according to the diagram before use. Paying attention to
direction of heater inlet and outlet, and ensure that the heater position is below the lowest water level of
the engine and that all the air is exhausted out of the heater and it is topped off with coolant.
Fig.4 –Operation Diagram

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Fig.5 –Installation Position Diagram
Fig.6 –Incorrect Pipe Connection Methods
NOTE: If there is a W-shaped bend or reverse U-shaped bend during pipe connection, the air
accumulated in the pipe cannot be discharged normally, resulting in the liquid cannot be circulated
properly. The air dissolved in the liquid will be precipitated during heating and retained in the bend, so
on the condition of unsmoothed pipeline, even if by the manual exhaust, it will repeat in the next
heating process of air collection. To ensure that the smooth liquid circulation, the hosepipe with an
inner diameter of more than 20mm and pipe joints with an inner diameter of more than 15mm should
be selected.

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Fig.7 –Installation Method Diagram
As shown in Fig.7, the holder(Right) must be installed at the water outlet end of the heater, and the
installation plane should be kept as level as possible.

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Fig.8 –Assembly Structure
7OPERATION
7.1 COMMISSIONING
If heater doesn’t work and overheat indicator doesn’t light on, users can force heater to work by
pressing test key.
7.2 OVERHEAT PROTECTION RESET
When overheat alarm indicator lights on, heater will enter into overheat protection status and
stop heating. If heater temperature falls below the reset temperature limit of overheat protection
thermostat (80ºC), heater enters into auto mode again.

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8CAUTIONS AND FAULT SOLUTIONS
Before starting the machine, ensure that all the air is exhausted out of the heater and it is topped
off with coolant. If water is used, please drain it off when ambient temperature is lower than 0ºC.
Otherwise, the remaining water will freeze, resulting in heater break. Using tap water or river water will
scale the surface of heating pipe and shorten the using life of the heater.
Corresponding antifreeze is recommended.
Heat resisting power line is recommended.
Earth line must be soundly connected to earth.
Drain valve: Can be opened or closed using hexagonal tools.
Unit: mm
Fig.9 –Drain Screw
Common Faults and Solutions:
1. Overheat protection:
a. Check the valve to assure whether it is opened and whether the heater is full of water;
b. Check whether the hosepipe has an obvious W-shaped or reverse U-shaped trend, and whether
there is an obvious hot and cold alternating area;
Solutions: Shorten the hosepipe length and optimize the hosepipe trend;
2. High water outlet temperature: under normal circumstances, the outlet temperature is about 70℃.
It occurs when the hosepipe is too long, both the inner diameter of the hosepipe and the inner
diameter of the fitting joints are too small, as well as the water flow is not smooth so that the heat
cannot be transferred properly.
Solutions: Shorten the hosepipe length, using the hose with an inner diameter of more than 20mm,
and the connectors with an inner diameter of more than 15mm.
3. Unable to reach the preheating temperature:
a. The heater power is not enough;
b. The cable of the power supply is too long and result in dividing resistance of the cable;
Solutions:
1. Replace the heater whose power matches the engine;
2. Shorten the power cable as possible and increase the cable diameter.

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9CASE AND INSTALLATION DIMENSIONS
Unit: mm
Fig.10 –Overall Dimensions
10 PACKING LIST
Table 3 –Packing List
No.
Name & Model
Quantity
1
Heater
1
2
Holder (left)
1
3
Holder (right)
1
4
U-shape steel belt
2
5
Seal ring
2
6
Flat gasket ( stainless steel) GB/T 95 8
8
7
Spring washer GB/T 93 8
8
8
Hexagon nut (stainless steel) GB/T 6170 M8
8
9
Hexagon bolt (full thread stainless steel) GB/T 5783
M8×25
6
10
Hexagon bolt (stainless steel) GB/T 5783 M8x40
2
11
Rotary joint (Inlet)
1
12
Pagoda joint (Outlet)
1
13
Water-proof cable joint
1
14
User manual
1
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