StantFin Monitron EH, Monitron EH EH8-135S, Monitron EH-40-135S, Monitron EH-12-345S, Monitron H-40-345S Operation And Installation Instructions Manual
MODEL EH ELECTRIC BOILER
EH8-135S through EH-40-135S 3 wire 120/208V, 120/240V single phase
EH-12-345S through EH-40-345S 4 wire 120/208V three phase WYE
OPERATION AND INSTALLATION INSTRUCTIONS
IMPORTANT:
This manual must be left with owner and should be hung
on or adjacent to the boiler for reference.
Publication No. EH-40
HG 10/08-10/08-2m Printed in Canada
Part No. 79-0820
Rev.B
Heating Contractor
Address
Phone Number
Boiler Model Number
Boiler Serial Number
Installation Date
CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .PAGE
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Air Eliminator and Expansion Tanks . . . . . . . . . . . . . . . . . . 2
Flow Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Wall Thermostat Flow Switch and Circulator . . . . . . . . . . . 2
Service Connections and Electrical Ratings . . . . . . . . . 3–4
Typical Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Typical Zone Valve Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Fill System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Air Elimination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Bypass Flow Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Check for Proper Boiler and System Operation . . . . . . . . 7
Operation (models equipped with seq. control system) . . . . . . 7
Periodic Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Appendix A & B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
DESCRIPTION
The Monitron boiler is a low pressure hot water heating electric
boiler. The heating elements are sheathed resistance type. The
heat exchanger is cast-iron. The heat exchanger is constructed,
inspected, and stamped in accordance with Section IV of the
American Society of Mechanical Engineers (ASME) Boiler and
Pressure Vessel Code. In addition, the Monitron Boiler is
equipped with a safety relief valve and an integral dual limit control, conforming to ASME requirements. The Monitron boiler is
CSA listed.
MOUNTING
The Monitron is intended for wall mounting, utilizing the wall
brackets attached to the boiler (see Figure 1). Allow sufficient
space for piping and service. The boiler may be installed in an
enclosed space (see Figure 1). The boiler must be INSTALLED
LEVEL.
PIPING
Air Separator and Expansion Tanks
The recommended piping arrangement is shown in figures 4
through 6. Note that there is a built-in air eliminator in the heat
exchanger (air vent, however, is by others). The air vent tapping is
13mm (1/2”). A bushing (by others) to suit the size of the air vent
thread is required. Additional air vents should be installed at
points just upstream from all drops in elevation of the piping
system (high points).
Relief Valve Discharge Piping
Use same size or larger piping than valve outlet. Must terminate
152mm ( 6”) minimum from floor with a plain ( no threads) end.
Place a bucket under pressure relief valve discharge. Make sure
discharge is always visible. DO NOT hard-pipe to drain piping.
Flow Switch
THE INSTALLATION OF A FLOW SWITCH IS STRONGLY
RECOM MENDED. It is intended to prevent the burnout of heater
elements should the circulator fail, or should air accumulate in
the boiler due to faulty air elimination (see Table 3 for flow switch
size required). FLOW SWITCH MUST BE INSTALLED IN HORIZONTAL POSITION. IF A FLOW SWITCH IS NOT USED JUMPER
THE “FF” TERMINALS (JUMPER NOT SUPPLIED.)
Bypass
The bypass shown must be set so that a sufficient amount of
water can circulate through the boiler when all zone valves are
closed. (See Figure 5 & 6.)
Multi-zone Balancing
Raise all zone thermostat settings and verify that all zone valves
are open (bypass valve should be closed). Close all electrical
panels. Turn on 15 amp control circuit breaker ONLY. Pump
should operate. Note the pressure reading on the pump discharge. Lower each zone thermostat setting to close corresponding zone valve. Adjust the corresponding balancing valve to
maintain pump discharge pressure. The pump discharge pressure should remain the same when all zones are in bypass or
when all zones are open or any combination of opened and
closed. (See Figure 5 & 6.)
WIRING
To wire the electric boiler, perform the following procedures:
1. Wall thermostat, flow switch, outdoor thermostat,
circulator and external transformer
All circuit breakers ahead of and at the boiler must be OFF.
Remove the Control Panel (left-hand front cover) by removing
5 screws from top, bottom and side flanges.
The centre compartment contains a 24V control terminal
board marked, "FF/TT/1-2" (see figure 2 or figure 3.)
Wire a 24V, two-wire heating thermostat or the auxiliary end
switch terminals from zone valves (see Figure 7) to "TT".
The "FF" terminals are for a flow switch.
Do not connect the wires to the flow switch "FF" terminals until
the by-pass flow adjustments are completed. Refer to "Bypass Flow Adjustment" (page 7) for wiring and adjustment
procedures. The flow switch wires should be taped at the boiler until they are to be connected to "FF".
The left compartment contains a 120V terminal board marked
"A-B/Circulator". Wire the circulator and connect wires and
conduit through the 13 mm (1/2") knockout (pro vided on the
bottom left hand corner of the cabinet) to the terminal board
"Circulator" terminals. These terminals supply 120 volts to the
circulator only when there is a call for heat.
2
NOTES:
1. MAY BE TOTALLY ENCLOSED.
2. ALL ABOVE CLEARANCE DIMENSIONS ARE MINIMUM.
3. ALL DIMENSIONS ARE IN METRIC (INCHES).
424mm
(16-11/16”)
475mm
(18-11/16”)
Figure 1. Boiler Mounting
Wire an external zone valve transformer to the "A-B" terminals if zone valves are used. These terminals provide a
constant 120 volts and can alternately be used to power the
circulator if constant circulation is desirable. Use 90°C (75°F)
minimum wire, copper or aluminum.
2. Service Connections and Electrical Ratings
A. All circuit breakers ahead of and at boiler must be OFF.
Remove the Service Connection Panel (right hand front)
cover by removing 5 screws from the top, bottom and
side flanges (see wiring diagram on back of the Service
Connection Panel and Figure 2 & 3).
B. Draw power feeder cable (90°C [75°F]minimum) and
conduit through service K.O. provided on side, top
or bottom.
C. Connect hot lines to main lugs on breaker base (S
models) or to black and red or to black, red and blue
leads (LB models) provided in service compartment. A
ground lead should be drawn and wired to the ground
lug in the service compartment. If rating plate indicates
boiler is a single phase 3-wire or 3-phase 4-wire model,
draw a neutral wire #12 AWG maximum, 90°C (75°F).
minimum and connect to neutral lug or white wire lead
provided in service compartment. See Tables 1 and 2 for
lug sizes and current ratings.
Main * Lug Grounding Lug Wire Size
Wire Size Small Holes Large Holes
Model Phase CU-AL† CU-AL† CU AL†
EH-40 1 2-250 MCM CU DO NOT USE 6-2/0
EH-28 thru 32 1 2-250 MCM DO NOT USE 14-4 6-4
EH-8 thru 24 1 6-2/0 14-8 14-4 6-4
EH-8 thru 40 3 6-2/0 14-8 14-4 6-4
Neutral Lug Wire Size: For 3-wire single phase and 4-wire 3 phase models
equipped with circuit breakers
Small Holes accommodate: #14-12 Solid CU or AL † and #12 stranded CU or AL†
Large Holes accommodate: #14-8 Solid CU, #10-4 Stranded CU and #6-4 AL †
The maximum wire size of the neutral should not exceed 12 AWG in order for 51 mm (2”)
conduit to accommodate incoming power feeder, plus the neutral wire and a ground conductor for the larger models.
Table 1. Lug Sizes
* For models with circuit breakers only.
† ALUMINUM conductors may be used, lug size, conduit size, ampacity and all applicable
codes permitting. However, aluminum conductors may NOT be used for model EH-40 single phase.
SINGLE PHASE 3 WIRE THREE PHASE, 4 WIRE
120/208V, 120/240V‡ 120/208V-WYE
CIRCUIT ONLY‡
Basic Heater Basic Heater
Model Amperes* Model Amperes†
No. @240V No. @208V
EH-8 33
EH-9 38
EH-10 42
EH-12 50 EH-12 25
EH-15 63
EH-16 67 EH-16 38†
EH-18 75
EH-20 83 EH-20 48†
EH-24 100 EH-24 60†
EH-25 104
EH-28 117 EH-28 60†
EH-30 125
EH-32 133 EH-32 73†
EH-35 146
EH-40 167 EH-40 95†
Table 2. Current Ratings
* For current values @ 208V, multiply current @ 240V by 0.867.
† Leg with the highest value of line current of an unbalanced 3-phase load.
‡ 125 VAC maximum rating of all hot conductors.
Flow Switch Minimum
Model McDonnell Pipe Length of
No. & Miller No. Size Straight Pipe*
mm in. mm in.
EH-40 FS8V 32 1-1/4 216 8-1/2
EH-8 thru
EH-35 FS4-3T3-1 25 1 165 6-1/2
Table 3. Flow Switch Size Selection
* Both upstream and downstream of flow switch
3
Loading...