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Figure 43 – Position The Thermo-
stat Sensing Bulb In The Vertical
Position With Capillary at The
Bottom
CHECKING SYSTEM OPERA-
TION
The millivolt system and individual
components may be checked with
a millivolt meter having a 0-1000 mV
range. Conduct each check shown
in chart below by connecting meter
test leads to terminals as indicated.
TECHNICAL SERVICE
You may have further questions about installation,
operation, or troubleshooting. If so, contact PRO-COM's
800# on the front page of the manual.
ACCESSORIES
Purchase these heater accessories from your lo-
cal dealer. If they can not supply these
accessories, contact your nearest Parts Central .
These parts are not currently available from PRO-
COM.
EQUIPMENT SHUTOFF VALVE
For all heater models. Equipment shutoff valve with
1/8" NPT tap and 1/2" NPT Pipe(see Figure 42).
REPLACEMENT PARTS
Note: Use only original replacement parts. This will pro
Input Rating
Gas Type
Manifold Pressure
Minimum Inlet Pressure
Maximum Inlet Pressure
.
CHECK
TEST
TO TEST
CONNECT
METER
LEADS TO
TERMINALS
THERMO-
STAT
CONTACTS
METER
READING
SHOULD BE
A. COMPLETE MILLIVOLT SYS
TEM CHECk
("A" Reading - Thermostat
contacts CLOSED - Control
Knob "O N" - M ain burner
should come ON)
a. If the reading is more than 100
millivolts and the automatic valve
still does not come on, replace
the control.
SPECIFICATIONS
WZN18MV
WZL18MV
(TL,HL)A
(TL,HL)A
32000BTU/Hr 32000BTU/Hr
Natural
LP/Propane
3"W.C.
8"W.C.
5"W.C.
11"W.C.
10.5"W.C.
14"W.C.
A
B
COMPLETE
THERMOPILE
SYSTEM
OUTPUT
2&3
1&2
CLOSED
OPEN
OPEN
CLOSED
tect your warranty coverage for parts replaced under
warranty.
PARTS UNDER WARRANTY
Contact authorized dealer from whom you purchased
this product. If they are unable to supply original
replacement part(s), call the number on front pageof
manual When contacting your dealer or PRO-COM,
have ready:
l
your name
l
your address
l
model and serial numbers of your heater
l
how heater was malfunctioning
l
type of gas used (natural or propane/LP gas)
l
purchase date
l
warranty card
Usually, we will ask you to return the defective part to
the factory.
WZN24MV
WZL24MV
(TL,HL)A
(TL,HL)A
34000BTU/Hr 34000BTU/Hr
Natural
,LP/Propane
3"W.C.
8"W.C.
5"W.C.
11"W.C.
10.5"W.C.
14"W.C.
20
b. If the closed circuit reading
("A" reading) is less than
100 millivolts, determine
cause for low reading,
proceed to Section B below.
B. Thermopile Output
Reading Check
("B" Reading - Thermostat
contacts OPEN- Main
burner OFF)
1. Check gas pressure to the unit.
If gas pressure is within mini-
mum and maximum on data
plate, then check pilot voltage,
325 millivolts minimum. If the
minimum millivolt reading is
not obtainable, replace pilot.
Figure 44 - Equipment Shutoff
Valve
WZN30MV
WZL30MV
(TL,HL)A
(TL,HL)A
40000BTU/Hr
40000BTU/Hr
Natural
,LP/Propane
3"W.C.
5"W.C.
10.5"W.C.
8"W.C.
11"W.C.
14"W.C
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